WO2018190004A1 - Simulated gas leak image generation device and method, and gas sensing device - Google Patents

Abstract

Provided are a simulated gas leak image generation device, a simulated gas leak image generation method, and a gas sensing device comprising said simulated gas leak image generation device which, on the basis of a base image capturing a real-life object of imaging and a gas image capturing gas only, generate a simulated gas leak image, defined as an image simulating a gas leak involving the object of imaging.

Description

Pseudo-leakage gas image generation apparatus and method, and gas detection apparatus

The present invention includes a pseudo-leakage gas image generation device and a pseudo-leakage gas image generation method capable of generating an image (pseudo-leakage gas image) that simulates gas leakage with respect to an actual site, and the pseudo-leakage gas image generation device. The present invention relates to a gas detection device.

For example, a relatively large amount of gas is handled in gas plants, petrochemical plants, thermal power plants, and iron-related facilities. Since the gas leakage may lead to an accident, a gas detection device for detecting the gas leakage is often provided. One such gas detection device is disclosed in Patent Document 1, for example.

The gas leak detection apparatus disclosed in Patent Document 1 is an apparatus that detects gas leak in an inspection target area, and an image that processes an infrared image captured by the infrared camera and an infrared camera that captures the inspection target area. A processing unit, and the image processing unit includes a fluctuation extracting unit that extracts a dynamic fluctuation due to gas leakage from a plurality of infrared images arranged in time series. According to Patent Document 1, such a gas leak detection device includes the fluctuation extraction unit, and therefore, the situation where the luminance distribution of the inspection target region is uneven or the amount of gas leak is small. In addition, it is possible to accurately detect gas leakage.

Incidentally, like the gas leak detection device disclosed in Patent Document 1, a device using electromagnetic wave absorption (for example, infrared absorption) by gas emits from a background object having an absolute temperature of 0 [K] or higher (black body radiation). The presence / absence of gas is detected by detecting the amount of electromagnetic wave change that is mainly caused by absorption of electromagnetic waves in the infrared region by gas or by the gas itself emitting black body radiation. . The amount of change in the electromagnetic wave depends on parameters such as the temperature of the background object, emissivity, external illumination (sunlight, etc.), gas temperature, etc. in addition to the gas leakage scale (gas concentration, gas thickness). For this reason, in order to verify the effectiveness of the apparatus, in the target area where gas leakage is monitored, the gas detectability (whether or not the gas leakage can be detected) with respect to the gas leakage is grasped in advance. This is very important.

If the device is used in a scene where gas is actually leaking in the target area, the gas detectability in the device can be verified, and the effectiveness of the device can be verified. However, since the target area is usually a place where there is a high possibility of causing an accident due to gas leakage, it is difficult to actually leak gas, and thus it is difficult to verify the effectiveness of the device. .

JP 2012-58093 A

The present invention has been made in view of the above-described circumstances, and its purpose is to provide an image (pseudo-leakage) that simulates gas leakage with respect to an actual site, which can be suitably used for verification of the effectiveness of the gas detection device. A pseudo leak gas image generation device and a pseudo leak gas image generation method capable of generating a gas image), and a gas detection device including the pseudo leak gas image generation device.

In order to achieve the above-described object, a pseudo leak gas image generation device, a pseudo leak gas image generation method, and a gas detection device that reflect one aspect of the present invention include a base image obtained by imaging an actual subject, and only a gas. Based on these gas images, an image simulating the leakage of the gas to the subject is generated as a pseudo-leakage gas image.

The advantages and features afforded by one or more embodiments of the invention will be more fully understood from the detailed description and accompanying drawings provided below. The detailed description and the accompanying drawings are given by way of example only and are not intended as a definition of the limitations of the invention.

It is a block diagram which shows the structure of the pseudo | simulation leak gas image generation apparatus in 1st Embodiment. It is a figure which shows the structure of the gas image information table memorize | stored in the said pseudo | simulation leak gas image generation apparatus. It is a flowchart which shows operation | movement of the said pseudo | simulation leak gas image generation apparatus. As an example, it is a figure which shows the base image and gas image which are used with the said pseudo | simulation leak gas image generation apparatus. It is a figure which shows the 1st intermediate | middle gas image calculated | required from the gas image shown in FIG. 4, and a light transmittance image. It is a figure which shows the pseudo | simulation leak gas image produced | generated from the base image and gas image which are shown in FIG. It is a figure which shows the relationship between a density thickness product and a light absorption rate. It is a block diagram which shows the structure of the gas detection apparatus in 2nd Embodiment. It is a figure which shows the input screen displayed on the said gas detection apparatus as an example. It is a flowchart which shows operation | movement of the said gas detection apparatus. 11 is a flowchart illustrating a gas detection operation in each of a normal operation and a detectability verification operation in the flowchart illustrated in FIG. 10. It is a figure for demonstrating the process of time averaging in the flowchart shown in FIG. It is a figure for demonstrating the difference process in the flowchart shown in FIG. It is a figure for demonstrating the calculation process of the standard deviation in the flowchart shown in FIG. It is a figure for demonstrating the determination process of the gas leak in the flowchart shown in FIG. It is a figure for demonstrating each arrangement | positioning method of the flame | frame in the 1st thru | or 3rd aspect in the gas detection operation | movement in the said detection property verification operation | movement.

Hereinafter, one or more embodiments of the present invention will be described with reference to the drawings. However, the scope of the invention is not limited to the disclosed embodiments. In addition, the structure which attached | subjected the same code | symbol in each figure shows that it is the same structure, The description is abbreviate | omitted suitably. In this specification, when referring generically, it shows with the reference symbol which abbreviate | omitted the suffix, and when referring to an individual structure, it shows with the reference symbol which attached the suffix.

(First embodiment)
FIG. 1 is a block diagram illustrating a configuration of a pseudo leak gas image generation apparatus according to the first embodiment. FIG. 2 is a diagram showing a configuration of a gas image information table stored in the pseudo leak gas image generation apparatus.

The pseudo-leakage gas image generation apparatus according to the present embodiment is an apparatus that generates an image that looks as if the gas has leaked to a subject that does not actually leak gas. A pseudo-leakage gas image generation unit that generates an image (pseudo-leakage gas image) that simulates the leakage of the gas to the subject based on an image) and an image containing only gas (gas image). More specifically, the pseudo leak gas image generation device D includes, for example, as shown in FIG. 1, an image acquisition unit 1, an input unit 2, an output unit 3, a control processing unit 4, and a storage unit 5. Is provided.

The image acquisition unit 1 is an apparatus that is connected to the control processing unit 4 and acquires a base image obtained by capturing an actual subject under the control of the control processing unit 4. Such an image acquisition unit 1 may be an imaging unit that generates a base image by imaging a real subject and outputs the generated base image to the control processing unit 4, for example. For example, the image acquisition unit 1 may be a communication interface unit (communication IF unit) that receives transmission of a base image from a server device that stores and manages the base image via a communication line (communication network, network). For example, the image acquisition unit 1 may be an interface unit (IF unit) that reads a base image from an external device that stores the base image.

The imaging unit as an example of such an image acquisition unit 1 is an apparatus that generates an image of infrared light, for example, because the presence or absence of gas is detected by infrared light. More specifically, the imaging unit is, for example, an imaging optical system that forms an infrared optical image of a subject on a predetermined imaging surface, and a light receiving surface that is aligned with the imaging surface, An area image sensor that converts an infrared optical image of the subject into an electrical signal, and an image (image data) that is data representing an infrared image of the subject by performing image processing on the output of the area image sensor A digital infrared camera or the like provided with an image processing circuit or the like that generates a base image (base image data).

The communication IF unit as an example of the image acquisition unit 1 transmits, for example, a communication signal (for example, a communication signal for requesting transmission of a base image) containing data to be transferred input from the control processing unit 4 to a communication line. The communication signal is generated according to the communication protocol used in the transmission, and the generated communication signal is transmitted to the server device via the communication line, and the communication signal (for example, a communication signal containing a base image, etc. ), The data is extracted from the received communication signal, and the extracted data is converted into data in a format that can be processed by the control processing unit 4 and output to the control processing unit 4. Such a communication IF unit is, for example, a data communication card, a communication interface circuit according to the IEEE 802.11 standard, or the like.

The IF unit as an example of the image acquisition unit 1 is a circuit that inputs and outputs data with an external device, for example, an RS-232C interface circuit that is a serial communication method, Bluetooth (registered trademark), and the like. An interface circuit using a standard, an interface circuit that performs infrared communication such as an IrDA (Infrared Data Association) standard, and an interface circuit that uses a USB (Universal Serial Bus) standard.

The input unit 2 is connected to the control processing unit 4 and generates various commands such as a command for instructing generation of a pseudo-leakage gas image and a pseudo-leakage gas image such as input of processing conditions to be described later. A device that inputs various necessary data to the pseudo leak gas image generation device D, such as a plurality of input switches, a keyboard, a mouse, and the like assigned with predetermined functions. In the present embodiment, the input unit 2 functions as an example of a processing condition receiving unit that receives a predetermined processing condition for processing a gas image. The processing conditions include at least one of a concentration thickness product, a leakage direction, a leakage range, a leakage position, and a temperature in the gas. The said leak position is a position where the said gas leaks from the accommodating body (for example, tank, piping, etc.) which accommodates gas. The leak range is an area where gas leaked from the container (leakage gas) is leaking. The leakage direction is a main direction in which the leakage gas flows. The output unit 3 is connected to the control processing unit 4, and according to the control of the control processing unit 4, commands and data input from the input unit 2, and the pseudo-leakage gas image generated by the pseudo-leakage gas image generation device D For example, a display unit (display device) such as a CRT display, an LCD (liquid crystal display device) and an organic EL display, a printing device such as a printer, a communication IF unit, an IF unit, etc. .

A touch panel may be configured from the input unit 2 and the output unit 3. In the case of configuring the touch panel, the input unit 2 is a position input device that detects and inputs an operation position such as a resistive film method or a capacitance method, and the output unit 3 is a display device. In this touch panel, a position input device is provided on the display surface of the display device, one or more input content candidates that can be input to the display device are displayed, and the user touches the display position where the input content to be input is displayed. The position is detected by the position input device, and the display content displayed at the detected position is input to the pseudo leak gas image generation device D as the operation input content of the user. In such a touch panel, since the user can easily understand the input operation intuitively, the pseudo leak gas image generation device D that is easy for the user to handle is provided.

The storage unit 5 is a circuit that is connected to the control processing unit 4 and stores various predetermined programs and various predetermined data under the control of the control processing unit 4.

The various predetermined programs include, for example, a control program for controlling each of the units 1 to 3 and 5 of the pseudo-leakage gas image generation apparatus D according to the function of each unit, and an input as an example of the processing condition receiving unit. Control processing programs such as an image processing program that processes a gas image under the processing conditions received by the unit 2 and a pseudo leak gas image generation program that generates a pseudo leak gas image based on a base image and a gas image are included. The image processing program includes an enlargement / reduction processing program for enlarging or reducing a gas image according to a leakage range as an example of processing conditions, and a rotation for rotating a gas image according to a leakage direction as another example of processing conditions. Concentration processing program for increasing / decreasing (adjusting) the gas concentration thickness product of the gas image according to the processing program and the concentration thickness product as another example of the processing condition, and the gas image according to the temperature as another example of the processing condition When the gas position of the gas image is moved according to the temperature processing program for increasing / decreasing (adjusting) the gas temperature and the leak position as another example of the processing conditions, the plurality of leak positions Each of them includes a moving copy processing program for copying the gas of the gas image. In the pseudo leak gas image generation program, for each pixel of the gas image, a first intermediate image generation program for generating a first intermediate gas image by multiplying a pixel value of the pixel by a predetermined black body radiance equivalent value Alternatively, for each pixel of the gas image, the gas light transmittance image is obtained by subtracting the pixel value of the pixel from the maximum pixel value that can be taken by the pixel value corresponding to the numerical value “1” meaning complete transmission. A second intermediate image generation program for generating a second intermediate gas image by multiplying a base image by a light transmittance image of the gas generated by the transmittance image generation program, The pseudo leak gas image is generated by adding the first and second intermediate gas images generated by the first and second intermediate image generation programs, respectively. An image generating program and the like.

The black body radiance equivalent value P is a black body radiance having a temperature corresponding to the temperature T [K], and a sensitivity characteristic of an imaging device (imaging unit) that generates a base image on which a gas image is superimposed. This is a value corrected by (total sensitivity of the imaging optical system and area image sensor) and is given by the following equation (1).

ここで、Ｂ，ＲおよびＤは、ベース画像を生成する撮像装置（撮像部）によって決定される定数である。これら定数Ｂ、ＲおよびＤは、互いに異なる複数の温度で黒体炉を前記撮像装置（前記撮像部）で撮像することによって適宜に設定される。

Here, B, R, and D are constants determined by the imaging device (imaging unit) that generates the base image. These constants B, R, and D are appropriately set by imaging a black body furnace with the imaging device (the imaging unit) at a plurality of different temperatures.

The various predetermined data includes data necessary for executing each program such as a base image and a gas image. The storage unit 5 includes, for example, a ROM (Read Only Memory) that is a nonvolatile storage element, an EEPROM (Electrically Erasable Programmable Read Only Memory) that is a rewritable nonvolatile storage element, and the like. The storage unit 5 includes a RAM (Random Access Memory) that serves as a working memory of the so-called control processing unit 4 that stores data generated during execution of the predetermined program. The storage unit 5 functionally includes a base image storage unit 51 and a gas image storage unit 52 in order to store the base image and the gas image.

The base image storage unit 51 stores one or a plurality of base images acquired by the image acquisition unit 1. When the base image storage unit 51 stores a plurality of base images, when generating the pseudo leak gas image, for example, the plurality of base images stored in the base image storage unit 51 are so-called thumbnails in the output unit 3. The input unit 2 receives an input operation of selection by the user (operator), and one of the plurality of base images is designated (selected) as a target image for generating a pseudo leak gas image. By storing a plurality of base images in advance, the pseudo leak gas image generation device D can generate a pseudo leak gas image for a subject in various environments (conditions).

The gas image information storage unit 52 stores one or a plurality of gas images in which only gas is copied. When the gas image information storage unit 52 stores a plurality of gas images, when generating a pseudo leak gas image, for example, a plurality of gas images stored in the gas image information storage unit 52 are stored as described above. A gas that is output to the output unit 3 as a so-called thumbnail and is used when the input unit 2 accepts an input operation of selection by a user (operator) and one of the plurality of gas images generates a pseudo leak gas image. Designated (selected) as an image. By storing a plurality of gas images in advance, the pseudo-leakage gas image generation device D can store gas images corresponding to various wind directions, wind speeds, and concentration / thickness products, making it easier to perform various pseudo-leakage gas images. Therefore, by using such various pseudo leak gas images, the detectability in various situations can be verified and the effectiveness can be verified for the gas detector. The gas image can be generated, for example, by fluid simulation using various techniques of numerical fluid dynamics. Examples of the various methods include a finite element method and a particle method. In this embodiment, the gas image information storage unit 52 further stores predetermined attribute information of the gas image necessary for processing the gas image under the processing conditions in association with the gas image. The attribute information is appropriately set according to the processing conditions, and includes, for example, an image number (image ID), a leakage flow rate, a leakage direction, a wind speed, and a wind direction. These gas images and their attribute information are appropriately referred to as “gas image information”. In this embodiment, the gas image information is stored in the gas image information storage unit 52 in a table format. For example, as shown in FIG. 2, the gas image information table GT for registering the gas image information includes a gas image field (image file name field) for registering the gas image or a file name (image file name) of the gas image. 522, an image number field 521 for registering an image number which is a serial number assigned to the gas image registered in the gas image field 522, and a gas leakage flow rate in the gas image registered in the gas image field 522 are registered. The leakage flow field 523, the leakage direction field 524 for registering the gas leakage direction in the gas image registered in the gas image field 522, and the wind blowing against the gas in the gas image registered in the gas image field 522 A wind speed field 525 for registering the wind speed and a gas image fee And a wind direction field 526 for registering the wind direction of the wind blowing against the gas in the registered gas image to de 522 includes a record for each gas image. In this embodiment, a gas image is stored in the gas image information storage unit 52 with an image file name, and the image file name is registered in the gas image field. The leakage flow rate is expressed in units of [L / sec], the leakage direction is expressed in a clockwise angle with reference to the vertical upward direction of the gas image (0 [degrees]), and the wind speed is [m / sec]. Expressed in units, the wind direction is expressed as a clockwise angle with the vertical upward direction of the gas image as a reference (0 [degrees]).

Returning to FIG. 1, the control processing unit 4 is a circuit for controlling the units 1 to 3 and 5 of the pseudo-leakage gas image generation device D according to the function of each unit and generating a pseudo-leakage gas image. . The control processing unit 4 includes, for example, a CPU (Central Processing Unit) and its peripheral circuits. The control processing unit 4 functionally includes a control unit 41, an image processing unit 42, and a pseudo leak gas image generation unit 43 by executing the control processing program. The image processing unit 42 is an enlargement / reduction processing unit 421. , A rotation processing unit 422, a density processing unit 423, a temperature processing unit 424, and a moving copy processing unit 425. The pseudo leak gas image generation unit 43 includes a first intermediate image generation unit 431 and a transmittance image generation unit 432. The second intermediate image generation unit 433 and the pseudo image generation unit 434 are functionally provided.

The control unit 41 controls each part 1 to 3 and 5 of the pseudo leak gas image generation apparatus D according to the function of each part, and controls the entire pseudo leak gas image generation apparatus D.

The image processing unit 42 processes a gas image under the processing conditions received by the input unit 2 as an example of the processing condition receiving unit. The enlargement / reduction processing unit 421 enlarges or reduces the gas image according to the leakage range as an example of the processing conditions. The rotation processing unit rotates the gas image according to the leakage direction as another example of the processing conditions. The density processing unit 423 increases / decreases (adjusts) the gas concentration / thickness product of the gas image according to the density / thickness product as another example of the processing conditions. The temperature processing unit 424 increases or decreases (adjusts) the gas temperature of the gas image according to the temperature as another example of the processing conditions. The moving copy processing unit 425 moves the gas position of the gas image in accordance with the leakage position as another example of the processing conditions. When there are a plurality of leakage positions, the gas image gas is supplied to each of the plurality of leakage positions. It is to be copied.

The pseudo leak gas image generation unit 43 generates a pseudo leak gas image based on the base image and the gas image. The first intermediate image generation unit 431 generates a first intermediate gas image for each pixel of the gas image by multiplying the pixel value of the pixel by a predetermined black body radiance equivalent value. For each pixel of the gas image, the transmittance image generation unit 432 subtracts the pixel value of the pixel from the maximum pixel value that can be taken by the pixel value corresponding to the numerical value “1” meaning complete transmission. A gas light transmittance image is generated. The second intermediate image generation unit 433 generates a second intermediate gas image by multiplying the base image by the light transmittance image of the gas generated by the transmittance image generation unit 432. The pseudo image generation unit 434 generates a pseudo leak gas image by adding the first and second intermediate gas images generated by the first and second intermediate image generation units 431 and 433, respectively.

Next, the operation of this embodiment will be described. FIG. 3 is a flowchart showing the operation of the pseudo leak gas image generation apparatus. FIG. 4 is a diagram showing a base image and a gas image used in the pseudo leak gas image generation apparatus as an example. FIG. 4A shows an example of a base image, and FIG. 4B shows an example of a gas image. FIG. 5 is a diagram showing a first intermediate gas image and a light transmittance image obtained from the gas image shown in FIG. FIG. 5A shows a first intermediate gas image obtained from the gas image shown in FIG. 4B, and FIG. 5B shows a light transmittance image obtained from the gas image shown in FIG. 4B. FIG. 6 is a diagram showing a pseudo leak gas image generated from the base image and the gas image shown in FIG. FIG. 7 is a diagram showing the relationship between the concentration thickness product and the light absorption rate. FIG. 7A shows the relationship between the concentration thickness product and the light absorption rate in methane gas, FIG. 7B shows the relationship between the concentration thickness product and the light absorption rate in propane gas, and FIG. 7C shows the concentration in ethylene gas. The relationship between the thickness product and the light absorption rate is shown, and FIG. 7D shows the relationship between the concentration thickness product and the light absorption rate in isobutane gas.

When the power supply is turned on, the pseudo leak gas image generating apparatus D having such a configuration executes necessary initialization and starts its operation. By executing the control processing program, the control processing unit 4 includes a control unit 41, an image processing unit 42, and a pseudo-leakage gas image generation unit 43. The image processing unit 42 includes an enlargement / reduction processing unit 421. The rotation processing unit 422, the density processing unit 423, and the moving copy processing unit 425 are functionally configured. The pseudo leak gas image generation unit 43 includes a first intermediate image generation unit 431, a transmittance image generation unit 432, and a second. The intermediate image generation unit 433 and the pseudo image generation unit 434 are functionally configured.

Then, in the generation of the pseudo leak gas image, in FIG. 3, the pseudo leak gas image generation device D first acquires the base image or accepts the selection of the base image by the control processing unit 4 (S11). For example, the control processing unit 4 generates and acquires a base image by imaging an actual predetermined subject by the image acquisition unit 1, and stores the acquired base image in the base image storage unit 51 of the storage unit 5. To do. From the viewpoint of verifying the effectiveness of the gas detection device, the predetermined subject is preferably a target region for detecting a gas leak when there is no gas leak, and the base image is such a target region. It is preferable that the target image is generated by imaging. For example, the control processing unit 4 downloads a base image from the server device by the image acquisition unit 1 and stores the base image in the base image storage unit 51. Further, for example, the pseudo leak gas image generation device D reads a base image from, for example, a so-called USB memory by the image acquisition unit 1 and stores it in the base image storage unit 51. Alternatively, as described above, the control processing unit 4 outputs the base image acquired by the image acquisition unit 1 and stored in advance in the base image storage unit 51 to the output unit 3, and performs an input operation of selection by the user (operator). The input unit 2 accepts the selection of the base image. In this specific example, in step S11, the target image generated by imaging the target region illustrated in FIG. 4A is acquired or selected as the base image BP. In the base image BP shown in FIG. 4A, a plant having a plurality of pipes and the like is reflected.

Next, the pseudo leak gas image generation device D receives a gas image selection by the control processing unit 4 (S12). More specifically, as described above, the control processing unit 4 outputs a gas image stored in advance in the gas image storage unit 52 to the output unit 3 and receives an input operation of selection by the user at the input unit 2. The selection of the gas image is accepted. According to this processing S12, in one specific example, the gas light absorptivity image representing the gas spatial concentration thickness product distribution represented by the gas light absorptance shown in FIG. 4B is selected as the gas image GPa. In FIG. 4B, the leaked gas distributed so as to spread in a substantially conical shape obliquely upward from the lower side in the gas image is reflected. The light absorption of gas varies depending on the gas type. For example, hydrocarbon gas such as methane gas, propane gas, ethylene gas and isobutane gas absorbs infrared light at the wavelength of the absorption line corresponding to the gas type. For example, hydrogen gas absorbs ultraviolet light at the wavelength of its absorption line. Note that the order of execution of the processing S11 and the processing S12 may be interchanged.

Next, the pseudo-leakage gas image generation device D receives the machining condition input by the input unit 2 by the control processing unit 4 by the input unit 2 (S13).

Next, the pseudo leak gas image generation device D processes the gas image by the image processing unit 42 of the control processing unit 4 under the processing conditions received in the processing S13 (S14). If processing conditions are not accepted in step S13, step S14 is skipped.

For example, in the process S13, when a gas leakage range is accepted as the processing condition, the gas range in the gas image (the range of the spatial concentration / thickness product distribution expressed by the light absorption rate) is different from the gas leakage range. In this case, the enlargement / reduction processing unit 421 of the image processing unit 42 sets the gas range in the gas image as a reference with respect to a predetermined pixel so that the gas range in the gas image matches the leakage range received as the processing condition ( A predetermined pixel is fixed) and enlarged or reduced by a known image processing. The predetermined pixel serving as the reference is, for example, a pixel corresponding to a leakage start position in the gas range of the gas image, a pixel corresponding to a barycentric position in the gas range of the gas image, or the like. Thereby, the leakage range can be arbitrarily set. Note that the actual leak gas range is the same depending on the distance from the imaging unit as an example of the image acquisition unit 1 to the leakage point, or depending on the distance from the imaging unit 11 of the gas detection device S described later to the leakage point. However, the leak range reflected in the image is different. For this reason, the distance may be set as a processing condition, and the enlargement / reduction processing unit 421 may enlarge or reduce the gas range in the gas image by known image processing according to the distance. Thereby, the distance can be arbitrarily set.

Further, for example, in the processing S13, when the gas leakage direction is received as the processing condition, the rotation processing unit of the image processing unit 42 is different when the gas leakage direction in the gas image is different from the leakage range received as the processing condition. 422 is a known image based on a predetermined pixel (with a predetermined pixel fixed) so that the gas leakage direction in the gas image matches the leakage direction received as a processing condition. Rotate by processing. Thereby, the leakage direction can be set arbitrarily.

Further, for example, in the processing S13, when the gas concentration / thickness product is received as the processing condition, the gas processing unit 42 determines that the gas concentration / thickness product in the gas image is different from the concentration / thickness product received as the processing condition. The concentration processing unit 423 processes (corrects or adjusts) the gas concentration / thickness product in the gas image so that the gas concentration / thickness product in the gas image matches the concentration / thickness product received as the processing condition. A gas image corresponding to the concentration thickness product received as a condition is generated. More specifically, the density processing unit 423 generates a gas image based on a first correspondence relationship between the light absorption rate and the concentration thickness product (first correspondence relationship between the pixel value representing the light absorption rate and the concentration thickness product). Then, each pixel value is converted into a gas concentration / thickness product image represented by a concentration / thickness product, and the converted gas concentration / thickness product image is compared with the concentration / thickness product received as a processing condition. When the thickness product and the concentration thickness product received as the processing condition are different, the concentration processing unit 423 makes the gas concentration thickness so that the concentration thickness product in the gas concentration thickness product image matches the concentration thickness product received as the processing condition. The density thickness product in the product image is processed, thereby generating a gas image corresponding to the density thickness product received as the processing condition. More specifically, for example, the density processing unit 423 compares the maximum density / thickness product in the converted density / thickness product image with the density / thickness product received as a processing condition, and compares the maximum density / thickness product and the processing in the gas density / thickness product image. When the concentration thickness product received as the condition is different, the first division result obtained by dividing the concentration thickness product received as the processing condition by the maximum concentration thickness product in the gas concentration thickness product image and each pixel in the gas concentration thickness product image The value is multiplied by the value, thereby processing (correcting or adjusting) the concentration / thickness product in the gas concentration / thickness product image. Then, the concentration processing unit 423 converts the gas concentration / thickness product image obtained by processing the concentration / thickness product in this way into a gas image represented by a pixel value representing a light absorption rate based on the first correspondence relationship, As a result, a gas image corresponding to the concentration / thickness product received as the processing condition is generated. Thus, the concentration thickness product can be set arbitrarily. Since the first correspondence relationship between the light absorption rate and the concentration thickness product varies depending on the gas type, it is prepared in advance according to the gas type. An example is shown in FIG. 7A shows the first correspondence of methane gas, FIG. 7B shows the first correspondence of propane gas, and FIG. 7C shows the first correspondence of ethylene gas. FIG. 7D shows the first correspondence relationship of isobutane gas. The horizontal axis of FIGS. 7A to 7D is the concentration thickness product expressed in units of [% · m], and the vertical axis is the light absorption rate. Since the light absorptance can range from 0 to 1, the range from 0 to 1 is assigned according to the number of bits of the pixel value. For example, when the pixel value is expressed by 8 bits, the range of 0 to 1 in the light absorption rate is assigned to each value of 0 to 255 in the pixel value (for example, the light absorption rate 0 is assigned to the pixel value 0, The light absorption factor 0.5 is assigned to the pixel value 127, and the light absorption factor 1 is assigned to the pixel value 255). Since the first correspondence relationship shown in FIG. 7 is non-linear, it is stored in the storage unit 5 as its approximate expression or conversion table. In the case of the conversion table, since it is a discrete value, a value not in the conversion table may be generated by numerical interpolation.

Also, for example, in process S13, when the gas temperature (gas temperature) is received as the processing condition, the temperature processing unit 424 of the image processing unit 42 matches the gas temperature in the gas image with the gas temperature received as the processing condition. As described above, the gas temperature in the gas image is processed (corrected or adjusted), thereby generating a gas image corresponding to the gas temperature received as the processing condition. More specifically, the temperature processing unit 424 substitutes the gas temperature T [K] received as the processing condition into the above-described equation (1) to obtain the blackbody radiance equivalent value P. Thereby, the gas temperature can be set arbitrarily.

Further, for example, in step S13, when a gas leakage position is received as the processing condition, the moving copy processing unit 425 of the image processing unit 42 sets the gas range in the gas image at the leakage position received as the processing condition. When there are a plurality of leakage positions that are moved and accepted as processing conditions, the gas range in the gas image is copied (copied) to each of the plurality of leakage positions. Thereby, the leakage position can be set arbitrarily.

When the base image is acquired or selected in this way, the gas image is selected, and the gas image is processed as necessary, the pseudo leak gas image generation device D then performs the pseudo leak of the control processing unit 4. For each pixel of the gas image, a first intermediate gas image is generated by multiplying the pixel value of the pixel by a predetermined black body radiance equivalent value by the first intermediate image in the gas image generation unit 43 (S15). When the gas temperature is not accepted as the processing condition in the process S13 and the black body radiance equivalent value P is not obtained in the process S14, the temperature T [K] of the base image (when the base image is generated) The black body radiance equivalent value P is obtained using the temperature T [K]). For example, the gas image GPa shown in FIG. 4B becomes the first intermediate gas image GPb shown in FIG. 5A by multiplying each pixel by the predetermined black body radiance equivalent value.

Next, the pseudo-leakage gas image generation device D uses the transmittance image generation unit 432 in the pseudo-leakage gas image generation unit 43 of the control processing unit 4 to set a numerical value “1” that means complete transmission for each pixel of the gas image. A gas light transmittance image is generated by subtracting the pixel value of the pixel from the corresponding maximum pixel value that the pixel value can take (S16). For example, when the pixel value is expressed by 8 bits, the pixel value of the pixel is subtracted from the maximum pixel value 255 corresponding to the numerical value “1” meaning complete transmission, thereby transmitting light of gas. A rate image is generated. For example, the gas image GPa shown in FIG. 4B becomes a gas transmittance image GPc shown in FIG. 5B by subtracting the pixel value of the pixel from the maximum pixel value for each pixel.

Next, the pseudo-leakage gas image generation device D uses the second intermediate image generation unit 433 in the pseudo-leakage gas image generation unit 43 of the control processing unit 4 to generate the light transmittance image of the gas generated by the transmittance image generation unit 432. Is multiplied by the base image to generate a second intermediate gas image (S17). For example, the pixel value of each pixel in the gas transmittance image GPc shown in FIG. 5B and the pixel value of each pixel in the base image BP shown in FIG. An image is generated.

Next, the pseudo-leakage gas image generation device D uses the pseudo-image generation unit 434 in the pseudo-leakage gas image generation unit 43 of the control processing unit 4 to perform the processing S15 and the processing in the first and second intermediate image generation units 431 and 433, respectively. A pseudo leak gas image is generated by adding the first and second intermediate gas images generated in S17 (S18). That is, the pseudo image generation unit 434 mutually corresponds each pixel value of each pixel in the first intermediate gas image generated in process S15 and each pixel value of each pixel in the second intermediate gas image generated in process S17. The pixel positions are added together, thereby generating a pseudo leak gas image. For example, the pseudo leak gas image VP shown in FIG. 6 is generated from the base image BP shown in FIG. 4A and the gas image GPa shown in FIG. 4B.

Then, the pseudo leak gas image generation apparatus D outputs the pseudo leak gas image generated in this way to the output unit 3 by the control processing unit 4 (S19), and ends this processing.

As described above, the pseudo-leakage gas image generation device D and the pseudo-leakage gas image generation method implemented in the embodiment include the pseudo-leakage gas image generation unit 43, so that gas leaks to an actual subject. Can be generated. Therefore, the pseudo-leakage gas image generation device D and the pseudo-leakage gas image generation method use a target image obtained by imaging a target region for detecting gas leakage when there is no gas leakage in the base image BP. It is possible to generate a pseudo leak gas image VP that can be suitably used for verifying the effectiveness of the gas detection device.

Since the pseudo leak gas image generation apparatus D and the pseudo leak gas image generation method include the input unit 2 and the image processing unit 42, the gas of the gas image can be deformed according to the processing conditions, and a plurality of gas images can be generated from one gas image. A plurality of gas images can be formed for each of the gas leakage states. Therefore, the pseudo leak gas image generation apparatus D and the pseudo leak gas image generation method can generate a plurality of pseudo leak gas images VP that simulate the plurality of gas leak states.

The pseudo-leakage gas image generation apparatus D and the pseudo-leakage gas image generation method can generate the pseudo-leakage gas image VP with a gas image corresponding to a desired concentration-thickness product when the processing condition is a gas concentration-thickness product. . The pseudo leak gas image generation apparatus D and the pseudo leak gas image generation method can generate a pseudo leak gas image VP with a gas image corresponding to a desired leak direction when the processing condition is a gas leak direction. The pseudo leak gas image generation device D and the pseudo leak gas image generation method can generate VP a pseudo leak gas image with a gas image corresponding to a desired leak range when the processing condition is a gas leak range. The pseudo leak gas image generation apparatus D and the pseudo leak gas image generation method can generate a pseudo leak gas image VP with a gas image corresponding to a desired leak position when the processing condition is a gas leak position. The pseudo leak gas image generation device D and the pseudo leak gas image generation method can generate a pseudo leak gas image VP with a gas image corresponding to a desired temperature when the processing condition is a gas temperature.

In the above-described embodiment, the pseudo leak gas image generation device D may further process the base image BP according to a desired temperature. In this case, the processing condition further includes an air temperature with respect to the base image, and the temperature processing program further processes the base image according to an air temperature with respect to the base image as another example of the processing conditions, and the temperature The processing unit 424 further processes the base image according to the temperature of the base image as another example of the processing conditions. More specifically, the temperature processing unit 424 converts the base image into the base temperature image expressed in temperature based on a predetermined second correspondence between the pixel value and the temperature, and the converted base The temperature image is corrected according to the temperature received as the processing condition. For example, the difference between the temperature received as the processing condition and the temperature at the time of capturing the base image is uniformly added to the base image, so that the converted base temperature image corresponds to the temperature received as the processing condition. Will be corrected. Then, the temperature processing unit 424 processes the corrected base temperature image into a base image corresponding to the temperature by inversely converting the corrected base temperature image into the base image represented by pixel values based on the second correspondence relationship. .

The second correspondence relationship is expressed by, for example, the above formula (1), and is expressed by the following formula (2) that is an inverse function of the formula (1) at the time of inverse transformation.

ここで、Ｐは、ベース画像の画素値であり、Ｔは、温度（絶対温度）であり、Ｂ，ＲおよびＤは、ベース画像を生成する撮像装置（撮像部）によって決定される定数である。これら定数Ｂ、ＲおよびＤは、互いに異なる複数の温度で黒体炉を前記撮像装置（前記撮像部）で撮像することによって適宜に設定される。

Here, P is the pixel value of the base image, T is the temperature (absolute temperature), and B, R, and D are constants determined by the imaging device (imaging unit) that generates the base image. . These constants B, R, and D are appropriately set by imaging a black body furnace with the imaging device (the imaging unit) at a plurality of different temperatures.

Such a pseudo leak gas image generation device D can change the temperature of the base image BP, so that the base image BP corresponding to each season can be formed, and the pseudo leak gas image VP corresponding to each season can be generated. Therefore, the pseudo-leakage gas image generation apparatus D uses the target image obtained by imaging the target area for detecting the gas leakage when there is no gas leakage in the base image BP, thereby improving the effectiveness of the gas detection apparatus. A pseudo leak gas image VP of each season that can be suitably used for verification can be generated.

Next, another embodiment will be described.

(Second Embodiment)
This 2nd Embodiment is gas detection apparatus S provided with the pseudo | simulation leak gas image generation apparatus D in 1st Embodiment. FIG. 8 is a block diagram illustrating a configuration of the gas detection device according to the second embodiment. For example, as shown in FIG. 8, the gas detection device S according to the second embodiment includes an imaging unit 11, an input unit 12, an output unit 13, a control processing unit 14, and a storage unit 15. .

The imaging unit 11 is an apparatus that is connected to the control processing unit 14 and generates a target image by imaging a target region in which gas leakage is detected by the gas detection device S according to the control of the control processing unit 14. The imaging unit 11 may be housed in a housing (not shown) together with the other units 12 to 15 in the gas detection device S, and may be configured integrally with the other units 12 to 15. Alternatively, the imaging unit 11 is configured separately from the other units 12 to 15, and the imaging unit 11 is disposed remotely so as to capture the target area, and is connected to the control processing unit 14 by wire or wirelessly. It may be connected so that communication is possible. The imaging unit 11 is, for example, a device that generates an infrared image because it detects the presence or absence of gas using infrared light, and is a digital infrared camera or the like described as an example of the image acquisition unit 1 in the first embodiment. is there.

The input unit 12, the output unit 13, and the storage unit 15 each further stores a leak detection program that detects a gas leak based on an image as one of the programs included in the control processing program of the storage unit 15. The output unit 13 further outputs the leakage detection result, and the input unit 12 further accepts selection of one of the pseudo-leakage gas image and the target image. This is the same as each of the input unit 2, the output unit 3, and the storage unit 5 in the pseudo leak gas image generation apparatus D, and the description thereof is omitted. Note that the input unit 2 and the output unit 3 may constitute a touch panel as described above. Further, the storage unit 15 functionally includes a base image storage unit 151 and a gas image information storage unit 152 similar to the base image storage unit 51 and the gas image information storage unit 52, respectively, in the first embodiment. In the present embodiment, the input unit 12 is not only an example of the processing condition reception unit, but also an example of an image selection reception unit that receives selection of one of the pseudo leak gas image and the target image. .

The control processing unit 14 is a circuit for controlling each unit 11 to 13 and 15 of the gas detection device S according to the function of each unit and detecting gas leakage based on an image. The control processing unit 14 includes, for example, a CPU and its peripheral circuits. The control processing unit 14 functionally includes a control unit 141, a leakage detection unit 142, an image processing unit 143, and a pseudo leakage gas image generation unit 144 by executing the control processing program.

The control unit 141 controls each unit 11 to 13 and 15 of the gas detection device S according to the function of each unit, and controls the entire gas detection device S. The control unit 141 causes the gas detection device S to operate in a plurality of modes including at least a normal operation mode and a verification operation mode. The normal operation mode is a mode in which the gas detection device S operates so as to detect gas leakage based on a target image obtained by imaging a target region with the imaging unit 11. The verification operation mode is a mode in which the gas detection device S operates so as to detect gas leakage based on the pseudo leak gas image generated by the pseudo leak gas image generation unit 144. The control unit 141 operates the gas detection device S in the mode selected by the user (operator) received by the input unit 12.

The leakage detection unit 142 detects gas leakage based on the image. The image processed by the leak detection unit 142 is one of the pseudo leak gas image and the target image, and is switched according to the selection received by the input unit 12. For this reason, when the target image is selected and received by the input unit 12, the gas detection device S operates in the normal operation mode, and the leak detection unit 142 detects gas leakage based on the target image. The gas detection device S monitors (monitors) gas leakage in the target area. On the other hand, when the pseudo leak gas image is selected and received by the input unit 12, the gas detection device S operates in the verification operation mode, and the leak detection unit 142 is based on the pseudo leak gas image. Gas leakage is detected, and the gas detection device S verifies the effectiveness of the device itself.

The image processing unit 143 and the pseudo-leakage gas image generation unit 144 are the same as the image processing unit 42 and the pseudo-leakage gas image generation unit 43 in the first embodiment, respectively, and thus description thereof is omitted.

Next, the operation of this embodiment will be described. FIG. 9 is a diagram showing an input screen displayed on the gas detection device as an example. FIG. 9A shows an input screen when the normal operation mode is selected, and FIG. 9B shows an input screen when the verification operation mode is selected. FIG. 10 is a flowchart showing the operation of the gas detection device. FIG. 11 is a flowchart showing the gas detection operation in each of the normal operation and the detectability verification operation in the flowchart shown in FIG. FIG. 12 is a diagram for explaining the time averaging process in the flowchart shown in FIG. 11. The horizontal axis in FIG. 12 indicates time in terms of the number of frames, and the vertical axis indicates the temperature expressed in [° C.] units. FIG. 13 is a diagram for explaining the difference processing in the flowchart shown in FIG. FIG. 13A shows a case of averaging in 21 frames as an example, and FIG. 13B shows a case of averaging in 3 frames as an example. Each horizontal axis in FIGS. 13A and 13B indicates time in terms of the number of frames, and each vertical axis indicates a temperature expressed in [° C.] units. FIG. 14 is a diagram for explaining standard deviation calculation processing in the flowchart shown in FIG. 11. FIG. 15 is a diagram for explaining the gas leakage determination process in the flowchart shown in FIG. 11. Each horizontal axis in FIGS. 14 and 15 represents time in terms of the number of frames, and each vertical axis represents standard deviation. FIG. 16 is a diagram for explaining how the frames are arranged in the first to third modes in the gas detection operation in the detection performance verification operation. FIG. 16A shows how frames are arranged in the first mode, FIG. 16B shows how frames are arranged in the second mode, and FIG. 16C shows how frames are arranged in the third mode. FIG. 16D shows how the base images (target images) are arranged with respect to the arrangement of frames in the first to third modes shown in FIGS. 16A to 16C.

The gas detection device S having such a configuration, when the power is turned on, executes necessary initialization of each part and starts its operation. By executing the control processing program, the control processing unit 14 is functionally configured with a control unit 141, a leakage detection unit 142, an image processing unit 143, and a pseudo leakage gas image generation unit 144.

When the operation is started, a predetermined input screen is displayed on the output unit 13 of the gas detection device S. The input screen is a screen for accepting selection of a mode, selection of a gas image and input of processing conditions by the user, and displaying a target image or a pseudo leak gas image, and an example thereof is shown in FIG. The input screen 61 shown in FIG. 9 includes a selection mode input area 611, a selected gas image input area 612, a processing condition input area 613, and an image display area 614.

The selection mode input area 611 is an area for inputting the mode selected by the user. In this embodiment, the first radio button 6111 for inputting the selection of the normal operation mode and the selection of the verification operation mode are selected. And a second radio button 6112 for inputting. The selected gas image input area 612 is an area for inputting the gas image selected by the user with the gas image number assigned to the gas image. The machining condition input area 613 is an area for inputting a machining condition by a user. In this embodiment, a flow condition input area 6131 for inputting a flow rate, an injection direction (leakage direction), a wind speed and a wind direction, and an injection. A direction (leakage direction) condition input area 6132, a wind speed condition input area 6133, and a wind direction condition input area 6134 are provided. The image display area 614 is an area for displaying the target image or the pseudo leak gas image according to the mode selected and input in the selection mode input area 611. In the input screen 61 shown in FIG. 9A, the first radio button 6111 is input, the gas detection device operates in the normal operation mode, and the target image is displayed in the image display area 614. On the other hand, in the input screen 61 shown in FIG. 9B, the second radio button 6112 is input, the gas detection device operates in the verification operation mode, and the pseudo leak gas image is displayed in the image display area 614. Yes.

When such an input screen 61 is displayed on the output unit 13, in FIG. 10, the gas detection device S first executes various predetermined controls by the control unit 141 of the control processing unit 14 (S21). The various types of control include, for example, confirmation of the state of the imaging unit 11, confirmation of the state of the output unit 13, confirmation of program startup, and the like.

Next, the gas detection device S confirms whether or not there is a stop signal that is interrupted and input by the user's input operation to a stop button (not shown) by the control unit 141 (S22).

Next, the gas detection device S determines whether or not to stop based on the presence or absence of the stop signal confirmed in the process S22 by the control unit 141 (S23). As a result of this determination, if the stop signal is present and the stop signal is stopped (Yes), the present processing is terminated and the gas detection device S is stopped. On the other hand, as a result of the determination, if the stop signal does not exist and is not a stop (No), the mode selected by the input operation by the user with respect to the selection mode input area 611 of the input screen 61 is confirmed ( S24). As a result of the determination, when the normal operation mode is selected by the user and the first radio button 6111 is input, the control unit 141 determines that the operation mode is the normal operation mode, and then executes step S26. The process returns to process S21. On the other hand, as a result of the determination, if the verification operation mode is selected by the user and the second radio button 6112 is input, the control unit 141 determines that the verification operation mode is selected, and then executes step S27. After that, the process returns to the process S21.

In process S26, the gas detection device S operates in the normal operation mode. That is, the gas detection device S operates so as to detect gas leakage based on the target image obtained by imaging the target region with the imaging unit 11. The detection method for detecting gas leakage is not particularly limited, and various methods can be employed. In the present embodiment, as an example, gas leakage is detected by the detection method shown in FIG.

In FIG. 11, in the gas detection device S, the leak detection unit 142 executes time averaging processing for low frequency extraction (S31-1), and executes time averaging processing for high frequency extraction (S31-). 2). In the present embodiment, the leakage detection unit 142 detects gas leakage from a plurality of target images arranged in time series. More specifically, for example, a moving image of a target image obtained by capturing a target region at 30 [fps] is used. In the process S31-1, the leakage detection unit 142 obtains the average value of the pixel values of the preceding and succeeding 21 frames for each frame from the moving image of the target image for each pixel. Thus, for each pixel, a low frequency signal (low frequency component data) included in the original data including pixel values arranged in time series is extracted. This low frequency component data is handled as data corresponding to a temperature change of the background (target area in the case of no gas leakage) with respect to the leaked gas. The preceding and following 21 frames are 21 frames including the frame, 10 frames that are temporally previous (past) relative to the frame, and 10 frames that are temporally subsequent (future) to the frame. It is. For this reason, in this embodiment, although the detection of the gas leakage is delayed for at least 10 frames (1/3 second), the gas leakage can be detected substantially in real time without any practical problem. In the processing S31-2, the leakage detection unit 142 obtains an average value of the pixel values of the three frames before and after each frame from the moving image of the target image for each pixel. As a result, a high-frequency signal (high-frequency component data) included in the original data is extracted for each pixel. The three frames before and after are three frames: the frame, one frame temporally previous (past) to the frame, and one frame temporally subsequent (future) to the frame. It is. An example is shown in FIG. FIG. 12 shows data in one pixel in the target image, the solid line shows the original pixel value (the original data), and the alternate long and short dash line shows the time average of the previous and subsequent 21 frames (the low frequency component data). The broken line indicates the time average of the three frames before and after (the high-frequency component data).

Next, in the gas detection device S, the leak detection unit 142 executes the first difference process (S32-1) and the second difference process (S32-2). More specifically, in process S32-1, the leakage detection unit 142 calculates, for each frame, the difference between the original data and the low frequency component data obtained in process S31-1 for each pixel. Asking. In process S32-2, the leak detection unit 142 obtains the difference between the original data and the high frequency component data obtained in process S31-2 as second difference data for each pixel for each frame. In one example, when the first difference processing is executed for each data shown in FIG. 12, the first difference data shown in FIG. 13A is obtained, and when the second difference processing is executed for each data shown in FIG. Second difference data shown in FIG. 13B is obtained.

The example shown in FIG. 12 is a sample in which gas is leaked from around 90 frames, but in FIG. 13B, it is difficult to determine the presence or absence of gas leakage due to noise components. In addition, the noise component included in the first difference data and the noise component included in the second difference data are not necessarily correlated. Therefore, in this embodiment, in order to remove this noise component, the gas detection device S performs the process of the first standard deviation by the leakage detection unit 142 after each of the processes S32-1 and S32-2. Then, the process of the second standard deviation is executed (S33-2). More specifically, in process S33-1, the leak detection unit 142 obtains the standard deviation for each frame as the first standard deviation data for each pixel in 21 frames before and after the first difference data for each frame. In the process S33-2, the leakage detection unit 142 obtains the standard deviation as the second standard deviation data for each pixel in the 21 frames before and after the second difference data for each frame. In one example, when the process of the first standard deviation is executed on the first difference data shown in FIG. 13A, the first standard deviation data shown by the broken line in FIG. 14 is obtained, and the second difference data shown in FIG. When the second standard deviation processing is executed, second standard deviation data indicated by a solid line in FIG. 14 is obtained.

Next, the gas detection device S obtains the difference between the first standard deviation data and the second standard deviation data for each frame as the standard deviation difference data for each frame by the leak detection unit 142 (S34). . In one example, when the difference between the first and second standard deviations shown in FIG. 14 is obtained, the standard deviation difference data shown in FIG. 15 is obtained. In FIG. 15, the noise component is reduced, and the standard deviation difference data is substantially 0 until around 90 frames, and the standard deviation difference data from around 90 frames is a significant value.

Therefore, next, the gas detection device S determines for each pixel whether or not there is gas leakage based on the standard deviation difference data obtained in step S34 for each frame by the leakage detection unit 142 (S35). More specifically, the leakage detection unit 142 determines whether or not there is gas leakage for each frame by determining whether or not the standard deviation difference data obtained in step S34 is greater than or equal to a predetermined threshold (determination threshold). Is determined for each pixel. When the standard deviation difference data is greater than or equal to the threshold, the leak detection unit 142 determines that there is a gas leak, and when the standard deviation difference data is not greater than or equal to the threshold (the standard deviation difference data is greater than the threshold If it is less than that, the leakage detection unit 142 determines that there is no gas leakage. The determination threshold is appropriately set in advance from a plurality of samples.

And the gas detection apparatus S outputs the determination result of process S35 to the output part 13 by the leak detection part 142 (S36), and complete | finishes this process.

In the above description, the front and rear 21 frames are used to generate the low frequency component data, the front and rear 3 frames are used to generate the high frequency component data, and the front and rear 21 frames are used to generate the standard deviation. However, the number of frames used for generating the low-frequency component data is appropriately changed under the condition that the number of frames used for generating the high-frequency component data is larger.

In the present embodiment, the gas detection device S detects the presence or absence of gas leakage by operating in this way in the normal operation mode.

Referring back to FIG. 10, in the process S27, the gas detection device S operates in the verification operation mode. That is, the gas detection device S operates so as to detect gas leakage based on the pseudo leak gas image generated by the pseudo leak gas image generation unit 144. As described above, the detection method for detecting gas leakage is not particularly limited, and various methods can be adopted. However, in the present embodiment, the leakage detection unit 142 detects gas leakage from a plurality of target images arranged in time series. A leak has been detected. For this reason, in this process S27, first, the image processing unit 143 generates a plurality of gas images that gradually expand the gas range in the leakage direction. Next, the pseudo leakage gas image generation unit 144 uses the target images captured by the imaging unit 11 as the plurality of generated gas images and the base image, thereby generating a plurality of pseudo leakage gas images arranged in time series. It is generated by each process described with reference to FIG. 3 in the first embodiment. And the leak detection part 142 detects the leak of gas by each process mentioned above using FIG. 10 based on these produced | generated several quasi-leakage gas images arranged in a time series. The detection result is output to the output unit 13, and the user can determine the detectability of the gas detection device S and determine the effectiveness of the gas detection device S by referring to the detection result.

For example, in the example illustrated in FIG. 9B, the image processing unit 143 displays a plurality of gas images that gradually expands the gas range in the ejection direction (leakage direction) 0 [°] according to the flow rate 0.5 [L / sec]. Generate. At this time, a wind blowing at 1.5 [m / sec] in the 90 [°] direction is considered. More specifically, for each frame, the enlargement ratio is obtained based on the attribute information of the gas image and the flow rate of 0.5 [L / sec], the attribute information of the gas image, the ejection direction (leak direction), the wind speed, A rotation angle is obtained based on the wind direction, and the gas image is processed. Thereby, a plurality of gas images are generated for each frame. For example, n pseudo-leakage gas images for each frame are generated using, for example, n gas images and target images generated in this manner. The target image may be each image of each frame captured by the imaging unit 11 or may be one image captured by the imaging unit 11. Gas leakage is detected using the generated n pseudo-leakage gas images.

In the detection of gas leakage by the leakage detection unit 142, n pseudo leakage gas images can be used in various modes.

For example, in the first mode, a plurality of sets are arranged with n pieces of pseudo leak gas images as one set, and as shown in FIG. 16A, the first to nth pseudo leak gas images arranged in time series. Are arranged in the time series, and the second set of the first to nth pseudo leak gas images are arranged in the reverse order of the time series, followed by the third set of the first to nth pseudo leaks. The gas images are arranged in the time series, and then the fourth set of the first to n-th pseudo leak gas images are arranged in the reverse order of the time series, and so on. In such a way of arranging the first mode, the continuity of the change of the leaked gas can be maintained, so that the gas can be detected more accurately by the above-described gas detection method.

Also, for example, in the second mode, as shown in FIG. 16B, a plurality of sets are simply arranged sequentially in the time series order with n pseudo leak gas images as one set. In such a second mode of arrangement, a plurality of sets are simply arranged in sequence, and the information processing load can be suppressed.

Also, for example, in the third mode, as shown in FIG. 16C, n sets of pseudo leak gas images are set as one set, and only this one set is arranged. In such a way of arranging the third mode, only one set is provided, so that the verification result can be obtained earliest.

Note that, in this example, as shown in FIG. 16D, each image of each frame imaged by the imaging unit 11 is based on each frame arrangement in the first to third modes shown in FIGS. 16A to 16C. Used as an image (target image).

As described above, the gas detection device S according to the second embodiment includes the pseudo-leakage gas image generation device D. Therefore, by using the pseudo-leakage gas image by the gas detection device S alone, Validity can be verified. If the gas leakage can be detected as a result of the verification, it can be confirmed that there is no abnormality in the gas detection device S. Further, by verifying the effectiveness, it is possible to select (examine) the installation conditions of the gas detection device S and to examine combinations with other detection devices.

This specification discloses various modes of technology as described above, and the main technologies are summarized below.

According to an aspect of the present invention, a pseudo-leakage gas image generation device uses, as a pseudo-leakage gas image, an image that simulates the leakage of the gas to the subject based on a base image obtained by capturing an actual subject and a gas image containing only gas. A pseudo leak gas image generation unit is provided. Preferably, in the above-described pseudo leak gas image generation device, the gas image is a gas light absorptivity image in which the spatial density thickness product distribution of the gas is represented by the light absorptance of the gas, and the pseudo leak gas For each pixel of the gas image, the image generation unit generates a first intermediate gas image by multiplying a pixel value of the pixel by a predetermined black body radiance equivalent value, and the gas For each pixel of the image, the light transmittance image of the gas is generated by subtracting the pixel value of the pixel from the maximum pixel value that can be taken by the pixel value corresponding to the numerical value “1” meaning complete transmission A transmissivity image generating unit, a second intermediate image generating unit that generates a second intermediate gas image by multiplying the base image by the light transmittance image of the gas generated by the transmissivity image generating unit, and First And a pseudo image generation unit that generates the pseudo leak gas image by adding the first and second intermediate gas images generated by the second intermediate image generation unit, and the black body radiance equivalent value is the temperature Is a value obtained by correcting the black body radiance of a black body having a temperature corresponding to the above with the sensitivity characteristic of the imaging device that generates the base image.

Since such a pseudo leak gas image generation apparatus includes the pseudo leak gas image generation unit, it is possible to generate a pseudo leak gas image that simulates a gas leak with respect to an actual subject. Therefore, the pseudo-leakage gas image generation device verifies the effectiveness of the gas detection device by using, as the base image, a target image obtained by imaging a target region for detecting gas leakage when there is no gas leakage. It is possible to generate a pseudo-leakage gas image that can be suitably used for the above.

In another aspect, in the above-described pseudo-leakage gas image generation device, a processing condition reception unit that receives a processing condition for processing the gas image, and an image that processes the gas image under the processing condition received by the processing condition reception unit A pseudo-leakage gas image generation unit that generates the pseudo-leakage gas image based on the base image and the gas image processed by the image processing unit.

Such a pseudo-leakage gas image generation device further includes the processing condition receiving unit and the image processing unit, so that the gas of the gas image can be deformed according to the processing conditions, and a plurality of gas leaks from one gas image. A plurality of gas images in each state can be formed. Therefore, the pseudo leak gas image generation device can generate a plurality of pseudo leak gas images simulating the gas leak states.

In another aspect, in the above-described pseudo-leakage gas image generation device, the processing condition includes at least one of a concentration thickness product, a leakage direction, a leakage range, a leakage position, and a temperature in the gas.

Such a pseudo leak gas image generation device can generate a pseudo leak gas image with a gas image corresponding to a desired concentration thickness product when the processing condition is a gas concentration thickness product. The pseudo leak gas image generation device can generate a pseudo leak gas image with a gas image corresponding to a desired leak direction when the processing condition is a gas leak direction. The pseudo leak gas image generation device can generate a pseudo leak gas image with a gas image corresponding to a desired leak range when the processing condition is a gas leak range. The pseudo leak gas image generation apparatus can generate a pseudo leak gas image with a gas image corresponding to a desired leak position when the processing condition is a gas leak position. The pseudo leak gas image generating device can generate a pseudo leak gas image with a gas image corresponding to a desired temperature when the processing condition is a gas temperature.

In another aspect, in the above-described pseudo leak gas image generation device, the processing condition further includes an air temperature with respect to the base image, and the image processing unit determines the base image to have a predetermined correspondence between a pixel value and a temperature. Based on the relationship, it is converted into the base temperature image expressed in temperature, the converted base temperature image is corrected according to the temperature received by the processing condition receiving unit, the corrected base temperature image, Based on the predetermined correspondence relationship, the base image is processed into a base image corresponding to the temperature by performing inverse conversion to the base image represented by pixel values.

Such a pseudo leak gas image generating apparatus can change the temperature of the base image, so that a base image corresponding to each season can be formed, and a pseudo leak gas image corresponding to each season can be generated. Therefore, the pseudo-leakage gas image generation device verifies the effectiveness of the gas detection device by using, as the base image, a target image obtained by imaging a target region for detecting gas leakage when there is no gas leakage. It is possible to generate pseudo-leakage gas images for each season that can be suitably used.

In another aspect, in the above-described pseudo leak gas image generation device, the gas image is an electromagnetic wave absorptivity image of the gas in which the space concentration thickness product distribution of the gas is represented by an electromagnetic wave absorptivity. Preferably, in the above pseudo leak gas image generation device, the electromagnetic wave is infrared light.

Such a pseudo-leakage gas image generating device can suitably generate, for example, a pseudo-leakage gas image of a gas that absorbs infrared light or ultraviolet light.

According to another aspect of the present invention, there is provided a pseudo-leakage gas image generation method, in which a pseudo-leakage gas is obtained by simulating an image of the gas leakage with respect to the subject based on a base image obtained by imaging an actual subject and a gas image containing only gas. A pseudo-leakage gas image generation step for generating an image is provided.

Since such a pseudo leak gas image generation method includes the pseudo leak gas image generation step, it is possible to generate a pseudo leak gas image that simulates a gas leak with respect to an actual subject. Therefore, the pseudo-leakage gas image generation method verifies the effectiveness of the gas detection device by using, as the base image, a target image obtained by imaging a target region for detecting gas leakage when there is no gas leakage. It is possible to generate a pseudo-leakage gas image that can be suitably used for the above.

A gas detection apparatus according to another aspect includes any one of the above-described pseudo leak gas image generation apparatus, a leak detection unit that detects a gas leak based on an image, and a detection result of the leak detection unit to the outside. An output unit that outputs, and an image selection receiving unit that receives selection of any one of the pseudo-leakage gas image and a target image obtained by imaging a target region for detecting gas leakage, and the base image is This is a target image obtained by imaging the target area when there is no gas leakage, and the leakage detection unit detects gas leakage based on the image received by the image selection reception unit.

Since such a gas detection device includes any one of the above-described pseudo leak gas image generation devices, the effectiveness of the gas detection device can be verified by using the pseudo leak gas image with the gas detection device alone.

This application is based on Japanese Patent Application No. 2017-080274 filed on April 14, 2017, the contents of which are included in this application.

Although embodiments of the present invention have been illustrated and described in detail, it is merely exemplary and illustrative and not limiting. The scope of the invention should be construed by the language of the appended claims.

In order to express the present invention, the present invention has been properly and fully described through the embodiments with reference to the drawings. However, those skilled in the art can easily change and / or improve the above-described embodiments. It should be recognized that this is possible. Therefore, unless the modifications or improvements implemented by those skilled in the art are at a level that departs from the scope of the claims recited in the claims, the modifications or improvements are not covered by the claims. To be construed as inclusive.

ADVANTAGE OF THE INVENTION According to this invention, a pseudo | simulation leak gas image generation apparatus, a pseudo leak gas image generation method, and a gas detection apparatus provided with the same can be provided.

Claims (7)

A pseudo-leakage gas image generation unit that generates, as a pseudo-leakage gas image, an image that simulates the leakage of the gas with respect to the subject, based on a base image obtained by imaging an actual subject and a gas image of only gas;
Pseudo leak gas image generation device. A processing condition receiving unit that receives processing conditions for processing the gas image;
An image processing unit that processes the gas image under processing conditions received by the processing condition receiving unit;
The pseudo leak gas image generation unit generates the pseudo leak gas image based on the base image and the gas image processed by the image processing unit.
The pseudo leak gas image generation device according to claim 1. The processing conditions include at least one of a concentration thickness product, a leakage direction, a leakage range, a leakage position, and a temperature in the gas.
The pseudo-leakage gas image generation device according to claim 2. The processing condition further includes an air temperature for the base image,
The image processing unit converts the base image into the base temperature image represented by temperature based on a predetermined correspondence relationship between a pixel value and temperature, and receives the processing condition reception of the converted base temperature image. The base image corresponding to the temperature is corrected by inversely converting the corrected base temperature image into the base image represented by a pixel value based on the predetermined correspondence. To process,
The pseudo-leakage gas image generation device according to claim 3. The gas image is an electromagnetic wave absorptivity image of the gas in which the space concentration thickness product distribution of the gas is represented by an absorptance of electromagnetic waves.
The pseudo-leakage gas image generation device according to any one of claims 1 to 4. Based on a base image obtained by imaging an actual subject and a gas image of only gas, a pseudo-leakage gas image generation step of generating an image that simulates the leakage of the gas as a pseudo-leakage gas image with respect to the subject,
Pseudo leak gas image generation method. The pseudo-leakage gas image generation device according to any one of claims 1 to 5,
A leak detector for detecting gas leaks based on the image;
An output unit for outputting the detection result of the leak detection unit to the outside;
An image selection accepting unit that accepts selection of any one of the pseudo-leakage gas image and a target image obtained by imaging a target region for detecting gas leakage;
The base image is a target image obtained by capturing the target region when there is no gas leakage,
The leakage detection unit detects gas leakage based on the image received by the image selection reception unit;
Gas detector.

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