WO2018072598A1 - Human body height measurement method and device, and smart mirror - Google Patents

Abstract

A human body height measurement method and device, and a smart mirror. The human body height measurement method comprises: obtaining an image by means of a camera (520) (110); when a user image in the image is a whole body image, obtaining a distance between a user and a lens of the camera (520) by means of a distance measurement sensor (530) (120); calculating the height of the user according to the distance between the user and the lens of the camera (520), the distance between the lens of the camera (520) and an image sensor and the imaging height of the user on the image sensor of the camera (520) (130); and presenting the height of the user to the user in a preset presentation manner (140). In the technical solution of the present application, an image of a user is obtained by means of a camera (520), the distance between the user and the camera (520) is measured, and the height of the user is calculated and presented to the user, thereby improving the convenience of height measurement.

Description

Human body height measuring method, device and smart mirror Technical field

Embodiments of the present invention relate to measurement technologies, and in particular, to a method, a device, and a smart mirror for measuring a human body height.

Background technique

Nowadays, more and more smart products are entering people's lives. The functions of smart products are rich and varied. For example, people can measure their height through smart products equipped with cameras.

In the existing height measurement scheme, the user stands in front of the background on which the height scale line is drawn, takes a picture through the camera, and then recognizes the scale of the ruler through the image recognition algorithm, thereby obtaining the height of the human body.

However, in the prior art, in order to measure the height, the user needs to prepare a ruler, which is inconvenient.

Summary of the invention

The invention provides a method, a device and a smart mirror for measuring the height of a human body, so as to realize the height of the user without measuring the scale.

In a first aspect, an embodiment of the present invention provides a method for measuring a height of a human body, including:

Obtain an image through the camera;

When the user image in the image is a whole body image, the distance between the user and the lens of the camera is acquired by the ranging sensor;

Depending on the distance between the user and the lens of the camera, the lens to image sensing of the camera Calculate the height of the user by the distance between the devices and the imaging height of the user on the image sensor of the camera;

Displaying the height of the user to the user according to a preset display manner.

Further, after acquiring the image through the camera, the method further includes:

Performing edge detection on the image to obtain an edge detection map;

Obtaining a head contour and a foot contour of the human body according to the edge detection map;

When the image includes both the head contour and the foot contour of the human body, it is determined that the user image in the image is a whole body image.

Further, before calculating the height of the user according to the distance between the user and the lens of the camera, the distance between the lens of the camera and the image sensor, and the imaging height of the user on the image sensor of the camera, include:

Determining, according to the head profile, a first pixel point in the image sensor corresponding to a highest point of a user's head in the image;

Determining, according to the foot profile, a second pixel point in the image sensor corresponding to a lowest point of a user foot in the image;

The distance in the vertical direction between the first pixel point and the second pixel point is taken as the imaging height of the user's whole body on the image sensor of the camera.

Further, after acquiring the head contour and the foot contour of the human body according to the edge detection map, the method further includes:

Determining that the user image in the image is a non-whole body image when at least one of the head contour and the foot contour does not exist in the image;

The user is prompted to move in a direction away from the camera according to a preset prompt manner.

Further, before acquiring the image through the camera, the method further includes:

Obtain a height measurement instruction;

When the height measurement instruction is acquired, an operation of acquiring an image is performed.

In a second aspect, the embodiment of the present invention further provides a human body height measuring device, including:

An image acquisition module, configured to acquire an image by using a camera;

a human distance measuring module, configured to acquire a distance between a user and a lens of the camera by using a ranging sensor when the user image in the image is a whole body image;

a height calculation module for calculating a height of the user according to a distance between the user and the lens of the camera, a distance between the lens of the camera and the image sensor, and an imaging height of the user on the image sensor of the camera;

The height display module is configured to display the height of the user to the user according to a preset display manner.

Further, the human body height measuring device further includes:

An image edge detection module, configured to perform edge detection on the image to obtain an edge detection map;

a contour acquiring module, configured to acquire a head contour and a foot contour of the human body according to the edge detection map;

The whole body image determining module is configured to determine that the user image in the image is a whole body image when the image includes a head contour and a foot contour of the human body.

Further, the human body height measuring device further includes:

a first pixel point determining module, configured to determine, according to the head contour, a first pixel point in the image sensor corresponding to a highest point of a user head in the image;

a second pixel point determining module, configured to determine, according to the foot contour, a second pixel point in the image sensor corresponding to a lowest point of a user foot in the image;

An imaging height determining module is configured to use a distance in a vertical direction between the first pixel point and the second pixel point as an imaging height of a user's whole body on an image sensor of the camera.

Further, the human body height measuring device further includes:

a non-full body image determining module, configured to determine, when the at least one of the head contour and the foot contour does not exist in the image, the user image in the image is a non-body image;

The mobile prompting module is configured to prompt the user to move in a direction away from the camera according to a preset prompt manner.

Further, the human body height measuring device further includes:

a measurement instruction acquisition module, configured to acquire a height measurement instruction;

And an operation execution module, configured to perform an operation of acquiring an image when the height measurement instruction is acquired.

In a third aspect, an embodiment of the present invention provides a smart mirror, including a mirror, a camera, and a ranging sensor, and further includes the human body height measuring device according to the second aspect.

Further, the mirror surface is a plane mirror;

The lens optical axis direction of the camera and the axial direction of the ranging sensor are both perpendicular to the mirror surface.

The embodiment of the invention acquires the image of the user through the camera, measures the distance between the user and the camera, calculates the height of the user and presents it to the user, solves the problem that the height of the scale needs to be prepared by the camera, and realizes the effect of measuring the height conveniently and quickly. .

DRAWINGS

1 is a flow chart of a method for measuring a body height according to a first embodiment of the present invention;

2 is a flow chart of a method for measuring a body height according to a second embodiment of the present invention;

3 is a flow chart of a method for measuring a body height according to a third embodiment of the present invention;

4 is a schematic structural view of a human body height measuring device according to Embodiment 4 of the present invention;

FIG. 5 is a schematic front structural view of a smart mirror according to Embodiment 5 of the present invention.

detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. It should also be noted that, for ease of description, only some, but not all, of the structures related to the present invention are shown in the drawings.

Embodiment 1

FIG. 1 is a flowchart of a method for measuring a body height according to a first embodiment of the present invention. The embodiment is applicable to a method for measuring a human body height using an intelligent terminal configured with a camera and a distance measuring sensor, and the method can be measured by a human body height. The device is implemented by a hardware and/or software, and the human body height measuring method specifically includes the following steps:

Step 110: Acquire an image through a camera.

The camera includes a lens and an image sensor. In this embodiment, the lens of the camera is a fixed focus camera, and the image sensor may be a CCD (Charge-coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor). .

Step 120: When the user image in the image is a whole body image, the distance between the user and the lens of the camera is obtained by the ranging sensor.

Wherein, measuring the height of the human body requires acquiring the whole body image of the user, obtaining an image through the camera, and determining whether the image of the user is included in the image. When the image includes the whole body image of the user, the distance sensor is used to obtain the lens between the user and the camera. The distance is the object distance in the optical imaging system. The ranging sensor can be an infrared ranging sensor, an ultrasonic ranging sensor, or a laser ranging sensor.

Step 130: Calculate the height of the user according to the distance between the user and the lens of the camera, the distance between the lens of the camera and the image sensor, and the imaging height of the user on the image sensor of the camera.

Wherein, the distance between the lens of the camera and the image sensor is the image distance in the optical imaging system, and the distance between the lens of the camera and the image sensor can be determined due to the fixed focus camera. The imaging height of the user on the image sensor of the camera refers to the imaging height of the user's whole body on the image sensor, that is, the image height of the user's whole body. Then, according to the object distance, image distance and image height of the optical imaging system, the height of the object, that is, the height of the user, can be calculated.

Step 140: Display the height of the user to the user according to a preset display manner.

The preset display manner of the user's height can be displayed to the user in a text manner through a display screen configured on the smart terminal, and/or displayed to the user in a voice manner through an audio output device configured on the smart terminal, and/or The wireless communication module configured on the smart terminal is sent to the preset mobile terminal. For example, the user can receive the height information through his mobile phone and save it in the phone's notebook.

In the technical solution of the embodiment, the image of the user is acquired by the camera, and the distance between the user and the camera is measured, the height of the user is calculated and displayed to the user, and the problem of preparing the scale background by measuring the height of the camera is solved, thereby realizing convenient and quick measurement. The effect of height.

Embodiment 2

2 is a flowchart of a method for measuring a body height according to a second embodiment of the present invention. The technical solution of the embodiment is further refined on the basis of the foregoing embodiment. After the step 110, the method further includes:

Step 210: Perform edge detection on the image to obtain an edge detection map.

Wherein, the edge detection is performed on the image acquired by the camera. For example, the CANNY method, the SOBEL method, the ROBERTS method or the PREWITT method may be used to perform edge detection on the image. The edge detection map is in progress An image obtained by edge line drawing after edge detection.

Step 220: Acquire a head contour and a foot contour of the human body according to the edge detection map.

Wherein, in the edge detection map, the contour lines of the human body are screened, and whether the head contour and the foot contour are included in the contour line of the human body are determined.

Step 230: When the image includes both the head contour and the foot contour of the human body, determine that the user image in the image is a whole body image.

Optionally, after step 220, the method further includes:

Determining that the user image in the image is a non-body image when at least one of the head contour and the foot contour does not exist in the image;

Prompt the user to move away from the camera according to the preset prompt.

The preset prompting manner may be: displaying a prompt text and a prompt graphic through a display screen configured on the smart terminal, and/or playing the prompt voice through an audio output device configured on the smart terminal.

The technical solution of the embodiment obtains the user image contour in the image by performing edge detection on the image acquired by the camera, and measures the height and display of the user when determining that the user image in the image is a whole body image, thereby achieving convenient and quick access. The effect of the user's height.

Embodiment 3

FIG. 3 is a flowchart of a method for measuring a body height according to a third embodiment of the present invention. The technical solution of the embodiment is further refined based on the foregoing embodiment. Before step 130, the method further includes:

Step 310: Determine, according to the head contour, a first pixel point in the image sensor corresponding to the highest point of the user's head in the image.

Step 320: Determine, according to the contour of the foot, a second pixel point in the image sensor corresponding to the lowest point of the user's foot in the image.

The image sensor in the camera is arranged by a certain number of pixel points, and the image acquired by the camera is a bitmap, that is, an image formed by combining a corresponding number of pixels, after acquiring the contour of the user's head, Determining the pixel of the highest point of the user's head in the image, and then determining the corresponding pixel point in the image sensor, determining the pixel point as the first pixel point, and similarly determining the second pixel point.

Step 330: The distance between the first pixel point and the second pixel point in the vertical direction is taken as the imaging height of the user's whole body on the image sensor of the camera.

Wherein, after determining the first pixel point and the second pixel point, the number of pixel rows in which the first pixel point and the second pixel point are vertically spaced in the image sensor may be determined, and each row of pixels in the image sensor The spacing between the points is determined, so the distance between the first pixel and the second pixel can be determined, ie the imaging height of the user's entire body on the image sensor of the camera is determined.

Optionally, before step 110, the method further includes:

Obtain a height measurement instruction;

When the height measurement instruction is acquired, an operation of acquiring an image is performed.

Wherein, the height measurement instruction is input to the intelligent terminal by the preset instruction input mode, and the user can input the height by clicking a button for starting measurement, a voice instruction, a gesture instruction, and/or other terminal device capable of communicating with the intelligent terminal for measuring the height. Measurement instruction. For example, the smart terminal for measuring the height is a smart mirror, including: a mirror surface, a display screen, a CPU (Central Processing Unit) module, a camera, a ranging sensor, and a Bluetooth module. The CPU module is connected to the display screen, the camera, the ranging sensor and the Bluetooth module respectively. The smart mirror is connected with the Bluetooth-enabled weight scale via Bluetooth. When the user uses the Bluetooth-enabled weight scale to weigh the weight, the scale is intelligently transmitted via Bluetooth. The mirror sends a height measurement command, and the smart mirror measures the user's height.

The technical solution of the embodiment is to determine the highest point of the user's head and the lowest point of the foot in the image sensing The corresponding pixel in the device determines the imaging height of the user on the image sensor, so that the height of the user can be calculated according to the optical imaging law.

Embodiment 4

4 is a schematic structural diagram of a human body height measuring device according to Embodiment 4 of the present invention, and the device specifically includes:

An image obtaining module 410, configured to acquire an image by using a camera;

The human body distance measuring module 420 is configured to obtain a distance between the user and the lens of the camera through the ranging sensor when the user image in the image is a whole body image;

The height calculation module 430 is configured to calculate the height of the user according to the distance between the user and the lens of the camera, the distance between the lens of the camera and the image sensor, and the imaging height of the user on the image sensor of the camera;

The height display module 440 is configured to display the height of the user to the user according to a preset display manner.

Optionally, the human body height measuring device further comprises:

An image edge detection module is configured to perform edge detection on the image to obtain an edge detection map;

a contour acquisition module, configured to acquire a head contour and a foot contour of the human body according to the edge detection map;

The whole body image determining module is configured to determine that the user image in the image is a whole body image when the image includes both the head contour and the foot contour of the human body.

Optionally, the human body height measuring device further comprises:

a first pixel point determining module, configured to determine, according to a head contour, a first pixel point in an image sensor corresponding to a highest point of a user head in the image;

a second pixel point determining module, configured to determine, according to the foot contour, a second pixel point in the image sensor corresponding to a lowest point of the user foot in the image;

An imaging height determining module is configured to use a distance in a vertical direction between the first pixel point and the second pixel point as an imaging height of the user's whole body on the image sensor of the camera.

Optionally, the human body height measuring device further comprises:

a non-full body image determining module, configured to determine that the user image in the image is a non-body image when at least one of the head contour and the foot contour does not exist in the image;

The mobile prompting module is configured to prompt the user to move away from the camera according to a preset prompt manner.

Optionally, the human body height measuring device further comprises:

a measurement instruction acquisition module, configured to acquire a height measurement instruction;

The operation execution module is configured to perform an operation of acquiring an image when the height measurement instruction is acquired.

In the technical solution of the embodiment, the image of the user is acquired by the camera, and the distance between the user and the camera is measured, the height of the user is calculated and displayed to the user, and the problem of preparing the scale background by measuring the height of the camera is solved, thereby realizing convenient and quick measurement. The effect of height.

Embodiment 5

FIG. 5 is a schematic front view of a smart mirror according to a fifth embodiment of the present invention. The smart mirror includes a mirror 510, a camera 520, and a distance measuring sensor 530, and further includes a human body height measuring device provided by the above embodiment. The human body height measuring device is connected to the camera 520 and the distance measuring sensor 530 respectively. The mirror surface 510 in FIG. 5 is exemplified by a rectangular mirror surface, but the mirror shape is not limited to a rectangle; and the setting positions of the camera 520 and the distance measuring sensor 530 are not limited. The position shown in Figure 5. Optionally, the mirror 510 is a plane mirror, and the lens optical axis direction of the camera 520 and the axial direction of the ranging sensor 530 are perpendicular to the mirror surface 510.

The above product can perform the method provided by any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

Note that the above are only the preferred embodiments of the present invention and the technical principles applied thereto. Those skilled in the art will appreciate that the invention is not limited to the specific embodiments described herein, and that various modifications, changes and substitutions may be made without departing from the scope of the invention. Therefore, the present invention has been described in detail by the above embodiments, but the present invention is not limited to the above embodiments, and other equivalent embodiments may be included without departing from the inventive concept. The scope is determined by the scope of the appended claims.

Claims (12)

A method for measuring a height of a human body, comprising: Obtain an image through the camera; When the user image in the image is a whole body image, the distance between the user and the lens of the camera is acquired by the ranging sensor; Calculating the height of the user according to the distance between the user and the lens of the camera, the distance between the lens of the camera and the image sensor, and the imaging height of the user on the image sensor of the camera; Displaying the height of the user to the user according to a preset display manner. The method according to claim 1, further comprising: after acquiring the image by the camera, the method further comprising: Performing edge detection on the image to obtain an edge detection map; Obtaining a head contour and a foot contour of the human body according to the edge detection map; When the image includes both the head contour and the foot contour of the human body, it is determined that the user image in the image is a whole body image. The method of claim 2, wherein the distance between the user and the lens of the camera, the distance between the lens of the camera and the image sensor, and the user's image sensor on the camera The imaging height, before calculating the user's height, also includes: Determining, according to the head profile, a first pixel point in the image sensor corresponding to a highest point of a user's head in the image; Determining, according to the foot profile, a second pixel point in the image sensor corresponding to a lowest point of a user foot in the image; The distance between the first pixel point and the second pixel point in the vertical direction is taken as the user The imaging height on the image sensor of the camera. The method according to claim 2, further comprising: after acquiring the head contour and the foot contour of the human body according to the edge detection map, further comprising: Determining that the user image in the image is a non-whole body image when at least one of the head contour and the foot contour does not exist in the image; The user is prompted to move in a direction away from the camera according to a preset prompt manner. The method according to claim 1, wherein before the image is acquired by the camera, the method further comprises: Obtain a height measurement instruction; When the height measurement instruction is acquired, an operation of acquiring an image is performed. A human body height measuring device, comprising: An image acquisition module, configured to acquire an image by using a camera; a human distance measuring module, configured to acquire a distance between a user and a lens of the camera by using a ranging sensor when the user image in the image is a whole body image; a height calculation module for calculating a height of the user according to a distance between the user and the lens of the camera, a distance between the lens of the camera and the image sensor, and an imaging height of the user on the image sensor of the camera; The height display module is configured to display the height of the user to the user according to a preset display manner. The device according to claim 6, further comprising: An image edge detection module, configured to perform edge detection on the image to obtain an edge detection map; a contour acquiring module, configured to acquire a head contour and a foot contour of the human body according to the edge detection map; The whole body image determining module is configured to determine that the user image in the image is a whole body image when the image includes a head contour and a foot contour of the human body. The device according to claim 7, further comprising: a first pixel point determining module, configured to determine, according to the head contour, a first pixel point in the image sensor corresponding to a highest point of a user head in the image; a second pixel point determining module, configured to determine, according to the foot contour, a second pixel point in the image sensor corresponding to a lowest point of a user foot in the image; An imaging height determining module is configured to use a distance in a vertical direction between the first pixel point and the second pixel point as an imaging height of a user's whole body on an image sensor of the camera. The device according to claim 7, further comprising: a non-full body image determining module, configured to determine, when the at least one of the head contour and the foot contour does not exist in the image, the user image in the image is a non-body image; The mobile prompting module is configured to prompt the user to move in a direction away from the camera according to a preset prompt manner. The device according to claim 6, further comprising: a measurement instruction acquisition module, configured to acquire a height measurement instruction; And an operation execution module, configured to perform an operation of acquiring an image when the height measurement instruction is acquired. A smart mirror comprising a mirror, a camera and a distance measuring sensor, characterized by further comprising: the human body height measuring device according to any one of claims 6-10. The smart mirror of claim 1 wherein: The mirror surface is a plane mirror; The lens optical axis direction of the camera and the axial direction of the ranging sensor are both perpendicular to the mirror surface.

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