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WO2020223881A1 - Procédé et appareil de détection d'empreinte digitale, et dispositif électronique - Google Patents

Procédé et appareil de détection d'empreinte digitale, et dispositif électronique Download PDF

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Publication number
WO2020223881A1
WO2020223881A1 PCT/CN2019/085725 CN2019085725W WO2020223881A1 WO 2020223881 A1 WO2020223881 A1 WO 2020223881A1 CN 2019085725 W CN2019085725 W CN 2019085725W WO 2020223881 A1 WO2020223881 A1 WO 2020223881A1
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WIPO (PCT)
Prior art keywords
fingerprint
fingerprint image
partial
images
image
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2019/085725
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English (en)
Chinese (zh)
Inventor
谢良辉
丘芳芳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Goodix Technology Co Ltd
Original Assignee
Shenzhen Goodix Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Shenzhen Goodix Technology Co Ltd filed Critical Shenzhen Goodix Technology Co Ltd
Priority to CN201980000668.7A priority Critical patent/CN110268418B/zh
Priority to PCT/CN2019/085725 priority patent/WO2020223881A1/fr
Publication of WO2020223881A1 publication Critical patent/WO2020223881A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/1347—Preprocessing; Feature extraction

Definitions

  • This application relates to the field of optical fingerprint technology, and more specifically, to a fingerprint detection method, device and electronic device.
  • the application of the optical fingerprint device brings users a safe and convenient user experience.
  • the optical fingerprint device can adopt the principle of imaging through a small hole by a lens
  • the center of the pixel array of the optical fingerprint device is caused by the principle of optical imaging of the lens.
  • the amount of light in the area is larger than the amount of light in the edge area, which causes the signal amount in the center area of the fingerprint image to be greater than the signal amount in the edge area, that is, the center area of the fingerprint image is clear, the edge area is blurred, and the edges of the finger are easy.
  • the situation of poor contact makes the difference between the signal amounts of the two larger, and ultimately leads to a lower fingerprint recognition rate.
  • a fingerprint detection method, device and electronic equipment are provided, which can improve the fingerprint recognition rate.
  • a fingerprint detection method including:
  • optical parameters include at least one of exposure time and light intensity
  • the fingerprint image is obtained by the optical fingerprint sensor based on fingerprint detection signals
  • the exposure time is determined by The length of time for the optical fingerprint sensor to collect the fingerprint detection signal
  • the light intensity is the intensity of the light signal emitted by the excitation light source for fingerprint detection
  • the multiple partial fingerprint images are from different fingerprint images in the multiple fingerprint images, the areas of the multiple partial fingerprint images are at least partially non-overlapping, and the multiple partial fingerprint images correspond to different optical parameters.
  • the optical fingerprint sensor is configured to be arranged below the display screen of the electronic device to detect the fingerprint image of the human finger above the display screen, and the fingerprint detection signal is the light emitted by the excitation light source.
  • the signal is formed by reflection or scattering of the human finger above the display screen and passes through the display screen and is received by the optical fingerprint sensor.
  • the display screen is an OLED display screen
  • the fingerprint detection area of the optical fingerprint sensor is located in the display area of the OLED display screen
  • the excitation light source includes the OLED display screen in the Part of the display unit in the fingerprint detection area.
  • the partial fingerprint image is acquired by controlling the display unit of the OLED display screen corresponding to the partial fingerprint image to emit light and using the optical fingerprint sensor to collect; wherein, the exposure The duration corresponds to the light-emitting time of the display unit when used as the excitation light source, or the light intensity is the light-emitting light intensity of the display unit.
  • the separately collecting multiple fingerprint images based on multiple optical parameters includes: collecting at least one first fingerprint image based on at least one first exposure duration;
  • At least one second fingerprint image is collected.
  • the separately collecting multiple fingerprint images based on multiple optical parameters includes:
  • At least one second fingerprint image is collected.
  • the stitching based on multiple partial fingerprint images to obtain a target fingerprint image for fingerprint recognition includes: according to the partial fingerprint image in the first region of the at least one first fingerprint image, Determine the first sub-fingerprint image; determine the second sub-fingerprint image based on the partial fingerprint image in the second area of the at least one second fingerprint image; perform the process based on the first sub-fingerprint image and the second sub-fingerprint image Splicing to obtain the target fingerprint image.
  • the determining the first sub-fingerprint image according to the partial fingerprint image in the first region of the at least one first fingerprint image includes:
  • the at least one first fingerprint image includes a first fingerprint image, determining a partial fingerprint image in the first area of the first fingerprint image as the first sub-fingerprint image;
  • the at least one first fingerprint image includes a plurality of first fingerprint images, processing partial fingerprint images in the first area of the plurality of first fingerprint images to obtain the first sub-fingerprint image.
  • the processing partial fingerprint images in the first region of the plurality of first fingerprint images to obtain the first sub-fingerprint image includes:
  • the partial fingerprint images in the first region of the plurality of first fingerprint images are averaged, the maximum value is calculated, or the weighting process is performed according to a specific weight to obtain the first sub-fingerprint image.
  • the at least one first exposure duration is equal, or the at least one first exposure duration is not equal; or
  • the at least one second exposure duration is equal, or the at least one second exposure duration is different.
  • the multiple partial fingerprint images include a first partial fingerprint image and a second partial fingerprint image, and an area of the first partial fingerprint image is closer to the fingerprint than an area of the second partial fingerprint image In the central area of the image, the exposure time corresponding to the first partial fingerprint image is less than the exposure time corresponding to the second partial fingerprint image, or the light intensity corresponding to the first partial fingerprint image is less than that corresponding to the second partial fingerprint image The light intensity.
  • the target fingerprint image is obtained by splicing multiple sub-fingerprint images, and in the order of the multiple sub-fingerprint images and the center of the fingerprint image from far to near, the multiple sub-fingerprint images correspond to The exposure time decreases sequentially, or the light intensity corresponding to the multiple sub-fingerprint images decreases sequentially.
  • the multiple optical parameters are at least one of pixel values, saturation, contrast, and sharpness of fingerprint images collected according to pixel points in different regions in the pixel array of the optical fingerprint sensor definite.
  • the regions corresponding to the multiple partial fingerprint images are concentric circles or concentric rectangular rings.
  • a fingerprint detection device including:
  • An optical fingerprint sensor for separately collecting multiple fingerprint images based on multiple optical parameters, where the optical parameters include at least one of exposure time and light intensity, and the fingerprint image is obtained by the optical fingerprint sensor based on fingerprint detection signals ,
  • the exposure duration is the duration of the optical fingerprint sensor collecting the fingerprint detection signal
  • the light intensity is the intensity of the light signal emitted by the excitation light source for fingerprint detection
  • the processing module is used to splice multiple partial fingerprint images to obtain a target fingerprint image for fingerprint identification
  • the multiple partial fingerprint images are from different fingerprint images in the multiple fingerprint images, the areas of the multiple partial fingerprint images are at least partially non-overlapping, and the multiple partial fingerprint images correspond to different optical parameters.
  • the optical fingerprint sensor is configured to be arranged below the display screen of the electronic device to detect the fingerprint image of the human finger above the display screen, and the fingerprint detection signal is the light emitted by the excitation light source.
  • the signal is formed by reflection or scattering of the human finger above the display screen and passes through the display screen and is received by the optical fingerprint sensor.
  • the display screen is an OLED display screen
  • the fingerprint detection area of the optical fingerprint sensor is located in the display area of the OLED display screen
  • the excitation light source includes the OLED display screen in the Part of the display unit in the fingerprint detection area.
  • the partial fingerprint image is acquired by controlling the display unit of the OLED display screen corresponding to the partial fingerprint image to emit light and using the optical fingerprint sensor for collection, wherein the exposure The duration corresponds to the light-emitting time of the display unit when used as the excitation light source, or the light intensity is the light-emitting light intensity of the display unit.
  • the optical fingerprint sensor is specifically used for:
  • At least one second fingerprint image is collected.
  • the optical fingerprint sensor is specifically used for:
  • At least one second fingerprint image is collected.
  • the processing module is specifically configured to: determine the first sub-fingerprint image according to the partial fingerprint image in the first region of the at least one first fingerprint image;
  • the processing module is also used to:
  • the at least one first fingerprint image includes a first fingerprint image, determining a partial fingerprint image in the first area of the first fingerprint image as the first sub-fingerprint image;
  • the at least one first fingerprint image includes a plurality of first fingerprint images, processing partial fingerprint images in the first area of the plurality of first fingerprint images to obtain the first sub-fingerprint image.
  • the processing module is specifically configured to:
  • the partial fingerprint images in the first region of the plurality of first fingerprint images are averaged, the maximum value is calculated, or the weighting process is performed according to a specific weight to obtain the first sub-fingerprint image.
  • the at least one first exposure duration is equal, or the at least one first exposure duration is not equal; or
  • the at least one second exposure duration is equal, or the at least one second exposure duration is different.
  • the multiple partial fingerprint images include a first partial fingerprint image and a second partial fingerprint image, and an area of the first partial fingerprint image is closer to the fingerprint than an area of the second partial fingerprint image In the central area of the image, the exposure time corresponding to the first partial fingerprint image is less than the exposure time corresponding to the second partial fingerprint image, or the light intensity corresponding to the first partial fingerprint image is less than that corresponding to the second partial fingerprint image The light intensity.
  • the target fingerprint image is obtained by splicing multiple sub-fingerprint images, and in the order of the multiple sub-fingerprint images and the center of the fingerprint image from far to near, the multiple sub-fingerprint images correspond to The exposure time decreases sequentially, or the light intensity corresponding to the multiple sub-fingerprint images decreases sequentially.
  • the multiple optical parameters are at least one of pixel values, saturation, contrast, and sharpness of fingerprint images collected according to pixel points in different regions in the pixel array of the optical fingerprint sensor definite.
  • the regions corresponding to the multiple partial fingerprint images are concentric circles or concentric rectangular rings.
  • the device further includes:
  • the light source driving module is used to drive the excitation light source to respectively emit the light signals of the multiple light intensities to the fingerprint detection area.
  • the light source driving module is a display driving module or a display driver for driving the display screen for screen display.
  • a chip in a third aspect, includes an input and output interface, at least one processor, at least one memory, and a bus.
  • the at least one memory is used to store instructions
  • the at least one processor is used to call Instructions to execute the method in the first aspect or any possible implementation of the first aspect.
  • an electronic device including a display screen and a fingerprint detection device arranged below the display screen, wherein the fingerprint detection device is the second aspect or any possible implementation of the second aspect Fingerprint detection device in mode.
  • an electronic device including the chip as in the third aspect.
  • a computer-readable medium for storing a computer program, and the computer program includes instructions for executing the foregoing first aspect or any possible implementation of the first aspect.
  • a computer program product including instructions is provided.
  • the computer runs the instructions of the computer program product, the computer executes the first aspect or any one of the possible implementations of the first aspect. Fingerprint detection method.
  • the computer program product may run on the electronic device in the fourth aspect to the fifth aspect.
  • Fig. 1A is a directional view of an electronic device according to an embodiment of the present application.
  • Fig. 1B is a schematic diagram of a partial cross-sectional structure of the electronic device shown in Fig. 1A along A-A'.
  • Figure 2 is the change curve of the exposure time and the pixel value of the fingerprint image.
  • Fig. 3 is a schematic flowchart of a fingerprint detection method according to an embodiment of the present application.
  • Figures 4 to 11 are examples of fingerprint images acquired through different exposure durations, and then stitched to obtain target fingerprint images.
  • Fig. 12 is a signal distribution diagram of fingerprint images acquired based on a single exposure duration and based on multiple exposure durations.
  • Fig. 13 is a schematic block diagram of a fingerprint detection device according to an embodiment of the present application.
  • Fig. 14 is a schematic diagram of the system structure of a fingerprint detection device according to an embodiment of the present application.
  • Fig. 15 is a schematic diagram of the system structure of a fingerprint detection device according to another embodiment of the present application.
  • Fig. 16 is a schematic block diagram of an electronic device according to an embodiment of the present application.
  • the optical fingerprint system provided in the embodiments of this application can be applied to smart phones, tablet computers, and other mobile terminals with display screens or other terminal devices; more specifically, in the above-mentioned terminal devices, fingerprint identification
  • the device may specifically be an optical fingerprint device, which may be arranged in a partial area or an entire area under the display screen, thereby forming an under-display optical fingerprint system.
  • the fingerprint identification device can also be partially or fully integrated into the display screen of the terminal device, thereby forming an in-display optical fingerprint system.
  • FIG. 1A and 1B show schematic diagrams of electronic devices to which the embodiments of the present application can be applied, wherein FIG. 1 is a front schematic view of the electronic device 10, and FIG. 1B is a part of the electronic device 10 shown in FIG. 1A along AA' Schematic diagram of cross-sectional structure.
  • the electronic device 10 includes a display screen 120 and an optical fingerprint device 130, wherein the optical fingerprint device 130 is arranged in a partial area below the display screen 120.
  • the optical fingerprint device 130 includes an optical fingerprint sensor, and the optical fingerprint sensor includes a sensing array with a plurality of optical sensing units, and the area where the sensing array is located or the sensing area thereof is the fingerprint detection area 103 of the optical fingerprint device 130.
  • the fingerprint detection area 103 is located in the display area of the display screen 120.
  • the optical fingerprint device 130 may also be arranged in other positions, such as the side of the display screen 120 or the non-transmissive area at the edge of the electronic device 10, and the optical fingerprint device 130 may be designed to The optical signal of at least a part of the display area of the display screen 120 is guided to the optical fingerprint device 130, so that the fingerprint detection area 103 is actually located in the display area of the display screen 120.
  • the area of the fingerprint detection area 103 may be different from the area of the sensing array of the optical fingerprint device 130, for example, through optical path design such as lens imaging, reflective folding optical path design, or other optical path design such as light convergence or reflection, etc.
  • the area of the fingerprint detection area 103 of the optical fingerprint device 130 can be made larger than the area of the sensing array of the optical fingerprint device 130.
  • the fingerprint detection area 103 of the optical fingerprint device 130 may also be designed to be substantially the same as the area of the sensing array of the optical fingerprint device 130.
  • the electronic device 10 adopting the above structure does not need to reserve space on the front side for setting fingerprint buttons (such as the Home button), so that a full screen solution can be adopted, that is, the display area of the display screen 120 It can be basically extended to the front of the entire electronic device 10.
  • the optical fingerprint device 130 includes a light detecting part 134 and an optical component 132, and the light detecting part 134 includes the sensor array and is electrically connected to the sensor array.
  • the connected reading circuit and other auxiliary circuits can be fabricated on a chip (Die) by a semiconductor process, such as an optical imaging chip or an optical fingerprint sensor.
  • the sensing array is specifically a photodetector (Photodetector) array, which includes A plurality of photodetectors distributed in an array, the photodetector can be used as the optical sensing unit as described above; the optical component 132 can be arranged above the sensing array of the photodetecting part 134, which can specifically include The filter layer (Filter), the light guide layer or the light path guide structure and other optical elements, the filter layer can be used to filter out the ambient light penetrating the finger, and the light guide layer or the light path guide structure is mainly used to remove The reflected light reflected from the finger surface is guided to the sensing array for optical detection.
  • the filter layer Finter
  • the light guide layer or the light path guide structure is mainly used to remove The reflected light reflected from the finger surface is guided to the sensing array for optical detection.
  • the optical assembly 132 and the light detecting part 134 may be packaged in the same optical fingerprint component.
  • the optical component 132 and the optical detection part 134 can be packaged in the same optical fingerprint chip, or the optical component 132 can be arranged outside the chip where the optical detection part 134 is located, for example, the optical component 132 is attached above the chip, or some components of the optical assembly 132 are integrated into the chip.
  • the light guide layer or light path guiding structure of the optical component 132 has multiple implementation schemes.
  • the light guide layer may specifically be a collimator layer made on a semiconductor silicon wafer, which has multiple A collimating unit or a micro-hole array.
  • the collimating unit can be specifically a small hole.
  • the reflected light reflected from the finger the light that is perpendicularly incident on the collimating unit can pass through and be passed by the optical sensing unit below it.
  • the light with an excessively large incident angle is attenuated by multiple reflections inside the collimating unit. Therefore, each optical sensing unit can basically only receive the reflected light reflected by the fingerprint pattern directly above it.
  • the sensor array can detect the fingerprint image of the finger.
  • the light guide layer or the light path guide structure may also be an optical lens (Lens) layer, which has one or more lens units, such as a lens group composed of one or more aspheric lenses, which The sensing array used to converge the reflected light reflected from the finger to the light detection part 134 below it, so that the sensing array can perform imaging based on the reflected light, thereby obtaining a fingerprint image of the finger.
  • the optical lens layer may further have a pinhole formed in the optical path of the lens unit, and the pinhole may cooperate with the optical lens layer to expand the field of view of the optical fingerprint device to improve the optical The fingerprint imaging effect of the fingerprint device 130.
  • the light guide layer or the light path guide structure may also specifically adopt a micro-lens (Micro-Lens) layer.
  • the micro-lens layer has a micro-lens array formed by a plurality of micro-lenses, which can be grown by semiconductors.
  • a process or other processes are formed above the sensing array of the light detecting part 134, and each microlens may correspond to one of the sensing units of the sensing array.
  • other optical film layers may be formed between the microlens layer and the sensing unit, such as a dielectric layer or a passivation layer.
  • the microlens layer and the sensing unit may also include The light-blocking layer of the micro-hole, wherein the micro-hole is formed between the corresponding micro-lens and the sensing unit, the light-blocking layer can block the optical interference between the adjacent micro-lens and the sensing unit, and make the sensing
  • the light corresponding to the unit is condensed into the microhole through the microlens and is transmitted to the sensing unit through the microhole to perform optical fingerprint imaging.
  • a microlens layer can be further provided under the collimator layer or the optical lens layer.
  • the collimator layer or the optical lens layer is used in combination with the micro lens layer, its specific laminated structure or optical path may need to be adjusted according to actual needs.
  • the display screen 120 may be a display screen with a self-luminous display unit, such as an organic light-emitting diode (Organic Light-Emitting Diode, OLED) display or a micro-LED (Micro-LED) display Screen.
  • OLED Organic Light-Emitting Diode
  • the optical fingerprint device 130 may use the display unit (ie, an OLED light source) of the OLED display screen 120 located in the fingerprint detection area 103 as an excitation light source for optical fingerprint detection.
  • the display screen 120 can display a specific light spot in the fingerprint detection area to emit fingerprint excitation light to the target finger above the fingerprint detection area 103.
  • the fingerprint excitation light can be The surface of the finger is reflected to form reflected light or scattered inside the finger to form scattered light.
  • the above-mentioned reflected light and scattered light are collectively referred to as reflected light. Because the ridge and valley of the fingerprint have different light reflection capabilities, the reflected light from the fingerprint ridge and the emitted light from the fingerprint ridge have different light intensities. After the reflected light passes through the optical components, it is optically fingerprinted.
  • the sensing array in the device 130 receives and converts into a corresponding electrical signal, that is, a fingerprint detection signal; based on the fingerprint detection signal, fingerprint image data can be obtained, and fingerprint matching verification can be further performed, thereby implementing the electronic device 10 Optical fingerprint recognition function.
  • the optical fingerprint device 130 may also use a built-in light source or an external light source to provide an optical signal for fingerprint detection.
  • the optical fingerprint device 130 may be suitable for non-self-luminous display screens, such as liquid crystal display screens or other passively-luminous display screens.
  • the optical fingerprint system of the electronic device 10 may also include an excitation light source for optical fingerprint detection.
  • the excitation light source may specifically be an infrared light source or a light source of non-visible light of a specific wavelength, which may be arranged under the backlight module of the liquid crystal display or in the edge area under the protective cover of the electronic device 10, and the The optical fingerprint device 130 can be arranged under the edge area of the liquid crystal panel or the protective cover and guided by the light path so that the fingerprint detection light can reach the optical fingerprint device 130; or, the optical fingerprint device 130 can also be arranged in the backlight module. Under the group, and the backlight module is designed to allow the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the optical fingerprint device 130 through openings or other optical designs on the film layers such as diffuser, brightness enhancement film, and reflective film. .
  • the optical fingerprint device 130 adopts a built-in light source or an external light source to provide an optical signal for fingerprint detection, the detection principle is the same as that described above.
  • the electronic device 10 further includes a transparent protective cover, and the cover may be a glass cover or a sapphire cover, which is located above the display screen 120 and covers the electronic The front of the device 10. Because, in the embodiment of the present application, the so-called finger pressing on the display screen 120 actually refers to pressing on the cover plate above the display screen 120 or covering the surface of the protective layer of the cover plate.
  • the optical fingerprint device 130 may include only one optical fingerprint sensor.
  • the fingerprint detection area 103 of the optical fingerprint device 130 has a small area and a fixed position, so the user is performing fingerprint input At this time, it is necessary to press the finger to a specific position of the fingerprint detection area 103, otherwise the optical fingerprint device 130 may not be able to collect fingerprint images, resulting in poor user experience.
  • the optical fingerprint device 130 may specifically include multiple optical fingerprint sensors; the multiple optical fingerprint sensors may be arranged side by side under the display screen 120 in a splicing manner, and the multiple optical fingerprint sensors The sensing area of the fingerprint sensor together constitutes the fingerprint detection area 103 of the optical fingerprint device 130.
  • the fingerprint detection area 103 of the optical fingerprint device 130 may include multiple sub-areas, and each sub-area corresponds to the sensing area of one of the optical fingerprint sensors, so that the fingerprint collection area 103 of the optical fingerprint device 130 It can be extended to the main area of the lower half of the display screen, that is, extended to the area where the finger is habitually pressed, so as to realize the blind fingerprint input operation.
  • the fingerprint detection area 130 can also be extended to half of the display area or even the entire display area, thereby realizing half-screen or full-screen fingerprint detection.
  • optical fingerprint device in the embodiments of the present application may also be referred to as an optical fingerprint identification module, fingerprint device, fingerprint identification device, fingerprint identification module, fingerprint module, fingerprint acquisition device, etc.
  • the amount of light in the center area of the pixel array (corresponding to the sensor array described above) of the optical fingerprint device is larger than the amount of light in the edge area.
  • the signal amount in the center area of the fingerprint image is larger than the signal amount in the edge area, that is to say, the center area of the fingerprint image is clear, the edge area is blurred, and the edges of the finger are prone to poor contact, which makes the signal amount of both The gap is larger, which ultimately leads to a lower fingerprint recognition rate.
  • Figure 2 shows the relationship between the exposure time used to collect the fingerprint image and the pixel value of the collected fingerprint image.
  • the curve shows that within a certain exposure time range, the exposure time and the pixel value have a linear relationship. Beyond this linear range, the pixel value of the fingerprint image enters the saturation zone, and the fingerprint image in the linear range is effective.
  • the light input in the central area is usually larger than the light input in the edge area. This causes the signal volume in the central area to increase faster than the signal volume in the edge area during fingerprint collection. If a smaller exposure is used The fingerprint collection time can ensure that the pixel value in the center area is within the linear range, but the signal amount in the edge area is smaller. If a larger exposure time is used for fingerprint collection, the signal amount in the edge area can be improved, but the signal amount in the center area can be improved. The signal will enter the saturation zone ahead of time, which will cause the fingerprint image of the collected center area to fail.
  • the embodiment of the present application provides a fingerprint detection scheme, which collects fingerprint images through different exposure times, and further stitches the effective partial fingerprint images in the collected fingerprint images to obtain the target fingerprint image, and then uses the Fingerprint recognition is performed on the target fingerprint image, thereby improving the fingerprint recognition rate.
  • FIG. 3 is a schematic flowchart of a fingerprint detection method according to an embodiment of the present application. It should be understood that the fingerprint detection method 300 may be applied to a fingerprint detection device or an electronic device. As shown in FIG. 3, the fingerprint detection method 300 may include the following content:
  • S310 Collect multiple fingerprint images based on multiple optical parameters, where the optical parameters include at least one of exposure time and light intensity;
  • S320 Perform stitching according to multiple partial fingerprint images to obtain a target fingerprint image for fingerprint identification, where the multiple partial fingerprint images are from different fingerprint images among the multiple fingerprint images, and the multiple partial fingerprint images The regions of the image are at least partially non-overlapping, and the multiple partial fingerprint images correspond to different exposure durations.
  • the exposure time may correspond to the optical parameters of the optical fingerprint sensor
  • the light intensity may correspond to the optical parameters of the excitation light source used for fingerprint detection.
  • the embodiment of the present application may also be based on other optical fingerprint sensors and other optical parameters of the excitation light source. Parameters to collect multiple fingerprint images.
  • the fingerprint detection device 500 may be disposed under the display screen 200 of the electronic device, and the display screen 200 may correspond to the display screen 120 shown in FIG. 1, and the fingerprint detection area 230 of the display screen 200 It may be the fingerprint detection area 103 shown in FIG. 1.
  • the display screen 200 may specifically be a self-luminous display (such as an OLED display), and it includes a plurality of self-luminous display units 201 (such as OLED pixels or OLED light sources).
  • the self-luminous display unit 201 is configured to emit light under the driving of the display driving module to make the display screen 200 display a corresponding screen.
  • part of the self-luminous display unit 201 of the display screen 200 located in the fingerprint detection area 230 may be used as an excitation light source for the fingerprint detection device 20 to perform fingerprint detection, and is used to The fingerprint detection area 230 emits light signals to form a predetermined pattern of light spots in the fingerprint detection area 230.
  • the partial fingerprint image in the implementation of this application may be obtained by controlling the OLED display screen to emit light on a display unit corresponding to the partial fingerprint image and using the optical fingerprint sensor for collection, wherein the exposure time is equal to The light-emitting time of the display unit when used as the excitation light source corresponds to that, or the light intensity is the light-emitting light intensity of the display unit.
  • the external light source 540 may also be arranged under the display screen 200 and used to emit light signals to the fingerprint detection area 230 of the display screen 200 to form a light spot with a preset pattern in the fingerprint detection area 230.
  • the intensity of the light signal emitted by the excitation light source may be driven by a light source driving module to display the predetermined pattern of light spots in the fingerprint detection area 230.
  • the excitation light source may include a red light source, a green light source, and a blue light source, for example, the red display of the display screen 200 Unit, the green display unit and the blue display unit, through the display drive module of the display screen to control the optical parameters such as the ratio and/or gray value of the light signals emitted by the three light sources, and can be controlled to the fingerprint detection area 230 The intensity of the emitted light signal.
  • the light intensity used for fingerprint collection in the embodiment of the present application may be the light intensity of the light signal emitted by the excitation light source.
  • the light intensity can be determined by controlling the light signal emitted by the red light source, the green light source and the blue light source in the excitation light source.
  • Optical parameters such as ratio and/or gray value are controlled.
  • the greater the light intensity the greater the pixel value in the captured fingerprint image; conversely, the smaller the light intensity, the smaller the pixel value in the captured fingerprint image. Therefore, by collecting multiple fingerprint images with different light intensities, it is further possible to stitch the partial fingerprint images with pixel values at the same level in the multiple fingerprint images to obtain a complete target fingerprint image.
  • the exposure time in the embodiments of the present application refers to the time required for the shutter to open in order to incident the fingerprint detection signal on the sensing array of the fingerprint sensor, where the fingerprint detection signal is formed in the fingerprint detection area of the display screen.
  • the light signal corresponding to the predetermined pattern is reflected or scattered by the user’s finger.
  • the longer the exposure time the greater the amount of light signals entering the sensing array, and accordingly, the greater the pixel value of the fingerprint image collected by the fingerprint sensor.
  • different regions in the pixel array correspond to different linear ranges
  • the fingerprint image collected based on an exposure time only the fingerprint image in a specific region is valid, that is, The pixel value of the fingerprint image in the specific area is within the linear range, and the specific area is marked as the effective data area or the effective image area.
  • one exposure duration can correspond to an effective image area
  • fingerprint images are collected based on the exposure duration
  • the target fingerprint image can be further stitched according to partial fingerprint images in the effective image area of the fingerprint image.
  • the first fingerprint image can be collected by the first light intensity
  • the second fingerprint image can be collected by the second light intensity, where the first light is stronger than the second light intensity, because for the fingerprint images collected with the same light intensity,
  • the signal amount of the fingerprint image in the edge area is smaller than the signal amount in the center area. Therefore, in one implementation, when the target fingerprint image is spliced, the partial fingerprint image in the edge area in the first fingerprint image can be combined with Partial fingerprint images in the central area of the second fingerprint image are spliced to obtain the target fingerprint image.
  • the fingerprint image collected based on a specific light intensity it can also be considered that only the fingerprint image of a specific area is effective.
  • the central area of the fingerprint image with a smaller light intensity can be considered Is effective
  • the edge area of the fingerprint image with larger light intensity can be considered effective. That is, it can also be considered that one light intensity can correspond to an effective image area, the fingerprint image is collected based on the light intensity, and the target fingerprint image can be further stitched according to the partial fingerprint image in the effective image area of the fingerprint image.
  • the fingerprint detection device can collect multiple fingerprint images based on multiple exposure durations or multiple light intensities. Different exposure durations or light intensities can be considered as corresponding to different effective image areas, and further can be based on the The partial fingerprint images in the effective image area of multiple fingerprint images are spliced to obtain a complete target fingerprint image. Since the target fingerprint image is spliced from the partial fingerprint images in the effective image area, the signal of the entire frame of fingerprint image can be improved To increase the fingerprint recognition rate.
  • different exposure durations or light intensities can be used to collect fingerprint images, and further, partial fingerprint images in partial areas of fingerprint images can be spliced to obtain target fingerprint images for fingerprint recognition. That is to say, the target fingerprint image can be from fingerprint images collected with different exposure time or light intensity, which is beneficial to solve the problem of low fingerprint recognition rate caused by different linear ranges corresponding to different regions of the pixel array.
  • the embodiment of the present application can also perform fingerprint images based on multiple other parameters, which can affect the pixel values of the collected fingerprint images, for example, the grayscale, color, and degree of dispersion of the optical signal used for fingerprint collection. This embodiment of the application does not limit this.
  • the fingerprint collection is performed based on multiple light intensities, and based on the multiple fingerprint images collected.
  • stitching to obtain the target fingerprint image is similar, and will not be repeated here.
  • the multiple partial fingerprint images may be directly stitched to obtain the target fingerprint image.
  • the plurality of fingerprint images includes a first fingerprint image and a second fingerprint image
  • the plurality of partial fingerprint images may include a first partial fingerprint image from the first fingerprint image and a second partial fingerprint image from the second fingerprint image Fingerprint image, wherein the first partial fingerprint image and the second partial fingerprint image can correspond to different regions in the fingerprint image, and the first partial fingerprint image and the second partial fingerprint image can be directly spliced to obtain the Target fingerprint image.
  • the multiple partial fingerprint images may also be processed to obtain multiple sub-fingerprint images, and the multiple sub-fingerprint images are further spliced to obtain the target fingerprint image.
  • the partial fingerprint image in the target fingerprint image is called a sub-fingerprint image.
  • the sub-fingerprint image can be from the partial fingerprint image in the collected fingerprint image, or it can also be the partial fingerprint image in the collected fingerprint image After processing. That is, the sub-fingerprint image may be a partial fingerprint image, or may also be other fingerprint images obtained by processing multiple partial fingerprint images.
  • the plurality of fingerprint images include a first fingerprint image, a second fingerprint image, and a third fingerprint image
  • the plurality of partial fingerprint images include a first partial fingerprint image from the first fingerprint image, and a second fingerprint image from the The second partial fingerprint image and the third partial fingerprint image from the third fingerprint image, where the first partial fingerprint image corresponds to the first area in the fingerprint image, and both the second partial fingerprint image and the third partial fingerprint image can correspond
  • the second area in the fingerprint image for example, the second fingerprint image and the third fingerprint image may be collected based on the same exposure time.
  • the display unit of the OLED display screen when used as the excitation light source for fingerprint detection, in order to obtain the first partial fingerprint image of the first fingerprint image, it can be controlled to be in contact with the first partial fingerprint image.
  • the corresponding OLED display unit emits light, while the OLED display units in other areas do not emit light, and the optical fingerprint sensor is used for fingerprint image collection, thereby obtaining the first partial fingerprint image of the first fingerprint image; similarly,
  • the OLED display of the second partial fingerprint image and the third partial fingerprint image of the third fingerprint image it is also possible to control the OLED display of the second partial fingerprint image and the third partial fingerprint image respectively.
  • the units emit light respectively and use the optical fingerprint sensor to collect fingerprint images.
  • the exposure time for acquiring the partial fingerprint image may correspond to the light-emitting time of the OLED display unit when it is used as the excitation light source.
  • the optical fingerprint sensor when the optical fingerprint sensor collects the first partial fingerprint image, the second partial fingerprint image, and the third partial fingerprint image, it may only be enabled with the above partial fingerprint image.
  • the corresponding sensing unit performs optical signal detection and collection.
  • the light emission of the display unit of the OLED display screen as the excitation light source for fingerprint detection can be controlled in a common control mode without special light emission control.
  • the OLED display unit used for fingerprint detection in order to obtain the first partial fingerprint image of the first fingerprint image, the OLED display unit used for fingerprint detection can be controlled to emit light, and the sensing unit in the first area of the optical fingerprint sensor can be activated to collect the fingerprint image, thereby The first partial fingerprint image is obtained, and for the second partial fingerprint image, the third partial fingerprint image is obtained in a similar manner.
  • the OLED display unit used for fingerprint detection may be controlled to emit light, and the optical fingerprint sensor may be activated to collect fingerprint images, thereby obtaining To the first fingerprint image, further, extracting the partial fingerprint image in the first region of the first fingerprint image to obtain the first partial fingerprint image, for the second partial fingerprint image, the third partial The fingerprint image acquisition method is similar.
  • the exposure duration of the partial fingerprint image corresponding to the light emission time when the light source is excited may be that when the partial fingerprint image is collected, the exposure duration of the partial fingerprint image is within the Within the range of the light emission duration of the excitation light source, for example, the exposure duration is equal to the light emission duration, or the exposure duration is less than the light emission duration.
  • the target fingerprint image is obtained by splicing the first sub-fingerprint image and the second sub-fingerprint image, where the first sub-fingerprint image corresponds to the first area, and the second sub-fingerprint image corresponds to the second sub-fingerprint image. area.
  • the first sub-fingerprint image may be the first partial fingerprint image
  • the second sub-fingerprint image may be determined according to the second partial fingerprint image and the third partial fingerprint image.
  • the pixel values of the corresponding pixels in the second partial fingerprint image and the third partial fingerprint image are averaged, or weighted according to a specific weight, to obtain the second sub-fingerprint image.
  • the multiple exposure durations may be completely different, or the multiple exposure durations may also be partially the same, which is not limited in the embodiment of the present application.
  • multiple fingerprint images may be collected based on different exposure durations, and then partial fingerprint images in the effective image areas of the multiple fingerprint images may be stitched to obtain the target fingerprint image.
  • At least two fingerprint images may also be collected based on at least two identical exposure durations
  • the sub-fingerprint image corresponding to the effective image area may be determined based on the partial fingerprint images in the effective image area of the at least two fingerprint images
  • the The sub-fingerprint image is spliced into the corresponding area of the target fingerprint image, that is, the sub-fingerprint image in the local area can be determined based on the same exposure time.
  • the S310 may include:
  • the first exposure time period is different from the second exposure time period.
  • the S310 may include:
  • At least one second fingerprint image is collected.
  • the stitching based on multiple partial fingerprint images to obtain a target fingerprint image for fingerprint identification includes:
  • the exposure corresponding to the first partial fingerprint image The duration is less than the exposure duration corresponding to the second partial fingerprint image, that is, the first exposure duration is less than the second exposure duration, that is to say, the effective image area corresponding to the smaller exposure duration is closer to the central area and larger
  • the effective exposure area corresponding to the exposure time of is closer to the edge area.
  • the first partial fingerprint image corresponds to The light intensity is smaller than the light intensity corresponding to the second partial fingerprint image, that is, the effective image area corresponding to the smaller light intensity is closer to the central area, and the effective exposure area corresponding to the larger light intensity is closer to the edge area.
  • a smaller exposure time or light intensity can be used to collect the fingerprint image with the effective image area as the central area.
  • the fingerprint image of the central area with a larger amount of light can be in the linear region, and Larger exposure time or light intensity collects the fingerprint image where the effective image area is the edge area, so that the signal amount in the edge area can be increased, and the signal amount in the center area and the edge area can reach a considerable level, compared to the entire frame.
  • the clarity of the fingerprint image can improve the fingerprint recognition rate.
  • the multiple sub-fingerprint images and the center of the fingerprint image are in the order from far to near.
  • the exposure time corresponding to each sub-fingerprint image decreases sequentially, or the light intensity corresponding to the multiple sub-fingerprint images decreases sequentially.
  • the shorter the exposure time corresponding to the sub-fingerprint image closer to the center area is, for example, as shown in FIG. 5, the three sub-fingerprint images follow the order from edge to center.
  • the corresponding exposure time or light intensity is sequentially reduced, so that the exposure time or light intensity can be matched with the amount of light in the corresponding area, so that the signal volume of the entire area is at a considerable level, thereby ensuring the clarity of the entire frame of the fingerprint image, and then Improve fingerprint recognition rate.
  • fingerprint image 1 can be collected based on exposure time 1.
  • the effective image area corresponding to exposure time 1 is the area where partial fingerprint image 1 is located. At this time, it is only necessary to ensure that the pixel values in partial fingerprint image 1 are in the linear range. That is, there is no need to consider whether the fingerprint images in other regions are in the linear range.
  • the fingerprint image 2 is collected based on the exposure duration 2.
  • the effective image area corresponding to the exposure duration 2 is the area where the partial fingerprint image 2 is located. At this time, it is only necessary to ensure that the pixel values in the partial fingerprint image 2 are in the linear range, and no other considerations are required. Whether the fingerprint image in the area is in the linear range. Then the partial fingerprint image 1 and the partial fingerprint image 2 are stitched together to obtain the target fingerprint image.
  • the exposure duration 1 may be less than the exposure duration 2.
  • the partial fingerprint image 1 may be a partial fingerprint image of the central area of the fingerprint image 1
  • the partial fingerprint image 2 may be the fingerprint A partial fingerprint image of the edge area of image 2.
  • the target fingerprint image may come from four local areas of four fingerprint images, and the exposure time used to collect the four fingerprint images may be based on the four local areas.
  • the linear range of pixels is determined. Although this embodiment does not distinguish between the center area and the edge area, it takes into account the linear range of each pixel in the entire pixel array, and takes into account the linear range of each pixel in the local area. The linear range is easier to implement, and to a certain extent, the quality of the fingerprint image in each local area can be improved, thereby improving the quality of the entire frame of the fingerprint image.
  • the S310 includes:
  • At least two second fingerprint images are collected.
  • the stitching based on multiple partial fingerprint images to obtain a target fingerprint image for fingerprint identification includes:
  • the at least two first exposure durations are equal, or the at least two first exposure durations may also be unequal.
  • the at least two second exposure durations are equal, or the at least two second exposure durations may also be unequal.
  • the first area is an effective image area corresponding to the first exposure duration
  • the second area is an effective image area corresponding to the second exposure duration
  • the sub-fingerprint image used to splice the target fingerprint image may be a partial fingerprint image from the fingerprint image, or may be obtained by processing multiple partial fingerprint images.
  • the determining the first sub-fingerprint image according to the partial fingerprint images in the first region of the at least two first fingerprint images includes:
  • the partial fingerprint images in the first region of the at least two first fingerprint images are processed to obtain the first sub-fingerprint image.
  • the partial fingerprint images in the first area of the at least two first fingerprint images are averaged, the maximum value is calculated, or weighted according to a specific weight, etc., to obtain the first sub-fingerprint image .
  • the partial fingerprint images in the second area of the at least two second fingerprint images may be averaged, the maximum value may be calculated, or the weighting process may be performed according to a specific weight to obtain the second sub-fingerprint image , I won’t repeat it here.
  • three first fingerprint images can be collected based on exposure time 1, exposure time 2 and exposure time 3, and three second fingerprint images can be collected based on exposure time 4, exposure time 5 and exposure time 6. It is further possible to determine the first sub-fingerprint image according to the partial fingerprint images in the first area of the three first fingerprint images, and to determine the second sub-fingerprint image according to the partial fingerprint images in the second area of the three second fingerprint images Image, and then the first sub-fingerprint image and the second fingerprint image can be spliced to obtain the target fingerprint image.
  • the exposure time length 1, the exposure time length 2 and the exposure time length 3 may be equal or different.
  • the exposure time length 1, the exposure time length 2 and the exposure time length 3 may correspond to the same effective image area, that is, in The pixel points in the effective image area are based on the exposure duration 1, and the pixel values collected by the exposure duration 2 and the exposure duration 3 are all within the linear range.
  • the exposure duration 4 the exposure duration 5 and the exposure duration 6, which will not be repeated here.
  • the fingerprint detection device may collect multiple complete fingerprint images based on multiple exposure durations. In other embodiments, it may also collect multiple partial fingerprint images based on multiple exposure durations.
  • the partial fingerprint image is the fingerprint image in the effective image area corresponding to the exposure time.
  • the complete fingerprint image 1 and fingerprint image 2 can be collected based on exposure time length 1 and exposure time length 2, and then partial fingerprint images in fingerprint image 1 and fingerprint image 2 can be used for stitching
  • partial fingerprint image 1 and partial fingerprint image 2 can be collected based on exposure time length 1 and exposure time length 2, where the partial fingerprint image 1 is the fingerprint in the effective image area corresponding to the exposure time length 1.
  • Image the partial fingerprint image 2 is the fingerprint image in the effective image area corresponding to the exposure duration 2.
  • only some pixels in the pixel array need to be turned off, for example, the partial fingerprint image 1 is turned off
  • the partial fingerprint image 2 is collected, the pixels in other areas are turned off, which can reduce the power consumption of fingerprint collection.
  • fingerprint images in the above embodiment is only an example. In the embodiment of this application, other fingerprint images may also be collected to determine the target fingerprint image, for example, 4, 5 or more. Many, see the examples in Figures 5-10.
  • the number of the multiple partial fingerprint images or the number of effective image areas described above is only an example, and the embodiment of the present application is not particularly limited to this.
  • more partial fingerprint images can be spliced .
  • To obtain the target fingerprint image for example, 3 (as shown in FIG. 5 to FIG. 8) or more (as shown in FIG. 9 or FIG. 10).
  • the embodiment of the present application does not particularly limit the shape of the area (or effective image area) corresponding to the partial fingerprint image used to stitch the target fingerprint image, for example, it may be a circle, a triangle, a rectangle, or Other regular or irregular shapes, as shown in Figures 5-10.
  • it may be determined to collect a part of the fingerprint image according to at least one of the pixel value, saturation, contrast, and sharpness of the fingerprint image collected by the pixel points in the different areas of the pixel array of the optical fingerprint sensor.
  • the optical parameters of the fingerprint image may be determined to collect a part of the fingerprint image according to at least one of the pixel value, saturation, contrast, and sharpness of the fingerprint image collected by the pixel points in the different areas of the pixel array of the optical fingerprint sensor.
  • the pixel array can be divided into multiple regions, for example, the pixel array can be divided into multiple regions according to the sensitivity of different regions in the pixel array.
  • the fingerprint image can be collected through multiple exposure durations, and the pixel values of the fingerprint images collected by the pixels in the multiple regions and the change curves of the multiple exposure durations can be established.
  • Each region can correspond to a change curve, for example, as shown in the figure As shown in 2, then according to the change curve, the exposure duration of the partial fingerprint image collected in the region is determined, and the partial fingerprint image of the region in the fingerprint image collected based on the exposure duration can be further used to stitch the target fingerprint image.
  • Fig. 12 shows a signal distribution diagram of a fingerprint image obtained by using a single exposure duration and using multiple exposure durations for fingerprint image acquisition.
  • multiple first exposure durations are used to collect multiple frames of first fingerprint images.
  • multiple fingerprint images are acquired based on exposure duration 1, exposure duration 2, and exposure duration 3, and based on Multiple second exposure durations, multiple frames of second fingerprint images are collected, for example, as shown in FIG. 11 based on exposure duration 4, exposure duration 5, and exposure duration 6, multiple fingerprint images are collected, and the multiple frames of first fingerprint images are further collected
  • the image and the multiple frames of second fingerprint images are spliced to obtain a target fingerprint image, that is, a combined fingerprint image.
  • the fingerprint image is collected using multiple exposure durations, and the target fingerprint image obtained by stitching (corresponding to the combined result in the figure) is relative to the fingerprint image collected with a single exposure duration.
  • the amount has been increased, and the clarity of the entire frame of the fingerprint image is optimized, thereby improving the fingerprint recognition rate.
  • the False Rejection Rate (FRR) index is optimized by 2 to 3%.
  • the fingerprint detection device 500 may include:
  • the optical fingerprint sensor 510 is configured to collect multiple fingerprint images based on multiple optical parameters, where the optical parameters include at least one of exposure time and light intensity, and the fingerprint image is based on fingerprint detection by the optical fingerprint sensor. Obtained by the signal, the exposure duration is the duration of the optical fingerprint sensor collecting the fingerprint detection signal, and the light intensity is the intensity of the light signal emitted by the excitation light source for fingerprint detection;
  • the processing module 520 is configured to perform stitching according to multiple partial fingerprint images to obtain a target fingerprint image for fingerprint identification
  • the multiple partial fingerprint images are from different fingerprint images in the multiple fingerprint images, the areas of the multiple partial fingerprint images are at least partially non-overlapping, and the multiple partial fingerprint images correspond to different optical parameters.
  • the optical fingerprint sensor is configured to be arranged below the display screen of the electronic device to detect the fingerprint image of the human finger above the display screen, and the fingerprint detection signal is emitted by the excitation light source.
  • the optical signal is formed by reflection or scattering of the human finger above the display screen and passes through the display screen and is received by the optical fingerprint sensor.
  • the display screen is an OLED display screen
  • the fingerprint detection area of the optical fingerprint sensor is located in the display area of the OLED display screen
  • the excitation light source includes the OLED display screen. Part of the display unit of the fingerprint detection area is shown in FIG. 13.
  • the excitation light source is a built-in or external light source 540 of the device 500, for example, as shown in FIG. 14.
  • the partial fingerprint image is acquired by controlling the display unit of the OLED display screen corresponding to the partial fingerprint image to emit light and using the optical fingerprint sensor for collection, wherein
  • the exposure time period corresponds to the light-emitting time of the display unit when used as the excitation light source, or the light intensity is the light-emitting light intensity of the display unit.
  • the apparatus 500 further includes:
  • the light source driving module is used to drive the excitation light source to respectively emit the light signals of the multiple light intensities to the fingerprint detection area.
  • the light source driving module is a display driving module or a display driver for driving the display screen for screen display.
  • the device 500 may further include an optical component 530.
  • the optical component 530 may specifically include one or more optical lenses, which may The reflected light signal or fingerprint detection signal passing through the display screen 230 is converged or guided to the optical fingerprint sensor 510.
  • the optical component 530 may be the optical component 132 in FIG. 1, which will not be repeated here.
  • the processing module 520 may be specifically a microprocessor configured in the fingerprint detection apparatus 500, or may also be a terminal device applied by the fingerprint detection apparatus 10 Application processor or other processor or controller.
  • the optical fingerprint sensor 510 is specifically used for:
  • At least one second fingerprint image is collected.
  • the optical fingerprint sensor 510 is specifically used for:
  • At least one second fingerprint image is collected.
  • the processing module 520 is specifically configured to: determine the first sub-fingerprint image according to the partial fingerprint image in the first area of the at least one first fingerprint image;
  • the processing module 520 is further configured to:
  • the at least one first fingerprint image includes a first fingerprint image, determining a partial fingerprint image in the first area of the first fingerprint image as the first sub-fingerprint image;
  • the at least one first fingerprint image includes a plurality of first fingerprint images, processing partial fingerprint images in the first area of the plurality of first fingerprint images to obtain the first sub-fingerprint image.
  • the processing module 520 is specifically configured to:
  • the partial fingerprint images in the first region of the plurality of first fingerprint images are averaged, the maximum value is calculated, or the weighting process is performed according to a specific weight to obtain the first sub-fingerprint image.
  • the at least one first exposure duration is equal, or the at least one first exposure duration is not equal; or
  • the at least one second exposure duration is equal, or the at least one second exposure duration is different.
  • the multiple partial fingerprint images include a first partial fingerprint image and a second partial fingerprint image, and the area of the first partial fingerprint image is larger than the area of the second partial fingerprint image. Close to the central area of the fingerprint image, the exposure time corresponding to the first partial fingerprint image is less than the exposure time corresponding to the second partial fingerprint image, or the light intensity corresponding to the first partial fingerprint image is less than the second partial fingerprint The light intensity corresponding to the image.
  • the target fingerprint image is obtained by stitching multiple sub-fingerprint images, and in the order of the multiple sub-fingerprint images and the center of the fingerprint image, the multiple sub-fingerprint images The corresponding exposure time decreases sequentially, or the light intensity corresponding to the multiple sub-fingerprint images decreases sequentially.
  • the multiple optical parameters are at least one of pixel values, saturation, contrast, and sharpness of fingerprint images collected according to pixel points in different regions in the pixel array of the optical fingerprint sensor.
  • One definite is one of pixel values, saturation, contrast, and sharpness of fingerprint images collected according to pixel points in different regions in the pixel array of the optical fingerprint sensor.
  • the regions corresponding to the multiple partial fingerprint images are concentric circles or rectangular rings with a common center.
  • the embodiment of the present application also provides an electronic device 800.
  • the electronic device 800 may include a display screen 820 and the aforementioned fingerprint detection device 810.
  • the fingerprint detection device 810 may be the aforementioned embodiment
  • the fingerprint detection device 500 is arranged below the display screen 820.
  • the fingerprint detection device 810 may be used to execute the content in the foregoing method embodiment, and for the sake of brevity, details are not repeated here.
  • the display screen 820 has a self-luminous display unit, and the self-luminous display unit can be used as an excitation light source for the fingerprint detection device 810 for fingerprint detection.
  • the size of the sequence numbers of the above-mentioned processes does not mean the order of execution, and the execution order of the processes should be determined by their functions and internal logic, and should not be used as described in the embodiments of the present application.
  • the implementation process constitutes any limitation.
  • processor or processing module of the embodiment of the present application may be an integrated circuit chip with signal processing capability.
  • the steps of the foregoing method embodiments can be completed by hardware integrated logic circuits in the processor or instructions in the form of software.
  • the aforementioned processor may be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (ASIC), a ready-made programmable gate array (Field Programmable Gate Array, FPGA) or other Programming logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • DSP Digital Signal Processor
  • ASIC application specific integrated circuit
  • FPGA Field Programmable Gate Array
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers.
  • the storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.
  • the electronic device of the embodiment of the present application may further include a memory
  • the memory may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), and electrically available Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be a random access memory (Random Access Memory, RAM), which is used as an external cache.
  • RAM random access memory
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • DRAM synchronous dynamic random access memory
  • DDR SDRAM Double Data Rate Synchronous Dynamic Random Access Memory
  • Enhanced SDRAM, ESDRAM Enhanced Synchronous Dynamic Random Access Memory
  • Synchronous Link Dynamic Random Access Memory Synchronous Link Dynamic Random Access Memory
  • DR RAM Direct Rambus RAM
  • the embodiment of the present application also proposes a computer-readable storage medium that stores one or more programs, and the one or more programs include instructions.
  • the instructions are included in a portable electronic device that includes multiple application programs When executed, the portable electronic device can be made to execute the method of the embodiment shown in FIG. 3.
  • the embodiment of the present application also proposes a computer program, which includes instructions.
  • the computer program When the computer program is executed by a computer, the computer can execute the method of the embodiment shown in FIG. 3.
  • An embodiment of the present application also provides a chip that includes an input and output interface, at least one processor, at least one memory, and a bus.
  • the at least one memory is used to store instructions, and the at least one processor is used to call the at least one memory. To execute the method of the embodiment shown in FIG. 3.
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • each unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of the present application essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , Including several instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code .

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Abstract

L'invention concerne un procédé et un appareil de détection d'empreinte digitale, et un dispositif électronique. Le procédé comprend les étapes consistant à : acquérir respectivement une pluralité d'images d'empreinte digitale sur la base d'une pluralité de paramètres optiques, les paramètres optiques comprenant une durée d'exposition et/ou une intensité lumineuse, l'image d'empreinte digitale étant obtenue par un capteur optique d'empreinte digitale sur la base d'un signal de détection d'empreinte digitale, la durée d'exposition étant une durée du capteur optique d'empreinte digitale acquérant le signal de détection d'empreinte digitale, et l'intensité lumineuse étant une intensité d'un signal optique émis par une source de lumière d'excitation pour la détection d'empreinte digitale ; épisser une pluralité d'images d'empreinte digitale partielles pour obtenir une image d'empreinte digitale cible pour une reconnaissance d'empreinte digitale, la pluralité d'images d'empreinte digitale partielles provenant d'images d'empreinte digitale différentes dans la pluralité d'images d'empreinte digitale, et au moins une partie des régions de la pluralité d'images d'empreinte digitale partielles ne se chevauchant pas, et la pluralité d'images d'empreinte digitale partielles correspondant à différents paramètres optiques.
PCT/CN2019/085725 2019-05-06 2019-05-06 Procédé et appareil de détection d'empreinte digitale, et dispositif électronique Ceased WO2020223881A1 (fr)

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN113191327A (zh) * 2021-05-25 2021-07-30 深圳市汇顶科技股份有限公司 生物特征采集方法、芯片及计算机可读存储介质
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