WO2020223881A1 - 指纹检测的方法、装置和电子设备 - Google Patents

指纹检测的方法、装置和电子设备 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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Prior art keywords
fingerprint
fingerprint image
partial
images
image
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PCT/CN2019/085725
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English (en)
French (fr)
Inventor
谢良辉
丘芳芳
Original Assignee
深圳市汇顶科技股份有限公司
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Application filed by 深圳市汇顶科技股份有限公司 filed Critical 深圳市汇顶科技股份有限公司
Priority to CN201980000668.7A priority Critical patent/CN110268418B/zh
Priority to PCT/CN2019/085725 priority patent/WO2020223881A1/zh
Publication of WO2020223881A1 publication Critical patent/WO2020223881A1/zh

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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; CALCULATING OR 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

一种指纹检测的方法、装置和电子设备，该方法包括：基于多个光学参数分别采集多个指纹图像，其中，所述光学参数包括曝光时长和光强中的至少一个，所述指纹图像是光学指纹传感器基于指纹检测信号获得的，所述曝光时长为所述光学指纹传感器采集所述指纹检测信号的时长，所述光强为激励光源发射的用于指纹检测的光信号的强度；根据多个局部指纹图像进行拼接，得到用于指纹识别的目标指纹图像；其中，所述多个局部指纹图像来自所述多个指纹图像中的不同的指纹图像，所述多个局部指纹图像的区域至少部分不重叠，所述多个局部指纹图像对应不同的光学参数。

Description

指纹检测的方法、装置和电子设备 技术领域
本申请涉及光学指纹技术领域，并且更具体地，涉及一种指纹检测的方法、装置和电子设备。
背景技术
光学指纹装置的应用给用户带来了安全和便捷的用户体验，但是，由于光学指纹装置可以采用透镜通过小孔成像的原理实现，由于透镜的光学成像原理，导致光学指纹装置的像素阵列的中心区域进光量比边缘区域的进光量大，进而导致指纹图像的中心区域的信号量比边缘区域的信号量大，也就是说，指纹图像的中心区域清晰，边缘区域模糊，再加上手指边沿容易出现接触不好的情况，使得二者的信号量的差距更大，最终导致指纹识别率较低。
发明内容
提供了一种指纹检测的方法、装置和电子设备，能够提升指纹识别率。
第一方面，提供了一种指纹检测的方法，包括：
基于多个光学参数分别采集多个指纹图像，其中，所述光学参数包括曝光时长和光强中的至少一个，所述指纹图像是光学指纹传感器基于指纹检测信号获得的，所述曝光时长为所述光学指纹传感器采集所述指纹检测信号的时长，所述光强为激励光源发射的用于指纹检测的光信号的强度；
根据多个局部指纹图像进行拼接，得到用于指纹识别的目标指纹图像；
其中，所述多个局部指纹图像来自所述多个指纹图像中的不同的指纹图像，所述多个局部指纹图像的区域至少部分不重叠，所述多个局部指纹图像对应不同的光学参数。
在一些可能的实现方式中，所述光学指纹传感器用于设置在电子设备的显示屏下方以检测所述显示屏上方的人体手指的指纹图像，所述指纹检测信号是所述激励光源发射的光信号在所述显示屏上方的人体手指发生反射或散射而形成并且穿过所述显示屏被所述光学指纹传感器接收的光信号。
在一些可能的实现方式中，所述显示屏为OLED显示屏，所述光学指纹传感器的指纹检测区域位于所述OLED显示屏的显示区域，且所述激励光源 包括所述OLED显示屏在所述指纹检测区域的部分显示单元。
在一些可能的实现方式中，所述局部指纹图像是通过控制所述OLED显示屏与所述局部指纹图像相对应的显示单元发光并利用所述光学指纹传感器进行采集获取的；其中，所述曝光时长与所述显示单元在作为所述激励光源时的发光时间相对应，或者，所述光强为所述显示单元的发光光强。
在一些可能的实现方式中，所述基于多个光学参数分别采集多个指纹图像，包括：基于至少一个第一曝光时长，采集至少一个第一指纹图像；以及
基于至少一个第二曝光时长，采集至少一个第二指纹图像。
在一些可能的实现方式中，所述基于多个光学参数分别采集多个指纹图像，包括：
基于至少一个第一光强，采集至少一个第一指纹图像；以及
基于至少一个第二光强，采集至少一个第二指纹图像。
在一些可能的实现方式中，所述根据多个局部指纹图像进行拼接，得到用于指纹识别的目标指纹图像，包括：根据所述至少一个第一指纹图像的第一区域中的局部指纹图像，确定第一子指纹图像；根据所述至少一个第二指纹图像的第二区域中的局部指纹图像，确定第二子指纹图像；根据所述第一子指纹图像和所述第二子指纹图像进行拼接，得到所述目标指纹图像。
在一些可能的实现方式中，所述根据所述至少一个第一指纹图像的第一区域中的局部指纹图像，确定第一子指纹图像，包括：
若所述至少一个第一指纹图像包括一个第一指纹图像，将所述第一指纹图像的第一区域中的局部指纹图像确定为所述第一子指纹图像；或者
若所述至少一个第一指纹图像包括多个第一指纹图像，对所述多个第一指纹图像的第一区域中的局部指纹图像进行处理，得到所述第一子指纹图像。
在一些可能的实现方式中，所述对所述多个第一指纹图像的第一区域中的局部指纹图像进行处理，得到所述第一子指纹图像，包括：
对所述多个第一指纹图像的第一区域中的局部指纹图像进行求平均值，求最大值，或按照特定的权重进行加权处理，得到所述第一子指纹图像。
在一些可能的实现方式中，所述至少一个第一曝光时长相等，或所述至少一个第一曝光时长不等；或者
所述至少一个第二曝光时长相等，或所述至少一个第二曝光时长不等。
在一些可能的实现方式中，所述多个局部指纹图像包括第一局部指纹图 像和第二局部指纹图像，所述第一局部指纹图像的区域比所述第二局部指纹图像的区域更靠近指纹图像的中心区域，所述第一局部指纹图像对应的曝光时长小于所述第二局部指纹图像对应的曝光时长，或所述第一局部指纹图像对应的光强小于所述第二局部指纹图像对应的光强。
在一些可能的实现方式中，所述目标指纹图像是由多个子指纹图像拼接得到的，按照所述多个子指纹图像与指纹图像的中心由远到近的顺序，所述多个子指纹图像对应的曝光时长依次递减，或所述多个子指纹图像对应的光强依次递减。
在一些可能的实现方式中，所述多个光学参数是根据所述光学指纹传感器的像素阵列中不同区域的像素点采集的指纹图像的像素值、饱和度、对比度和锐度中的至少一项确定的。
在一些可能的实现方式中，所述多个局部指纹图像对应的区域为同心圆或共中心的矩形环。
第二方面，提供了一种指纹检测的装置，包括：
光学指纹传感器，用于基于多个光学参数分别采集多个指纹图像，其中所述光学参数包括曝光时长和光强中的至少一个，所述指纹图像是所述光学指纹传感器基于指纹检测信号获得的，所述曝光时长为所述光学指纹传感器采集所述指纹检测信号的时长，所述光强为激励光源发射的用于指纹检测的光信号的强度；
处理模块，用于根据多个局部指纹图像进行拼接，得到用于指纹识别的目标指纹图像；
其中，所述多个局部指纹图像来自所述多个指纹图像中的不同的指纹图像，所述多个局部指纹图像的区域至少部分不重叠，所述多个局部指纹图像对应不同的光学参数。
在一些可能的实现方式中，所述光学指纹传感器用于设置在电子设备的显示屏下方以检测所述显示屏上方的人体手指的指纹图像，所述指纹检测信号是所述激励光源发射的光信号在所述显示屏上方的人体手指发生反射或散射而形成并且穿过所述显示屏被所述光学指纹传感器接收的光信号。
在一些可能的实现方式中，所述显示屏为OLED显示屏，所述光学指纹传感器的指纹检测区域位于所述OLED显示屏的显示区域，且所述激励光源包括所述OLED显示屏在所述指纹检测区域的部分显示单元。
在一些可能的实现方式中，所述局部指纹图像是通过控制所述OLED显示屏与所述局部指纹图像相对应的显示单元发光并利用所述光学指纹传感器进行采集获取的，其中，所述曝光时长与所述显示单元在作为所述激励光源时的发光时间相对应，或者，所述光强为所述显示单元的发光光强。
在一些可能的实现方式中，所述光学指纹传感器具体用于：
基于至少一个第一曝光时长，采集至少一个第一指纹图像；以及
基于至少一个第二曝光时长，采集至少一个第二指纹图像。
在一些可能的实现方式中，所述光学指纹传感器具体用于：
基于至少一个第一光强，采集至少一个第一指纹图像；以及
基于至少一个第二光强，采集至少一个第二指纹图像。
在一些可能的实现方式中，所述处理模块具体用于：根据所述至少一个第一指纹图像的第一区域中的局部指纹图像，确定第一子指纹图像；
根据所述至少一个第二指纹图像的第二区域中的局部指纹图像，确定第二子指纹图像；
根据所述第一子指纹图像和所述第二子指纹图像进行拼接，得到所述目标指纹图像。
在一些可能的实现方式中，所述处理模块还用于：
若所述至少一个第一指纹图像包括一个第一指纹图像，将所述第一指纹图像的第一区域中的局部指纹图像确定为所述第一子指纹图像；或者
若所述至少一个第一指纹图像包括多个第一指纹图像，对所述多个第一指纹图像的第一区域中的局部指纹图像进行处理，得到所述第一子指纹图像。
在一些可能的实现方式中，所述处理模块具体用于：
对所述多个第一指纹图像的第一区域中的局部指纹图像进行求平均值，求最大值，或按照特定的权重进行加权处理，得到所述第一子指纹图像。
在一些可能的实现方式中，所述至少一个第一曝光时长相等，或所述至少一个第一曝光时长不等；或者
所述至少一个第二曝光时长相等，或所述至少一个第二曝光时长不等。
在一些可能的实现方式中，所述多个局部指纹图像包括第一局部指纹图像和第二局部指纹图像，所述第一局部指纹图像的区域比所述第二局部指纹图像的区域更靠近指纹图像的中心区域，所述第一局部指纹图像对应的曝光时长小于所述第二局部指纹图像对应的曝光时长，或所述第一局部指纹图像 对应的光强小于所述第二局部指纹图像对应的光强。
在一些可能的实现方式中，所述目标指纹图像是由多个子指纹图像拼接得到的，按照所述多个子指纹图像与指纹图像的中心由远到近的顺序，所述多个子指纹图像对应的曝光时长依次递减，或所述多个子指纹图像对应的光强依次递减。
在一些可能的实现方式中，所述多个光学参数是根据所述光学指纹传感器的像素阵列中不同区域的像素点采集的指纹图像的像素值、饱和度、对比度和锐度中的至少一项确定的。
在一些可能的实现方式中，所述多个局部指纹图像对应的区域为同心圆或共中心的矩形环。
在一些可能的实现方式中，所述装置还包括：
光源驱动模块，用于驱动所述激励光源向所述指纹检测区域分别发射所述多个光强的光信号。
在一些可能的实现方式中，所述光源驱动模块为用于驱动所述显示屏进行画面显示的显示驱动模块或者显示驱动器。
第三方面，提供了一种芯片，该芯片包括输入输出接口、至少一个处理器、至少一个存储器和总线，该至少一个存储器用于存储指令，该至少一个处理器用于调用该至少一个存储器中的指令，以执行第一方面或第一方面的任一可能的实现方式中的方法。
第四方面，提供了一种电子设备，包括显示屏和设置在所述显示屏下方的指纹检测的装置，其中所述指纹检测的装置为如第二方面或第二方面的任一可能的实现方式中的指纹检测的装置。
第五方面，提供了一种电子设备，包括如第三方面中的芯片。
第六方面，提供了一种计算机可读介质，用于存储计算机程序，所述计算机程序包括用于执行上述第一方面或第一方面的任一可能的实现方式中的指令。
第七方面，提供了一种包括指令的计算机程序产品，当计算机运行所述计算机程序产品的所述指时，所述计算机执行上述第一方面或第一方面的任一可能的实现方式中的指纹检测的方法。
具体地，该计算机程序产品可以运行于上述第四方面至第五方面中的电子设备上。
附图说明
图1A是根据本申请一实施例的电子设备的定向视图。
图1B是图1A所示的电子设备沿A-A’的部分剖面结构示意图。
图2是指纹图像的曝光时长和像素值的变化曲线。
图3是根据本申请实施例的指纹检测的方法的示意性流程图。
图4至图11是通过不同的曝光时长采集指纹图像，进而进行拼接得到目标指纹图像的示例图。
图12是基于单一曝光时长和基于多个曝光时长采集的指纹图像的信号量分布图。
图13是根据本申请实施例的指纹检测的装置的示意性框图。
图14是根据本申请一种实施例的指纹检测装置的***结构示意图。
图15是根据本申请另一种实施例的指纹检测装置的***结构示意图。
图16是根据本申请实施例的电子设备的示意性框图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
作为一种常见的应用场景，本申请实施例提供的光学指纹***可以应用在智能手机、平板电脑以及其他具有显示屏的移动终端或者其他终端设备；更具体地，在上述终端设备中，指纹识别装置可以具体为光学指纹装置，其可以设置在显示屏下方的局部区域或者全部区域，从而形成屏下(Under-display)光学指纹***。或者，所述指纹识别装置也可以部分或者全部集成至所述终端设备的显示屏内部，从而形成屏内(In-display)光学指纹***。
图1A和图1B示出了本申请实施例可以适用的电子设备的示意图，其中，图1为电子设备10的正面示意图，图1B为图1A所示的电子设备10沿A-A’的部分剖面结构示意图。
如图1A和图1B所示，所述电子设备10包括显示屏120和光学指纹装置130，其中，所述光学指纹装置130设置在所述显示屏120下方的局部区域。所述光学指纹装置130包括光学指纹传感器，所述光学指纹传感器包括具有多个光学感应单元的感应阵列，所述感应阵列所在区域或者其感应区域 为所述光学指纹装置130的指纹检测区域103。如图1A所示，所述指纹检测区域103位于所述显示屏120的显示区域之中。在一种替代实施例中，所述光学指纹装置130还可以设置在其他位置，比如所述显示屏120的侧面或者所述电子设备10的边缘非透光区域，并通过光路设计来将所述显示屏120的至少部分显示区域的光信号导引到所述光学指纹装置130，从而使得所述指纹检测区域103实际上位于所述显示屏120的显示区域。
应当理解，所述指纹检测区域103的面积可以与所述光学指纹装置130的感应阵列的面积不同，例如通过例如透镜成像的光路设计、反射式折叠光路设计或者其他光线汇聚或者反射等光路设计，可以使得所述光学指纹装置130的指纹检测区域103的面积大于所述光学指纹装置130感应阵列的面积。在其他替代实现方式中，如果采用例如光线准直方式进行光路引导，所述光学指纹装置130的指纹检测区域103也可以设计成与所述光学指纹装置130的感应阵列的面积基本一致。
因此，使用者在需要对所述电子设备进行解锁或者其他指纹验证的时候，只需要将手指按压在位于所述显示屏120的指纹检测区域103，便可以实现指纹输入。由于指纹检测可以在屏内实现，因此采用上述结构的电子设备10无需其正面专门预留空间来设置指纹按键(比如Home键)，从而可以采用全面屏方案，即所述显示屏120的显示区域可以基本扩展到整个电子设备10的正面。
作为一种可选的实现方式，如图1B所示，所述光学指纹装置130包括光检测部分134和光学组件132，所述光检测部分134包括所述感应阵列以及与所述感应阵列电性连接的读取电路及其他辅助电路，其可以在通过半导体工艺制作在一个芯片(Die)，比如光学成像芯片或者光学指纹传感器，所述感应阵列具体为光探测器(Photo detector)阵列，其包括多个呈阵列式分布的光探测器，所述光探测器可以作为如上所述的光学感应单元；所述光学组件132可以设置在所述光检测部分134的感应阵列的上方，其可以具体包括滤光层(Filter)、导光层或光路引导结构以及其他光学元件，所述滤光层可以用于滤除穿透手指的环境光，而所述导光层或光路引导结构主要用于从手指表面反射回来的反射光导引至所述感应阵列进行光学检测。
在具体实现上，所述光学组件132可以与所述光检测部分134封装在同一个光学指纹部件。比如，所述光学组件132可以与所述光学检测部分134 封装在同一个光学指纹芯片，也可以将所述光学组件132设置在所述光检测部分134所在的芯片外部，比如将所述光学组件132贴合在所述芯片上方，或者将所述光学组件132的部分元件集成在上述芯片之中。
其中，所述光学组件132的导光层或者光路引导结构有多种实现方案，比如，所述导光层可以具体为在半导体硅片制作而成的准直器(Collimator)层，其具有多个准直单元或者微孔阵列，所述准直单元可以具体为小孔，从手指反射回来的反射光中，垂直入射到所述准直单元的光线可以穿过并被其下方的光学感应单元接收，而入射角度过大的光线在所述准直单元内部经过多次反射被衰减掉，因此每一个光学感应单元基本只能接收到其正上方的指纹纹路反射回来的反射光，从而所述感应阵列便可以检测出手指的指纹图像。
在另一种实施例中，所述导光层或者光路引导结构也可以为光学透镜(Lens)层，其具有一个或多个透镜单元，比如一个或多个非球面透镜组成的透镜组，其用于将从手指反射回来的反射光汇聚到其下方的光检测部分134的感应阵列，以使得所述感应阵列可以基于所述反射光进行成像，从而得到所述手指的指纹图像。可选地，所述光学透镜层在所述透镜单元的光路中还可以形成有针孔，所述针孔可以配合所述光学透镜层扩大所述光学指纹装置的视场，以提高所述光学指纹装置130的指纹成像效果。
在其他实施例中，所述导光层或者光路引导结构也可以具体采用微透镜(Micro-Lens)层，所述微透镜层具有由多个微透镜形成的微透镜阵列，其可以通过半导体生长工艺或者其他工艺形成在所述光检测部分134的感应阵列上方，并且每一个微透镜可以分别对应于所述感应阵列的其中一个感应单元。并且，所述微透镜层和所述感应单元之间还可以形成其他光学膜层，比如介质层或者钝化层，更具体地，所述微透镜层和所述感应单元之间还可以包括具有微孔的挡光层，其中所述微孔形成在其对应的微透镜和感应单元之间，所述挡光层可以阻挡相邻微透镜和感应单元之间的光学干扰，并使得所述感应单元所对应的光线通过所述微透镜汇聚到所述微孔内部并经由所述微孔传输到所述感应单元以进行光学指纹成像。
应当理解，上述光路引导结构的几种实现方案可以单独使用也可以结合使用，比如，可以在所述准直器层或者所述光学透镜层下方进一步设置微透镜层。当然，在所述准直器层或者所述光学透镜层与所述微透镜层结合使用时，其具体叠层结构或者光路可能需要按照实际需要进行调整。
作为一种可选的实施例，所述显示屏120可以采用具有自发光显示单元的显示屏，比如有机发光二极管(Organic Light-Emitting Diode，OLED)显示屏或者微型发光二极管(Micro-LED)显示屏。以采用OLED显示屏为例，所述光学指纹装置130可以利用所述OLED显示屏120位于所述指纹检测区域103的显示单元(即OLED光源)来作为光学指纹检测的激励光源。当手指按压在所述指纹检测区域103时，显示屏120可以在所述指纹检测区域显示一个特定光斑，以向所述指纹检测区域103上方的目标手指发出指纹激励光，该指纹激励光可以在手指的表面发生反射形成反射光或者经过所述手指内部散射而形成散射光，在相关专利申请中，为便于描述，上述反射光和散射光统称为反射光。由于指纹的嵴(ridge)与峪(valley)对于光的反射能力不同，因此，来自指纹嵴的反射光和来自指纹峪的发射光具有不同的光强，反射光经过光学组件后，被光学指纹装置130中的感应阵列所接收并转换为相应的电信号，即指纹检测信号；基于所述指纹检测信号便可以获得指纹图像数据，并且可以进一步进行指纹匹配验证，从而在所述电子设备10实现光学指纹识别功能。
在其他实施例中，所述光学指纹装置130也可以采用内置光源或者外置光源来提供用于进行指纹检测的光信号。在这种情况下，所述光学指纹装置130可以适用于非自发光显示屏，比如液晶显示屏或者其他的被动发光显示屏。以应用在具有背光模组和液晶面板的液晶显示屏为例，为支持液晶显示屏的屏下指纹检测，所述电子设备10的光学指纹***还可以包括用于光学指纹检测的激励光源，所述激励光源可以具体为红外光源或者特定波长非可见光的光源，其可以设置在所述液晶显示屏的背光模组下方或者设置在所述电子设备10的保护盖板下方的边缘区域，而所述光学指纹装置130可以设置液晶面板或者保护盖板的边缘区域下方并通过光路引导以使得指纹检测光可以到达所述光学指纹装置130；或者，所述光学指纹装置130也可以设置在所述背光模组下方，且所述背光模组通过对扩散片、增亮片、反射片等膜层进行开孔或者其他光学设计以允许指纹检测光穿过液晶面板和背光模组并到达所述光学指纹装置130。当采用所述光学指纹装置130采用内置光源或者外置光源来提供用于进行指纹检测的光信号时，其检测原理与上面描述内容是一致的。
应当理解的是，在具体实现上，所述电子设备10还包括透明保护盖板， 所述盖板可以为玻璃盖板或者蓝宝石盖板，其位于所述显示屏120的上方并覆盖所述电子设备10的正面。因为，本申请实施例中，所谓的手指按压在所述显示屏120实际上是指按压在所述显示屏120上方的盖板或者覆盖所述盖板的保护层表面。
另一方面，在某些实施例中，所述光学指纹装置130可以仅包括一个光学指纹传感器，此时光学指纹装置130的指纹检测区域103的面积较小且位置固定，因此用户在进行指纹输入时需要将手指按压到所述指纹检测区域103的特定位置，否则光学指纹装置130可能无法采集到指纹图像而造成用户体验不佳。在其他替代实施例中，所述光学指纹装置130可以具体包括多个光学指纹传感器；所述多个光学指纹传感器可以通过拼接方式并排设置在所述显示屏120的下方，且所述多个光学指纹传感器的感应区域共同构成所述光学指纹装置130的指纹检测区域103。也即是说，所述光学指纹装置130的指纹检测区域103可以包括多个子区域，每个子区域分别对应于其中一个光学指纹传感器的感应区域，从而将所述光学指纹装置130的指纹采集区域103可以扩展到所述显示屏的下半部分的主要区域，即扩展到手指惯常按压区域，从而实现盲按式指纹输入操作。可替代地，当所述光学指纹传感器数量足够时，所述指纹检测区域130还可以扩展到半个显示区域甚至整个显示区域，从而实现半屏或者全屏指纹检测。
应理解，本申请实施例中的光学指纹装置也可以称为光学指纹识别模组、指纹装置、指纹识别装置、指纹识别模组、指纹模组、指纹采集装置等。
由于光学指纹装置的光学组件(例如，透镜)的光学成像原理，导致该光学指纹装置的像素阵列(对应于前文所述的感应阵列)的中心区域进光量比边缘区域的进光量大，进而导致指纹图像的中心区域的信号量比边缘区域的信号量大，也就是说，指纹图像的中心区域清晰，边缘区域模糊，再加上手指边沿容易出现接触不好的情况，使得二者的信号量的差距更大，最终导致指纹识别率较低。
具体来说，这是由于像素阵列的中心区域和边缘区域进行指纹采集对应的线性范围不同造成的，如图2所示为采集指纹图像所使用的曝光时长和采集的指纹图像的像素值的关系曲线，可见在一定的曝光时长范围内，曝光时长和像素值呈线性关系，超过这个线性范围，指纹图像的像素值进入饱和区，在线性范围中的指纹图像是有效的。
由于光学组件的影响，中心区域的进光量通常比边缘区域的进光量大，这就导致指纹采集时，中心区域的信号量比边缘区域的信号量的提升速度更快，若采用较小的曝光时长进行指纹采集，能够保证中心区域的像素值在线性范围内，但是边缘区域的信号量更小，若采用较大的曝光时长进行指纹采集，边缘区域的信号量能够得到提升，但是中心区域的信号会提前进入饱和区，进而导致采集的中心区域的指纹图像失效。
有鉴于此，本申请实施例提供了一种指纹检测方案，通过不同的曝光时间进行指纹图像的采集，进一步将采集的指纹图像中有效的局部指纹图像进行拼接，得到目标指纹图像，然后采用该目标指纹图像进行指纹识别，从而提升指纹识别率。
图3是本申请实施例提供的一种指纹检测的方法的示意性流程图，应理解，该指纹检测的方法300可以应用于指纹检测的装置或电子设备中。如图3所示，该指纹检测的方法300可以包括如下内容：
S310，基于多个光学参数分别采集多个指纹图像，其中，所述光学参数包括曝光时长和光强中的至少一个；
S320，根据多个局部指纹图像进行拼接，得到用于指纹识别的目标指纹图像，其中，所述多个局部指纹图像来自所述多个指纹图像中的不同的指纹图像，所述多个局部指纹图像的区域至少部分不重叠，所述多个局部指纹图像对应不同的曝光时长。
其中，所述曝光时长可以对应于光学指纹传感器的光学参数，该光强可以对应于用于指纹检测的激励光源的光学参数，本申请实施例也可以基于其他光学指纹传感器和激励光源的其他光学参数采集多个指纹图像。
首先结合图13和图14，对本申请实施例的指纹检测的装置500的工作原理进行简单说明。
在本申请实施例中，该指纹检测的装置500可以设置于电子设备的显示屏200的下方，该显示屏200可以对应于图1所示的显示屏120，该显示屏200的指纹检测区域230可以为图1所示的指纹检测区域103。
在图13所示的实施例中，所述显示屏200可以具体为自发光显示屏(比如OLED显示屏)，且其包括多个自发光显示单元201(比如OLED像素或者OLED光源)，所述自发光显示单元201用于在显示驱动模块的驱动下进行发光以使得所述显示屏200显示对应的画面。
可选地，在一些实施例中，所述显示屏200中位于所述指纹检测区域230的部分自发光显示单元201可以作为所述指纹检测的装置20进行指纹检测的激励光源，用于向所述指纹检测区域230发射光信号以在所述指纹检测区域230形成预定图案的光斑。本申请实施中的所述局部指纹图像可以是通过控制所述OLED显示屏与所述局部指纹图像相对应的显示单元发光并利用所述光学指纹传感器进行采集获取的，其中，所述曝光时长与所述显示单元在作为所述激励光源时的发光时间相对应，或者，所述光强为所述显示单元的发光光强。
可选地，在另一些实施例中，也可以为在该指纹检测的装置额外设置的外置光源，如图14所示，比如红外光源，作为检测的激励光源，所述外置光源540同样可以设置在所述显示屏200的下方，用于向所述显示屏200的指纹检测区域230发射光信号以在所述指纹检测区域230形成预设图案的光斑。
可选地，在本申请实施例中，可以通过光源驱动模块来驱动所述激励光源发射的光信号的强度，以在所述指纹检测区域230显示所述预定图案的光斑。
以所述显示屏200的自发光显示单元作为所述指纹检测装置20的激励光源为例，该激励光源可以包括红光光源、绿光光源和蓝光光源，例如，所述显示屏200的红色显示单元、绿色显示单元和蓝色显示单元，通过所述显示屏的显示驱动模块控制这三种光源发射的光信号的比例和/或灰度值等光学参数，可以控制向所述指纹检测区域230发射的光信号的强度。
本申请实施例中的用于指纹采集的光强可以为激励光源发射的光信号的光强，该光强可以通过控制激励光源中的红光光源、绿光光源和蓝光光源发射的光信号的比例和/或灰度值等光学参数进行控制。通常来说，光强越大，采集的指纹图像中的像素值越大，反之，光强越小，采集的指纹图像中的像素值越小。因此，通过不同的光强采集多个指纹图像，进一步可以将该多个指纹图像中像素值处于同一水平的局部指纹图像进行拼接，得到完整的目标指纹图像。
应理解，在本申请实施例中的曝光时长是指为了将指纹检测信号入射到指纹传感器的感应阵列上，快门所要打开的时间，其中，所述指纹检测信号为在显示屏的指纹检测区域形成的预定图案所对应的光信号在用户手指反 射或散射而形成的光信号。通常来说，曝光时长越长，进入到感应阵列的光信号的量就大，相应地，指纹传感器采集的指纹图像的像素值越大。具体而言，像素阵列中的不同区域(例如，边缘区域和中心区域)对应的线性范围不同，则基于一个曝光时长采集的指纹图像中，只有特定区域中的指纹图像才是有效的，即，该特定区域中的指纹图像的像素值是处于线性范围内的，将该特定区域记为有效数据区或有效图像区域。这样，一个曝光时长可以对应一个有效图像区域，基于该曝光时长采集指纹图像，进一步可以根据该指纹图像的有效图像区域中的局部指纹图像拼接目标指纹图像。
例如，可以通过第一光强采集第一指纹图像，以及通过第二光强采集第二指纹图像，其中，第一光强大于第二光强，由于对于同一光强采集的指纹图像而言，边缘区域的指纹图像的信号量相对于中心区域的信号量较小，因此，在一种实现方式中，在进行目标指纹图像拼接时，可以将第一指纹图像中的边缘区域的局部指纹图像和第二指纹图像的中心区域的局部指纹图像进行拼接得到所述目标指纹图像。
基于此，与曝光时长和像素值的关系类似，基于特定光强采集的指纹图像中，也可以认为只有特定区域的指纹图像是有效的，例如，光强较小的指纹图像的中心区域可以认为是有效的，光强较大的指纹图像的边缘区域可以认为是有效的。即，也可以认为一个光强可以对应一个有效图像区域，基于该光强采集指纹图像，进一步可以根据该指纹图像的有效图像区域中的局部指纹图像拼接目标指纹图像。
在本申请实施例中，所述指纹检测的装置可以基于多个曝光时长或多个光强采集多个指纹图像，不同的曝光时长或光强可以认为对应不同的有效图像区域，进一步可以根据该多个指纹图像的有效图像区域中的局部指纹图像进行拼接，得到完整的目标指纹图像，由于该目标指纹图像是由有效图像区域中的局部指纹图像拼接得到的，能够提升整帧指纹图像的信号量，从而提升指纹识别率。
因此，本申请实施例中，可以采用不同的曝光时长或光强进行指纹图像的采集，进一步可以根据指纹图像的局部区域中的局部指纹图像进行拼接，得到用于指纹识别的目标指纹图像，也就是说，该目标指纹图像可以来自采用不同的曝光时长或光强采集的指纹图像，有利于解决像素阵列的不同区域对应的线性范围不同导致的指纹识别率低的问题。
需要说明的是，本申请实施例也可以根据多个其他参数进行指纹图像，该参数可以影响采集的指纹图像的像素值，例如，用于指纹采集的光信号的灰度，颜色，色散程度等，本申请实施例对此不作限定。
以下，以基于多个曝光时长进行指纹采集，并进一步根据采集的多个指纹图像进行拼接得到目标指纹图像为例进行说明，基于多个光强进行指纹采集，并根据采集的多个指纹图像进行拼接得到目标指纹图像的具体实现类似，这里不再赘述。
可选地，在一些实施例中，可以直接将所述多个局部指纹图像进行拼接得到所述目标指纹图像。
例如，所述多个指纹图像包括第一指纹图像和第二指纹图像，所述多个局部指纹图像可以包括来自第一指纹图像的第一局部指纹图像，以及来自第二指纹图像的第二局部指纹图像，其中，所述第一局部指纹图像和所述第二局部指纹图像可以对应指纹图像中的不同区域，可以直接拼接所述第一局部指纹图像和所述第二局部指纹图像得到所述目标指纹图像。
可选地，在另一些实施例中，也可以将所述多个局部指纹图像进行处理，得到多个子指纹图像，进一步将该多个子指纹图像进行拼接得到该目标指纹图像。
为便于区分和说明，将目标指纹图像中的局部指纹图像称为子指纹图像，该子指纹图像可以来自采集的指纹图像中的局部指纹图像，或者也可以为采集的指纹图像中的局部指纹图像经过处理得到的。也就是说，该子指纹图像可以为局部指纹图像，或者也可以为多个局部指纹图像处理得到的其他指纹图像。
例如，所述多个指纹图像包括第一指纹图像，第二指纹图像和第三指纹图像，所述多个局部指纹图像包括来自第一指纹图像的第一局部指纹图像，来自第二指纹图像的第二局部指纹图像和来自第三指纹图像的第三局部指纹图像，其中，该第一局部指纹图像对应指纹图像中的第一区域，该第二局部指纹图像和第三局部指纹图像都可以对应指纹图像中的第二区域，例如，该第二指纹图像和第三指纹图像可以是基于同一曝光时长采集的。
作为一种可选的实现方式，在采用OLED显示屏的显示单元作为指纹检测的激励光源时，为获取该第一指纹图像的第一局部指纹图像，可以控制在与所述第一局部指纹图像相对应的OLED显示单元发光，而其他区域的 OLED显示单元不发光，并利用所述光学指纹传感器进行指纹图像采集，从而获取到所述第一指纹图像的第一局部指纹图像；相类似地，在获取该第二指纹图像的第二局部指纹图像和该第三指纹图像的第三局部指纹图像时，也可以分别控制与所述第二局部指纹图像和所述第三局部指纹图像的OLED显示单元分别发光并利用所述光学指纹传感器进行指纹图像采集。其中，在获取上述局部指纹图像的曝光时长可以与所述OLED显示单元在作为所述激励光源时的发光时间相对应。
作为另一可选的实现方式，所述光学指纹传感器在采集所述第一局部指纹图像、所述第二局部指纹图像和所述第三局部指纹图像时，可以仅仅分别启用与上述局部指纹图像相应的感应单元进行光学信号检测及采集，在这种情况下，作为指纹检测激励光源的所述OLED显示屏的显示单元的发光可以采用普通的控制方式，而无需进行特殊的发光控制。例如，为获取该第一指纹图像的第一局部指纹图像，可以控制用于指纹检测的OLED显示单元全部发光，并启用所述光学指纹传感器的第一区域中的感应单元进行指纹图像采集，从而获取到所述第一局部指纹图像，对于第二局部指纹图像，第三局部指纹图像的获取方式类似。
或者，在其他替代实施例中，为获取该第一指纹图像的第一局部指纹图像，可以控制用于指纹检测的OLED显示单元全部发光，并启用所述光学指纹传感器进行指纹图像采集，从而获取到所述第一指纹图像，进一步地，将所述第一指纹图像的所述第一区域中的局部指纹图像提取出来得到所述第一局部指纹图像，对于第二局部指纹图像，第三局部指纹图像的获取方式类似。
可选地，在本申请实施例中，局部指纹图像的曝光时长与所述激励光源时的发光时间相对应可以为在采集所述局部指纹图像时，所述局部指纹图像的曝光时长在所述激励光源的发光时长的范围内，例如，所述曝光时长等于所述发光时长，或者所述曝光时长小于所述发光时长。
在本申请实施例中，该目标指纹图像是由第一子指纹图像和第二子指纹图像拼接得到的，其中，该第一子指纹图像对应第一区域，该第二子指纹图像对应第二区域。在一种实现方式中，该第一子指纹图像可以为该第一局部指纹图像，所述第二子指纹图像可以根据该第二局部指纹图像和第三局部指纹图像确定，例如，可以将该第二局部指纹图像和第三局部指纹图像中对应 像素点的像素值取平均值，或按照特定的权重加权处理，得到所述第二子指纹图像。
可选地，在本申请实施例中，所述多个曝光时长可以完全不同，或者所述多个曝光时长也可以部分相同，本申请实施例对此不作限定。
例如，可以基于不同的曝光时长采集多个指纹图像，然后将该多个指纹图像的有效图像区域中的局部指纹图像进行拼接，得到所述目标指纹图像。
又例如，也可以基于至少两个相同的曝光时长采集至少两个指纹图像，基于该至少两个指纹图像的有效图像区域中的局部指纹图像确定该有效图像区域对应的子指纹图像，进一步将该子指纹图像拼接到目标指纹图像的对应区域中，也就是说，可以基于相同的曝光时长确定局部区域中的子指纹图像。
以下，结合图4至图11，说明根据本申请实施例的指纹图像的采集和拼接方式。
可选地，作为一个实施例，所述S310可以包括：
基于第一曝光时长采集第一指纹图像；以及
基于第二曝光时长采集第二指纹图像；
其中，第一曝光时长和所述第二曝光时长不同。
可选地，作为另一个实施例，所述S310可以包括：
基于至少一个第一光强，采集至少一个第一指纹图像；以及
基于至少一个第二光强，采集至少一个第二指纹图像。
进一步地，所述根据多个局部指纹图像进行拼接，得到用于指纹识别的目标指纹图像，包括：
根据所述第一指纹图像中的第一局部指纹图像和所述第二指纹图像中的第二局部指纹图像进行拼接，得到所述目标指纹图像。
可选地，在一些实施例中，若所述第一局部指纹图像所在的区域比所述第二局部指纹图像所在的区域更靠近指纹图像的中心区域，则该第一局部指纹图像对应的曝光时长小于所述第二局部指纹图像对应的曝光时长，即所述第一曝光时长小于所述第二曝光时长，也就是说，较小的曝光时长对应的有效图像区域更靠近中心区域，较大的曝光时长对应的有效曝光区域更靠近边缘区域。
可选地，在另一些实施例中，若所述第一局部指纹图像所在的区域比所 述第二局部指纹图像所在的区域更靠近指纹图像的中心区域，则该第一局部指纹图像对应的光强小于所述第二局部指纹图像对应的光强，也就是说，较小的光强对应的有效图像区域更靠近中心区域，较大的光强对应的有效曝光区域更靠近边缘区域。
因此，在本申请实施例中，可以采用较小的曝光时长或光强采集有效图像区域为中心区域的指纹图像，这样，能够使得进光量较大的中心区域的指纹图像处于线性区，可以采用较大的曝光时长或光强采集有效图像区域为边缘区域的指纹图像，这样，能够提升边缘区域的信号量，进而使得中心区域和边缘区域的信号量达到相当的水平，相对于提升了整帧指纹图像的清晰度，从而能够提升指纹识别率。
可选地，在一些具体实施例中，若所述目标指纹图像是由多个子指纹图像拼接得到的，则按照所述多个子指纹图像与指纹图像的中心由远到近的顺序，所述多个子指纹图像对应的曝光时长依次递减，或所述多个子指纹图像对应的光强依次递减。
也就是说，在所述目标指纹图像的子指纹图像中，越靠近中心区域的子指纹图像对应的曝光时长越小，例如，如图5所示，三个子指纹图像按照从边缘到中心的顺序，对应的曝光时长或光强依次降低，这样，曝光时长或光强能够与对应区域的进光量配合，使得整个区域的信号量处于相当的水平，从而能够保证整帧指纹图像的清晰度，进而提升指纹识别率。
如图4所示，可以基于曝光时长1采集指纹图像1，该曝光时长1对应的有效图像区域为局部指纹图像1所在的区域，这时只需保证局部指纹图像1中的像素值处于线性范围即可，不需考虑其他区域中的指纹图像是否处于线性范围。基于曝光时长2采集指纹图像2，该曝光时长2对应的有效图像区域为局部指纹图像2所在的区域，这时只需保证局部指纹图像2中的像素值处于线性范围即可，不需考虑其他区域中的指纹图像是否处于线性范围。然后将局部指纹图像1和局部指纹图像2进行拼接，得到目标指纹图像。
在一个具体实施例中，所述曝光时长1可以小于曝光时长2，此情况下，该局部指纹图像1可以为该指纹图像1的中心区域的局部指纹图像，该局部指纹图像2可以为该指纹图像2的边缘区域的局部指纹图像。
需要说明的是，在图9所示的示例中，目标指纹图像可以来自四个指纹图像的四个局部区域，采集该四个指纹图像所采用的曝光时长可以是根据该 四个局部区域中的像素点的线性范围确定的，此实施例虽然没有区分中心区域和边缘区域，但是，相对于兼顾整个像素阵列中的每个像素点的线性范围而言，兼顾局部区域中的每个像素点的线性范围更容易实现，在一定程度上可以提高每个局部区域中的指纹图像的质量，进而提升整帧指纹图像的质量。
可选地，作为另一实施例，所述S310包括：
基于至少两个第一曝光时长，采集至少两个第一指纹图像；以及
基于至少两个第二曝光时长，采集至少两个第二指纹图像。
进一步地，所述根据多个局部指纹图像进行拼接，得到用于指纹识别的目标指纹图像，包括：
根据所述至少两个第一指纹图像的第一区域中的局部指纹图像，确定第一子指纹图像；
根据所述至少两个第二指纹图像的第二区域中的局部指纹图像，确定第二子指纹图像；
根据所述第一子指纹图像和所述第二子指纹图像进行拼接，得到所述目标指纹图像。
可选地，所述至少两个第一曝光时长相等，或所述至少两个第一曝光时长也可以不等。
可选地，所述至少两个第二曝光时长相等，或所述至少两个第二曝光时长也可以不等。
应理解，该第一区域为该第一曝光时长对应的有效图像区域，该第二区域为该第二曝光时长对应的有效图像区域。
因此，在本申请实施例中，用于拼接目标指纹图像的子指纹图像可以是来自指纹图像中的局部指纹图像，也可以是由多个局部指纹图像处理得到的。
可选地，在一些实施例中，所述根据所述至少两个第一指纹图像的第一区域中的局部指纹图像，确定第一子指纹图像，包括：
对所述至少两个第一指纹图像的第一区域中的局部指纹图像进行处理，得到所述第一子指纹图像。
例如，对所述至少两个第一指纹图像的第一区域中的局部指纹图像进行求平均值，求最大值，或按照特定的权重进行加权等方式进行处理，得到所述第一子指纹图像。
类似地，也可以对所述至少两个第二指纹图像的第二区域中的局部指纹 图像进行求平均值，求最大值，或按照特定的权重进行加权处理，得到所述第二子指纹图像，这里不再赘述。
以图11为例进行说明，可以基于曝光时长1，曝光时长2和曝光时长3采集三个第一指纹图像，以及基于曝光时长4，曝光时长5和曝光时长6采集三个第二指纹图像，进一步可以根据该三个第一指纹图像中的第一区域中的局部指纹图像确定第一子指纹图像，以及根据该三个第二指纹图像的第二区域中的局部指纹图像确定第二子指纹图像，然后可以将所述第一子指纹图像和所述第二字指纹图像进行拼接，得到所述目标指纹图像。
可选地，所述曝光时长1，曝光时长2和曝光时长3可以相等，或者也可以不等，该曝光时长1，曝光时长2和曝光时长3可以对应同一有效图像区域，也就是说，在该有效图像区域中的像素点基于该曝光时长1，曝光时长2和曝光时长3采集的像素值都在线性范围内。类似地，对于所述曝光时长4，曝光时长5和曝光时长6亦是如此，这里不再赘述。
应理解，在一些实施例中，该指纹检测的装置可以基于多个曝光时长采集多个完整的指纹图像，在另一些实施例中，也可以基于多个曝光时长采集多个局部指纹图像，该局部指纹图像为曝光时长对应的有效图像区域中的指纹图像。
继续参见图4，在一种实现方式中，可以基于曝光时长1和曝光时长2分别采集完整的指纹图像1和指纹图像2，然后使用该指纹图像1和指纹图像2中的局部指纹图像进行拼接；在另一种实现方式中，可以基于曝光时长1和曝光时长2分别采集局部指纹图像1和局部指纹图像2，其中，该局部指纹图像1为该曝光时长1对应的有效图像区域中的指纹图像，该局部指纹图像2为该曝光时长2对应的有效图像区域中的指纹图像，在该实现方式中，只需关闭像素阵列中的部分像素点即可，例如，采集局部指纹图像1时关闭其他区域中的像素点，采集局部指纹图像2时关闭其他区域中的像素点，从而能够降低指纹采集的功耗。
应理解，以上实施例中指纹图像的个数仅为示例，本申请实施例中，也可以采集其他个数个指纹图像，用于确定所述目标指纹图像，例如，4个，5个或更多个，参见图5至图10中的示例。
还应理解，以上所述多个局部指纹图像的个数，或者有效图像区域的个数仅为示例，本申请实施例对此并不特别限定，例如，可以根据更多个局部 指纹图像进行拼接，得到所述目标指纹图像，例如，3个(如图5至图8所示)或更多个(如图9或图10所示)。
需要说明的是，本申请实施例并不特别限定用于拼接目标指纹图像的局部指纹图像所对应的区域(或者说，有效图像区域)的形状，例如，可以为圆形，三角形，矩形，或者其他规则或不规则的形状，如图5至图10中的示例。
在本申请实施例中，可以根据光学指纹传感器的像素阵列的不同区域中的像素点采集的指纹图像的像素值、饱和度、对比度和锐度中的至少一项，确定采集该区域中的局部指纹图像的光学参数。
以根据指纹图像的像素值确定曝光时长为例进行说明，可以将像素阵列划分为多个区域，例如可以根据像素阵列中不同区域的感光程度，将像素阵列划分为多个区域。进一步可以通过多个曝光时长采集指纹图像，建立该多个区域中的像素点采集的指纹图像的像素值和该多个曝光时长的变化曲线，每个区域可以对应一条变化曲线，例如，如图2所示，然后根据该变化曲线，确定采集该区域的局部指纹图像的曝光时长，基于该曝光时长采集的指纹图像中该区域的局部指纹图像可以进一步用于拼接目标指纹图像。
图12示出了采用单一曝光时长和采用多个曝光时长进行指纹图像采集得到指纹图像的信号量分布图。在图12中，采用多个第一曝光时长，采集多帧第一指纹图像，例如，如图11中所示的基于曝光时长1，曝光时长2和曝光时长3采集多个指纹图像，以及基于多个第二曝光时长，采集多帧第二指纹图像，例如，如图11中所示的基于曝光时长4，曝光时长5和曝光时长6采集多个指纹图像，进一步将该多帧第一指纹图像和所述多帧第二指纹图像进行拼接，得到目标指纹图像，即组合的指纹图像。
从图12可以看出，采用多个曝光时长进行指纹图像采集，进而拼接得到的目标指纹图像(对应于图中的组合结果)相对于采用单一曝光时长采集的指纹图像而言，边缘区域的信号量得到提升，优化了整帧指纹图像的清晰度，从而能够提升指纹识别率，在具体实现中，拒真率(False Rejection Rate，FRR)指标优化2～3％。
以上，结合图3至图12，详细描述了本申请的方法实施例，下文结合图13至图16，详细描述本申请的装置实施例，应理解，装置实施例与方法实施例相互对应，类似的描述可以参照方法实施例。
如图13所示，该指纹检测的装置500可以包括：
光学指纹传感器510，用于用于基于多个光学参数分别采集多个指纹图像，其中所述光学参数包括曝光时长和光强中的至少一个，所述指纹图像是所述光学指纹传感器基于指纹检测信号获得的，所述曝光时长为所述光学指纹传感器采集所述指纹检测信号的时长，所述光强为激励光源发射的用于指纹检测的光信号的强度；
处理模块520，用于根据多个局部指纹图像进行拼接，得到用于指纹识别的目标指纹图像；
其中，所述多个局部指纹图像来自所述多个指纹图像中的不同的指纹图像，所述多个局部指纹图像的区域至少部分不重叠，所述多个局部指纹图像对应不同的光学参数。
可选地，在一些实施例中，所述光学指纹传感器用于设置在电子设备的显示屏下方以检测所述显示屏上方的人体手指的指纹图像，所述指纹检测信号是所述激励光源发射的光信号在所述显示屏上方的人体手指发生反射或散射而形成并且穿过所述显示屏被所述光学指纹传感器接收的光信号。
可选地，在一些实施例中，所述显示屏为OLED显示屏，所述光学指纹传感器的指纹检测区域位于所述OLED显示屏的显示区域，且所述激励光源包括所述OLED显示屏在所述指纹检测区域的部分显示单元，如图13所示。
可选地，在一些实施例中，所述激励光源为所述装置500的内置或外置光源540，例如，如图14所示。
可选地，在一些实施例中，所述局部指纹图像是通过控制所述OLED显示屏与所述局部指纹图像相对应的显示单元发光并利用所述光学指纹传感器进行采集获取的，其中，所述曝光时长与所述显示单元在作为所述激励光源时的发光时间相对应，或者，所述光强为所述显示单元的发光光强。
可选地，在一些实施例中，所述装置500还包括：
光源驱动模块，用于驱动所述激励光源向所述指纹检测区域分别发射所述多个光强的光信号。
可选地，在一些实施例中，所述光源驱动模块为用于驱动所述显示屏进行画面显示的显示驱动模块或者显示驱动器。
可选地，本申请实施例中，该装置500还可以包括光学组件530，在图13和图14所示的实施例中，所述光学组件530可以具体包括一个或者多个 光学透镜，其可以将穿过所述显示屏230的反射光信号或者指纹检测信号汇聚或者导引到所述光学指纹传感器510。具体地，该光学组件530可以为图1中的光学组件132，这里不再赘述。
可选地，在一些实施例中，所述处理模块520可以具体为配置在所述指纹检测的装置500中的微处理器，或者，也可以为所述指纹检测的装置10所应用的终端设备的应用处理器或者其他处理器或控制器。
可选地，在一些实施例中，所述光学指纹传感器510具体用于：
基于至少一个第一曝光时长，采集至少一个第一指纹图像；以及
基于至少一个第二曝光时长，采集至少一个第二指纹图像。
可选地，在一些实施例中，所述光学指纹传感器510具体用于：
基于至少一个第一光强，采集至少一个第一指纹图像；以及
基于至少一个第二光强，采集至少一个第二指纹图像。
可选地，在一些实施例中，所述处理模块520具体用于：根据所述至少一个第一指纹图像的第一区域中的局部指纹图像，确定第一子指纹图像；
根据所述至少一个第二指纹图像的第二区域中的局部指纹图像，确定第二子指纹图像；
根据所述第一子指纹图像和所述第二子指纹图像进行拼接，得到所述目标指纹图像。
可选地，在一些实施例中，所述处理模块520还用于：
若所述至少一个第一指纹图像包括一个第一指纹图像，将所述第一指纹图像的第一区域中的局部指纹图像确定为所述第一子指纹图像；或者
若所述至少一个第一指纹图像包括多个第一指纹图像，对所述多个第一指纹图像的第一区域中的局部指纹图像进行处理，得到所述第一子指纹图像。
可选地，在一些实施例中，所述处理模块520具体用于：
对所述多个第一指纹图像的第一区域中的局部指纹图像进行求平均值，求最大值，或按照特定的权重进行加权处理，得到所述第一子指纹图像。
可选地，在一些实施例中，所述至少一个第一曝光时长相等，或所述至少一个第一曝光时长不等；或者
所述至少一个第二曝光时长相等，或所述至少一个第二曝光时长不等。
可选地，在一些实施例中，所述多个局部指纹图像包括第一局部指纹图像和第二局部指纹图像，所述第一局部指纹图像的区域比所述第二局部指纹 图像的区域更靠近指纹图像的中心区域，所述第一局部指纹图像对应的曝光时长小于所述第二局部指纹图像对应的曝光时长，或所述第一局部指纹图像对应的光强小于所述第二局部指纹图像对应的光强。
可选地，在一些实施例中，所述目标指纹图像是由多个子指纹图像拼接得到的，按照所述多个子指纹图像与指纹图像的中心由远到近的顺序，所述多个子指纹图像对应的曝光时长依次递减，或所述多个子指纹图像对应的光强依次递减。
可选地，在一些实施例中，所述多个光学参数是根据所述光学指纹传感器的像素阵列中不同区域的像素点采集的指纹图像的像素值、饱和度、对比度和锐度中的至少一项确定的。
所述多个局部指纹图像对应的区域为同心圆或共中心的矩形环。
本申请实施例还提供了一种电子设备800，如图16所示，所述电子设备800可以包括显示屏820以及上述指纹检测的装置810，该指纹检测的装置810可以为前述实施例中的指纹检测的装置500，并设置在所述显示屏820的下方。
应理解，在本申请实施例中，该指纹检测的装置810可以用于执行前述方法实施例中的内容，为了简洁，这里不再赘述。
作为一种可选的实施例，所述显示屏820具有自发光显示单元，所述自发光显示单元可以作为所述指纹检测的装置810用于进行指纹检测的激励光源。
应理解，在本申请的方法实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
应理解，本申请实施例的处理器或处理模块可以是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法实施例的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器可以是通用处理器、数字信号处理器(Digital Signal Processor，DSP)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现成可编程门阵列(Field Programmable Gate Array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以 是任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的信息，结合其硬件完成上述方法的步骤。
可以理解，本申请实施例的电子设备还可以包括存储器，存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(Read-Only Memory，ROM)、可编程只读存储器(Programmable ROM，PROM)、可擦除可编程只读存储器(Erasable PROM，EPROM)、电可擦除可编程只读存储器(Electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(Random Access Memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(Static RAM，SRAM)、动态随机存取存储器(Dynamic RAM，DRAM)、同步动态随机存取存储器(Synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(Double Data Rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(Enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(Synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(Direct Rambus RAM，DR RAM)。应注意，本文描述的***和方法的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
本申请实施例还提出了一种计算机可读存储介质，该计算机可读存储介质存储一个或多个程序，该一个或多个程序包括指令，该指令当被包括多个应用程序的便携式电子设备执行时，能够使该便携式电子设备执行图3所示实施例的方法。
本申请实施例还提出了一种计算机程序，该计算机程序包括指令，当该计算机程序被计算机执行时，使得计算机可以执行图3所示实施例的方法。
本申请实施例还提供了一种芯片，该芯片包括输入输出接口、至少一个处理器、至少一个存储器和总线，该至少一个存储器用于存储指令，该至少一个处理器用于调用该至少一个存储器中的指令，以执行图3所示实施例的方法。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的***、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应所述理解到，所揭露的***、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个***，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者所述技术方案的部分可以以软件产品的形式体现出来，所述计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应所述以权利要求的保护范围为准。

Claims (29)

  1. 一种指纹检测的方法，其特征在于，所述指纹检测的方法包括：
    基于多个光学参数分别采集多个指纹图像，其中，所述光学参数包括曝光时长和光强中的至少一个，所述指纹图像是光学指纹传感器基于指纹检测信号获得的，所述曝光时长为所述光学指纹传感器采集所述指纹检测信号的时长，所述光强为激励光源发射的用于指纹检测的光信号的强度；
    根据多个局部指纹图像进行拼接，得到用于指纹识别的目标指纹图像；
    其中，所述多个局部指纹图像来自所述多个指纹图像中的不同的指纹图像，所述多个局部指纹图像的区域至少部分不重叠，所述多个局部指纹图像对应不同的光学参数。
  2. 根据权利要求1所述的方法，其特征在于，所述光学指纹传感器用于设置在电子设备的显示屏下方以检测所述显示屏上方的人体手指的指纹图像，所述指纹检测信号是所述激励光源发射的光信号在所述显示屏上方的人体手指发生反射或散射而形成并且穿过所述显示屏被所述光学指纹传感器接收的光信号。
  3. 根据权利要求2所述的方法，其特征在于，所述显示屏为OLED显示屏，所述光学指纹传感器的指纹检测区域位于所述OLED显示屏的显示区域，且所述激励光源包括所述OLED显示屏在所述指纹检测区域的部分显示单元。
  4. 根据权利要求3所述的方法，其特征在于，所述局部指纹图像是通过控制所述OLED显示屏与所述局部指纹图像相对应的显示单元发光并利用所述光学指纹传感器进行采集获取的；其中，所述曝光时长与所述显示单元在作为所述激励光源时的发光时间相对应，或者，所述光强为所述显示单元的发光光强。
  5. 根据权利要求1至4中任一项所述的方法，其特征在于，所述基于多个光学参数分别采集多个指纹图像，包括：
    基于至少一个第一曝光时长，采集至少一个第一指纹图像；以及
    基于至少一个第二曝光时长，采集至少一个第二指纹图像。
  6. 根据权利要求1至5中任一项所述的方法，其特征在于，所述基于多个光学参数分别采集多个指纹图像，包括：
    基于至少一个第一光强，采集至少一个第一指纹图像；以及
    基于至少一个第二光强，采集至少一个第二指纹图像。
  7. 根据权利要求5或6所述的方法，其特征在于，所述根据多个局部指纹图像进行拼接，得到用于指纹识别的目标指纹图像，包括：
    根据所述至少一个第一指纹图像的第一区域中的局部指纹图像，确定第一子指纹图像；
    根据所述至少一个第二指纹图像的第二区域中的局部指纹图像，确定第二子指纹图像；
    根据所述第一子指纹图像和所述第二子指纹图像进行拼接，得到所述目标指纹图像。
  8. 根据权利要求7所述的方法，其特征在于，所述根据所述至少一个第一指纹图像的第一区域中的局部指纹图像，确定第一子指纹图像，包括：
    若所述至少一个第一指纹图像包括一个第一指纹图像，将所述第一指纹图像的第一区域中的局部指纹图像确定为所述第一子指纹图像；或者
    若所述至少一个第一指纹图像包括多个第一指纹图像，对所述多个第一指纹图像的第一区域中的局部指纹图像进行处理，得到所述第一子指纹图像。
  9. 根据权利要求8所述的方法，其特征在于，所述对所述多个第一指纹图像的第一区域中的局部指纹图像进行处理，得到所述第一子指纹图像，包括：
    对所述多个第一指纹图像的第一区域中的局部指纹图像进行求平均值，求最大值，或按照特定的权重进行加权处理，得到所述第一子指纹图像。
  10. 根据权利要求1至9中任一项所述的方法，其特征在于，所述多个局部指纹图像包括第一局部指纹图像和第二局部指纹图像，所述第一局部指纹图像的区域比所述第二局部指纹图像的区域更靠近指纹图像的中心区域，所述第一局部指纹图像对应的曝光时长小于所述第二局部指纹图像对应的曝光时长，或所述第一局部指纹图像对应的光强小于所述第二局部指纹图像对应的光强。
  11. 根据权利要求1至10中任一项所述的方法，其特征在于，所述目标指纹图像是由多个子指纹图像拼接得到的，按照所述多个子指纹图像与指纹图像的中心由远到近的顺序，所述多个子指纹图像对应的曝光时长依次递减，或所述多个子指纹图像对应的光强依次递减。
  12. 根据权利要求1至11中任一项所述的方法，其特征在于，所述多 个光学参数是根据所述光学指纹传感器的像素阵列中不同区域的像素点采集的指纹图像的像素值、饱和度、对比度和锐度中的至少一项确定的。
  13. 根据权利要求1至12中任一项所述的方法，其特征在于，所述多个局部指纹图像对应的区域为同心圆或共中心的矩形环。
  14. 一种指纹检测的装置，其特征在于，包括：
    光学指纹传感器，用于基于多个光学参数分别采集多个指纹图像，其中所述光学参数包括曝光时长和光强中的至少一个，所述指纹图像是所述光学指纹传感器基于指纹检测信号获得的，所述曝光时长为所述光学指纹传感器采集所述指纹检测信号的时长，所述光强为激励光源发射的用于指纹检测的光信号的强度；
    处理模块，用于根据多个局部指纹图像进行拼接，得到用于指纹识别的目标指纹图像；
    其中，所述多个局部指纹图像来自所述多个指纹图像中的不同的指纹图像，所述多个局部指纹图像的区域至少部分不重叠，所述多个局部指纹图像对应不同的光学参数。
  15. 根据权利要求14所述的装置，其特征在于，所述光学指纹传感器用于设置在电子设备的显示屏下方以检测所述显示屏上方的人体手指的指纹图像，所述指纹检测信号是所述激励光源发射的光信号在所述显示屏上方的人体手指发生反射或散射而形成并且穿过所述显示屏被所述光学指纹传感器接收的光信号。
  16. 根据权利要求15所述的装置，其特征在于，所述显示屏为OLED显示屏，所述光学指纹传感器的指纹检测区域位于所述OLED显示屏的显示区域，且所述激励光源包括所述OLED显示屏在所述指纹检测区域的部分显示单元。
  17. 根据权利要求16所述的装置，其特征在于，所述局部指纹图像是通过控制所述OLED显示屏与所述局部指纹图像相对应的显示单元发光并利用所述光学指纹传感器进行采集获取的，其中，所述曝光时长与所述显示单元在作为所述激励光源时的发光时间相对应，或者，所述光强为所述显示单元的发光光强。
  18. 根据权利要求14至17中任一项所述的装置，其特征在于，所述光学指纹传感器具体用于：
    基于至少一个第一曝光时长，采集至少一个第一指纹图像；以及
    基于至少一个第二曝光时长，采集至少一个第二指纹图像。
  19. 根据权利要求14至18中任一项所述的装置，其特征在于，所述光学指纹传感器具体用于：
    基于至少一个第一光强，采集至少一个第一指纹图像；以及
    基于至少一个第二光强，采集至少一个第二指纹图像。
  20. 根据权利要求18或19所述的装置，其特征在于，所述处理模块具体用于：根据所述至少一个第一指纹图像的第一区域中的局部指纹图像，确定第一子指纹图像；
    根据所述至少一个第二指纹图像的第二区域中的局部指纹图像，确定第二子指纹图像；
    根据所述第一子指纹图像和所述第二子指纹图像进行拼接，得到所述目标指纹图像。
  21. 根据权利要求20所述的装置，其特征在于，所述处理模块还用于：
    若所述至少一个第一指纹图像包括一个第一指纹图像，将所述第一指纹图像的第一区域中的局部指纹图像确定为所述第一子指纹图像；或者
    若所述至少一个第一指纹图像包括多个第一指纹图像，对所述多个第一指纹图像的第一区域中的局部指纹图像进行处理，得到所述第一子指纹图像。
  22. 根据权利要求21所述的装置，其特征在于，所述处理模块具体用于：
    对所述多个第一指纹图像的第一区域中的局部指纹图像进行求平均值，求最大值，或按照特定的权重进行加权处理，得到所述第一子指纹图像。
  23. 根据权利要求14至22中任一项所述的装置，其特征在于，所述多个局部指纹图像包括第一局部指纹图像和第二局部指纹图像，所述第一局部指纹图像的区域比所述第二局部指纹图像的区域更靠近指纹图像的中心区域，所述第一局部指纹图像对应的曝光时长小于所述第二局部指纹图像对应的曝光时长，或所述第一局部指纹图像对应的光强小于所述第二局部指纹图像对应的光强。
  24. 根据权利要求14至23中任一项所述的装置，其特征在于，所述目标指纹图像是由多个子指纹图像拼接得到的，按照所述多个子指纹图像与指纹图像的中心由远到近的顺序，所述多个子指纹图像对应的曝光时长依次递 减，或所述多个子指纹图像对应的光强依次递减。
  25. 根据权利要求14至24中任一项所述的装置，其特征在于，所述多个光学参数是根据所述光学指纹传感器的像素阵列中不同区域的像素点采集的指纹图像的像素值、饱和度、对比度和锐度中的至少一项确定的。
  26. 根据权利要求14至25中任一项所述的装置，其特征在于，所述多个局部指纹图像对应的区域为同心圆或共中心的矩形环。
  27. 根据权利要求14至26中任一项所述的装置，其特征在于，所述装置还包括：
    光源驱动模块，用于驱动所述激励光源向所述指纹检测区域分别发射所述多个光强的光信号。
  28. 根据权利要求27所述的装置，其特征在于，所述光源驱动模块为用于驱动所述显示屏进行画面显示的显示驱动模块或者显示驱动器。
  29. 一种电子设备，其特征在于，包括显示屏和设置在所述显示屏下方的指纹检测的装置，其中，所述指纹检测的装置为如权利要求14至28中任一项所述的指纹检测的装置。
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