WO2020102945A1 - Procédé, appareil et dispositif électronique pour identification d'empreintes digitales - Google Patents

Procédé, appareil et dispositif électronique pour identification d'empreintes digitales

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Publication number
WO2020102945A1
WO2020102945A1 PCT/CN2018/116234 CN2018116234W WO2020102945A1 WO 2020102945 A1 WO2020102945 A1 WO 2020102945A1 CN 2018116234 W CN2018116234 W CN 2018116234W WO 2020102945 A1 WO2020102945 A1 WO 2020102945A1
Authority
WO
WIPO (PCT)
Prior art keywords
fingerprint
image
area
predetermined pattern
target image
Prior art date
Application number
PCT/CN2018/116234
Other languages
English (en)
Chinese (zh)
Inventor
蒋鹏
Original Assignee
深圳市汇顶科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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 PCT/CN2018/116234 priority Critical patent/WO2020102945A1/fr
Priority to CN201880002304.8A priority patent/CN109643379B/zh
Publication of WO2020102945A1 publication Critical patent/WO2020102945A1/fr

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • 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
    • G06V40/1365—Matching; Classification
    • 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
    • G06V40/13—Sensors therefor
    • G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2354/00—Aspects of interface with display user

Definitions

  • the present application relates to the field of fingerprint identification technology, and more specifically, to a fingerprint identification method, device, and electronic device.
  • optical fingerprint recognition devices brings users a safe and convenient user experience, but forged fingerprints such as fingerprint molds made of artificial materials (such as silicone, white glue, etc.) are a security risk in fingerprint applications.
  • forged fingerprints such as fingerprint molds made of artificial materials (such as silicone, white glue, etc.) are a security risk in fingerprint applications.
  • By forging fingerprints A fingerprint image with a high degree of similarity to a real fingerprint can be obtained. Therefore, how to identify the true and false fingerprints collected by the optical fingerprint recognition device to improve the security of fingerprint recognition is an urgent problem to be solved.
  • Embodiments of the present application provide a fingerprint identification method, device, and electronic equipment, which can effectively identify true and false fingerprints and improve the security of fingerprint identification.
  • a fingerprint recognition method which includes: when an object to be recognized presses at least one predetermined pattern sequentially displayed on a fingerprint detection area of a display screen, collecting at least one fingerprint image of the object to be recognized, wherein each Each fingerprint image corresponds to a predetermined pattern, and the intensity of the optical signal corresponding to the first area in the predetermined pattern is greater than the intensity of the optical signal corresponding to the second area in the predetermined pattern; based on the at least one fingerprint image, the A target image and / or a second target image, wherein the first target image includes an image formed by the optical signal reflected by the optical signal corresponding to the at least one predetermined pattern on the surface of the object to be identified, the second The target image is an image formed by the optical signal scattered by the optical signal corresponding to the at least one predetermined pattern inside the object to be identified; based on the first target image and / or the second target image, the target image is determined Identify whether the object is a real finger.
  • the at least one predetermined pattern includes a plurality of predetermined patterns
  • the At least one fingerprint image includes: sequentially displaying each of the plurality of predetermined patterns in the fingerprint detection area of the display screen; and collecting a corresponding one of the fingerprint images based on each predetermined pattern.
  • the multiple predetermined patterns are obtained by phase shifting the same pattern, and the superimposed pattern of the multiple predetermined patterns is a single color pattern.
  • the plurality of predetermined patterns include a first predetermined pattern and a second predetermined pattern
  • the fingerprint detection area of the display screen sequentially displays each of the plurality of predetermined patterns Including: controlling to turn on only the optical signal in the area where the fingerprint ridge pattern in the target fingerprint image is located to display the first predetermined pattern; or controlling to only turn on the optical signal in the area where the fingerprint valley pattern in the target fingerprint image is located To form the second predetermined pattern; wherein the target fingerprint image is a fingerprint image collected based on a predetermined pattern of a single color.
  • the plurality of predetermined patterns are a plurality of stripe patterns or a plurality of checkerboard patterns.
  • the determining the first target image and / or the second target image based on the at least one fingerprint image includes: multiple fingerprint images corresponding to the multiple fringe images, and the The phase relationship of multiple fringe images determines the first target image and / or the second target image.
  • the determining the first target image and / or the second target image based on the at least one fingerprint image includes:
  • the imaging area of the light signal reflected by the area, the dark light area of each fingerprint image is the imaging area of the light signal reflected by the second area of the predetermined pattern corresponding to each fingerprint image; according to the The fingerprint information of the bright light area and the fingerprint information of the dark light area determine the first target image and / or the second target image, wherein the fingerprint information of the bright light area of the fingerprint image includes a predetermined corresponding to the fingerprint image
  • the determining whether the object to be identified is a real finger according to the first target image and / or the second target image includes: according to the first target image and / or The second target image and the reference fingerprint image determine a first scale and / or a second scale, wherein the reference fingerprint image corresponds to a predetermined pattern of a single color; according to the first scale and / or the second scale Ratio to determine whether the object to be recognized is a real finger.
  • the determining the first ratio and / or the second ratio based on the first target image and / or the second target image and the reference fingerprint image includes: determining the reference fingerprint The first average value of the sample value of each pixel in the image; the ratio of the second average value of the sample value of all pixels in the first target image to the first average value is determined as the first A ratio; and / or determine the ratio of the third average value of the sampling values of all pixels in the second target image to the first average value as the second ratio.
  • the determining whether the object to be identified is a real finger according to the first ratio and / or the second ratio includes: if the first ratio is within a first preset range And / or the second ratio is within a second preset range, determining that the object to be recognized is a real finger.
  • the at least one predetermined pattern is formed by an optical signal emitted by a light source in the fingerprint detection area, where the light source includes at least one of a red light source, a green light source, and a blue light source.
  • the light source is a partial self-luminous display unit of the display screen in the fingerprint detection area
  • the red light source, the green light source, and the blue light source are the display, respectively The red display unit, green display unit and blue display unit of the screen.
  • the method further includes: controlling to turn on the self-luminous display unit in the first area of the fingerprint detection area, and turning off the self-luminous display unit in the second area to form a Each predetermined pattern of the at least one predetermined pattern.
  • the wavelength of the corresponding optical signal of the pattern in the first area is the center wavelength of the optical fingerprint sensor used for fingerprint collection.
  • a fingerprint recognition device comprising: an optical fingerprint sensor for collecting at least one object to be recognized when the object to be recognized presses at least one predetermined pattern sequentially displayed on the fingerprint detection area of the display screen Fingerprint images, each fingerprint image corresponding to a predetermined pattern, wherein the intensity of the optical signal corresponding to the first area in the predetermined pattern is greater than the intensity of the optical signal corresponding to the second area in the predetermined pattern; wherein, the At least one fingerprint image is used to determine a first target image and / or a second target image, the first target image and / or the second target image is used to determine whether the object to be recognized is a real finger, the first A target image includes an image of an optical signal reflected by the optical signal corresponding to the at least one predetermined pattern on the surface of the object to be recognized, and the second target image includes an optical signal corresponding to the at least one predetermined pattern at the An image formed by light signals scattered inside the object to be identified.
  • the at least one predetermined pattern includes a plurality of predetermined patterns
  • the optical fingerprint sensor is specifically configured to: sequentially display each of the plurality of predetermined patterns in a fingerprint detection area of the display screen When the pattern is predetermined, a corresponding fingerprint image is collected based on each predetermined pattern.
  • the multiple predetermined patterns are obtained by phase shifting the same pattern, and the superimposed pattern of the multiple predetermined patterns is a single color pattern.
  • the plurality of predetermined patterns include a first predetermined pattern and a second predetermined pattern
  • the first area in the first predetermined pattern is the area where the fingerprint ridge pattern in the target fingerprint image is located
  • the The second area in the first predetermined pattern is the area where the fingerprint valley pattern in the target fingerprint image is located
  • the first area in the second predetermined pattern is the area where the fingerprint valley pattern in the target fingerprint image is located
  • the The second area in the second predetermined pattern is an area where the fingerprint ridge pattern in the target fingerprint image is located
  • the target fingerprint image is a fingerprint image collected based on a predetermined pattern of a single color.
  • the plurality of predetermined patterns are a plurality of stripe patterns or a plurality of checkerboard patterns.
  • the fingerprint identification device further includes: a processor, configured to determine a fingerprint based on a plurality of fingerprint images corresponding to the plurality of stripe images and a phase relationship between the plurality of stripe images The first target image and / or the second target image.
  • the processor is further configured to: extract fingerprint information of a bright light area and fingerprint information of a dark light area of each fingerprint image in the plurality of fingerprint images, wherein each fingerprint The bright area of the image is the imaging area of the light signal reflected by the first area of the predetermined pattern corresponding to the fingerprint image, and the dark area of each fingerprint image is the second area of the predetermined pattern corresponding to each fingerprint image The imaging area of the reflected optical signal;
  • the fingerprint information of the bright area of the fingerprint image Including the fingerprint information carried by the optical signal corresponding to the predetermined pattern corresponding to the fingerprint image on the surface of the object to be identified and the optical signal corresponding to the predetermined pattern corresponding to the fingerprint image to be scattered inside the object to be identified The fingerprint information carried by the optical signal.
  • the processor is further configured to determine the first ratio and / or the second ratio based on the first target image and / or the second target image and the reference fingerprint image, wherein ,
  • the reference fingerprint image corresponds to a predetermined pattern of a single color; according to the first scale and / or the second scale, it is determined whether the object to be recognized is a real finger.
  • the processor is further configured to: determine a first average value of the sampled value of each pixel in the reference fingerprint image; compare all pixels in the first target image The ratio of the second average value of the sampled values to the first average value is determined as the first ratio; and / or the third average value of the sampled values of all pixels in the second target image and the The ratio of the first average value is determined as the second ratio.
  • the processor is further configured to: if the first ratio is within a first preset range, and / or the second ratio is within a second preset range, determine the pending Recognize objects as real fingers.
  • the wavelength of the corresponding optical signal of the pattern in the first area is the center wavelength of the optical fingerprint sensor used for fingerprint collection.
  • the at least one predetermined pattern is formed by an optical signal emitted by a light source in the fingerprint detection area, where the light source includes at least one of a red light source, a green light source, and a blue light source.
  • the light source is a partial self-luminous display unit of the display screen in the fingerprint detection area
  • the red light source, the green light source, and the blue light source are the display, respectively The red display unit, green display unit and blue display unit of the screen.
  • the device further includes: a light source driving module for controlling to turn on the self-luminous display unit in the first area of the fingerprint detection area and turn off the self-luminous light in the second area The display unit to form each predetermined pattern.
  • an electronic device including the fingerprint recognition device in the second aspect or any possible implementation manner of the second aspect.
  • the fingerprint recognition device may collect a corresponding fingerprint image according to a predetermined pattern with light and dark differences, and may further determine the light signal reflected from the surface of the object to be recognized and the light scattered from the object according to the fingerprint image
  • the image formed by the signal can determine whether the object to be recognized is a real finger according to the characteristics of the two parts of the optical signal, thereby improving the security of fingerprint recognition.
  • FIG. 1 is a schematic plan view of an electronic device to which this application can be applied.
  • Fig. 2 is a schematic partial cross-sectional view of the electronic device shown in Fig. 1 along A-A '.
  • FIG. 3 is a schematic diagram of a fingerprint identification device according to an embodiment of the present application.
  • FIG. 4 is a schematic diagram of several predetermined patterns according to an embodiment of the present application.
  • FIG. 5 is a schematic flowchart of a fingerprint identification method according to an embodiment of the present application.
  • FIG. 6 is a schematic diagram of a fingerprint image collected based on three sinusoidal stripe patterns.
  • FIG. 7 is a schematic block diagram of an electronic device according to an embodiment of the present application.
  • the optical fingerprint system provided by the embodiments of the present application can be applied to smartphones, tablet computers, and other mobile terminals or other terminal devices with display screens; more specifically, in the above terminal devices, fingerprint recognition
  • the device may specifically be an optical fingerprint recognition device, which may be disposed in a partial area or all areas below the display screen, thereby forming an under-display (Under-display or Under-screen) optical fingerprint system.
  • the technical solutions of the embodiments of the present application may also perform other fingerprint recognition based on the principle of optical imaging, for example, face recognition, etc. This embodiment of the present application is not limited thereto.
  • FIG. 1 and 2 show a schematic diagram of an electronic device 100 to which the fingerprint identification device according to an embodiment of the present application can be applied, wherein FIG. 1 is a schematic front view of the electronic device 100, and FIG. 2 is AA 'partial cross-sectional structure diagram.
  • the electronic device 100 includes a display screen 120 and an optical fingerprint recognition device (hereinafter also simply referred to as a fingerprint recognition device) 130, wherein the optical fingerprint recognition device 130 has one or more sensors An array, the sensing array is at least disposed in a partial area below the display screen 120, so that the fingerprint collection area (or sensing area) 103 of the optical fingerprint recognition device 130 is at least partially located in the display area 102 of the display screen 120 .
  • a fingerprint recognition device 130 hereinafter also simply referred to as a fingerprint recognition device 130
  • the optical fingerprint recognition device 130 has one or more sensors An array, the sensing array is at least disposed in a partial area below the display screen 120, so that the fingerprint collection area (or sensing area) 103 of the optical fingerprint recognition device 130 is at least partially located in the display area 102 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 recognition 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 gathering or reflection ,
  • the area of the fingerprint detection area 103 of the optical fingerprint identification device 130 can be larger than the area of the sensing array of the optical fingerprint identification device 130.
  • the fingerprint detection area 103 of the optical fingerprint identification device 130 may also be designed to be consistent with the area of the sensing array of the optical fingerprint identification device 130.
  • the fingerprint detection area 103 is located in the display area 102 of the display screen 120. Therefore, when the user needs to unlock the electronic device or other fingerprint verification, he only needs to press his finger Fingerprint input can be realized in the fingerprint detection area 103 located on the display screen 120. Since fingerprint detection can be implemented within the screen, the electronic device 100 adopting the above structure does not require a special reserved space on the front to set fingerprint keys (such as the Home key), so that a full screen solution can be adopted, that is, the display area of the display screen 120 102 can be basically extended to the front of the entire electronic device 100.
  • the display screen 120 may be a self-luminous display screen, which uses a self-luminous display unit as a display pixel, such as an organic light-emitting diode (Organic Light-Emitting Diode, OLED) display screen or a micro light-emitting diode (Micro- LED) display.
  • a self-luminous display unit such as an organic light-emitting diode (Organic Light-Emitting Diode, OLED) display screen or a micro light-emitting diode (Micro- LED) display.
  • OLED Organic Light-Emitting Diode
  • Micro- LED micro light-emitting diode
  • the optical fingerprint recognition device 130 may also use an internal light source or an external light source to provide an optical signal for fingerprint detection.
  • the optical fingerprint recognition device 130 may be applied to a non-self-luminous display, such as a liquid crystal display (Liquid Crystal Display, LCD) or other passive light-emitting display.
  • a non-self-luminous display such as a liquid crystal display (Liquid Crystal Display, LCD) or other passive light-emitting display.
  • LCD Liquid Crystal Display
  • the optical fingerprint system of the electronic device 100 may further 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 a non-visible light of a specific wavelength, which may be provided under the backlight module of the liquid crystal display screen or the edge area under the protective cover of the electronic device 100, and the The optical fingerprint recognition device 130 may be disposed under the edge area of the liquid crystal panel or the protective cover and guided by the optical path so that the fingerprint detection light can reach the optical fingerprint recognition device 130; or, the optical fingerprint recognition device 130 may also be disposed at the Under the backlight module, and the backlight module allows the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the optics through openings or other optical design of the film layers such as the diffusion sheet, the brightness enhancement sheet, the reflection sheet, etc. Fingerprint recognition device 130.
  • the sensing array of the optical fingerprint recognition device 130 is specifically a photodetector (Photodetector) array, which includes a plurality of photodetectors distributed in an array, and the photodetectors can be used as the optical sensing unit as described above.
  • a finger touches, presses, or approaches for ease of description, this application is collectively referred to as touch
  • the light emitted by the display unit of the fingerprint recognition area 103 reflects on the fingerprint on the surface of the finger and forms reflected light The reflected light of the ridges and valleys of the finger fingerprint is different.
  • the reflected light is received from the display screen 120 and received by the photodetector array and converted 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 an optical fingerprint recognition function in the electronic device 100.
  • the electronic device 100 further includes a transparent protective cover 110, and the cover 110 may be specifically a transparent cover, such as a glass cover or a sapphire cover, which is located on the display screen 120 above and covering the front of the electronic device 100. Therefore, in the embodiment of the present application, the so-called finger touch, pressing or approaching on the display screen 120 actually refers to the finger touching, pressing or approaching the cover plate 110 above the display screen 120 or covering the cover plate 110 Surface of the protective layer.
  • the electronic device 100 may further include a touch sensor, and the touch sensor may be specifically a touch panel, which may be provided on the surface of the display screen 120, or may be partially or wholly integrated into the display screen 120, namely The display screen 120 is specifically a touch display screen.
  • the touch sensor may be specifically a touch panel, which may be provided on the surface of the display screen 120, or may be partially or wholly integrated into the display screen 120, namely The display screen 120 is specifically a touch display screen.
  • the optical fingerprint recognition device 130 includes an optical detection unit 134 and an optical component 132, and the optical detection unit 134 includes the sensing array and the sensor array.
  • the reading circuit and other auxiliary circuits that are sexually connected can be fabricated on a chip (Die) through a semiconductor process; that is, the optical detection unit 134 can be fabricated on an optical imaging chip or an image sensor chip (hereinafter also referred to as an optical fingerprint) Sensor or optical fingerprint sensor chip).
  • the optical component 132 may be disposed above the sensing array of the optical detection unit 134, which may specifically include an optical filter (or filter, filter), an optical path guiding structure, and other optical elements.
  • the filter can be used to filter out the ambient light penetrating the finger, and the light path guiding structure is mainly used to guide the light path such as collimating, modulating or converging the downward propagating light to realize the reflection from the finger surface
  • the light is guided to the sensing array for optical detection.
  • the optical component 132 may be packaged with the optical detection unit 134 in the same optical fingerprint chip, or the optical component 132 may be disposed outside the chip where the optical detection unit 134 is located, such as The optical component 132 is attached to the chip, or a part of the components of the optical component 132 is integrated into the chip.
  • the optical path guiding structure of the optical component 132 has various implementation solutions, for example, it may be specifically an optical path modulator or an optical path collimator made of semiconductor silicon wafers or other substrates, which has multiple optical path modulation units or A collimating unit, the optical path modulation unit or the collimating unit may be specifically a micro-hole array.
  • the light guide layer 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 (hereinafter also referred to as a lens group).
  • the sensing array can detect the fingerprint image of the finger .
  • a circuit board 140 such as a flexible printed circuit (FPC) may also be provided under the optical fingerprint recognition device 130, and the optical fingerprint recognition device 130 may be soldered to the circuit board 140 through pads, for example.
  • the circuit board 140 realizes electrical interconnection and signal transmission with other peripheral circuits or other elements of the electronic device 100.
  • the optical fingerprint recognition device 130 may receive the control signal of the processing unit of the electronic device 100 through the circuit board 140, and may also output the fingerprint detection signal to the electronic device through the circuit board 140 100 processing unit or control unit.
  • the specific identification process of traditional fingerprint identification may be: using visible light of a certain wavelength as a light source for illuminating the fingerprint, specifically, the light source may illuminate the fingerprint detection area on the display screen, thereby forming a solid color spot, such as a green spot, in the fingerprint detection area That is, all display pixels in the fingerprint detection area are all lit.
  • the optical signal emitted by the light source is reflected by the finger in contact with the fingerprint detection area to form an optical signal containing fingerprint information.
  • the sensor receives the reflected light and uses the principle of light reflection imaging to perform fingerprint identification.
  • fingerprint molds made of artificial materials such as those made of milky white rubber, transparent rubber, black rubber or flesh-colored rubber
  • the fingerprint mold is usually made by the process of inverted mold, so the structure and material of the surface and the inside are all the same type and uniform, and the structure of the real finger is composed of different layers, including the epidermis layer, the dermis layer, and the flesh tissue And phalanx.
  • the optical signal is irradiated on the real and fake fingers, and further imaged on the optical fingerprint module.
  • the optical signal received by the optical fingerprint module mainly includes two parts. The first part is the light signal reflected from the surface of the finger, and the second part is from the inside of the finger.
  • an embodiment of the present application proposes a fingerprint recognition scheme, by forming a non-pure color spot, that is, a spot with a difference between light and dark, in the fingerprint detection area, based on the non-pure color spot, a fingerprint image is collected, and further a finger is obtained based on the fingerprint image
  • the light signal reflected from the surface and the light signal scattered from the inside of the finger can determine the true and fake fingerprints based on the difference between the two signals.
  • FIG. 3 shows a schematic diagram of a fingerprint identification device according to an embodiment of the present application.
  • the fingerprint recognition device 300 includes an optical fingerprint sensor 320 for collecting at least one object to be recognized when the object to be recognized presses at least one predetermined pattern sequentially displayed on the fingerprint detection area of the display screen A fingerprint image, wherein each fingerprint image corresponds to a predetermined pattern, and the intensity of the optical signal corresponding to the first area 312 in the predetermined pattern is greater than the intensity of the optical signal corresponding to the second area 313 in the predetermined pattern.
  • the first area 312 in the predetermined pattern is a bright light area
  • the second area 313 in the predetermined pattern is a dark light area, that is, the predetermined pattern is a pattern having a light-dark difference.
  • the at least one pattern includes a plurality of predetermined patterns
  • the bright light area and the dark light area of each predetermined pattern are different, assuming that the plurality of predetermined patterns include a first predetermined pattern and a second predetermined pattern, in one possibility
  • the bright area of the first predetermined pattern corresponds to the dark area of the second predetermined pattern.
  • the fingerprint identification device 300 may further include:
  • the optical component 330 is used for guiding or condensing the fingerprint detection signal to the optical fingerprint sensor 320, wherein the fingerprint detection signal is an optical signal corresponding to a predetermined pattern formed in the fingerprint detection area of the display screen on the surface of the object to be recognized Reflected and internally scattered light signals.
  • optical component 330 may correspond to the optical component 132 in the embodiment shown in FIG. 1.
  • the fingerprint identification device 300 may be a fingerprint identification module, corresponding to the optical fingerprint identification device 130 in FIG. 1, or the fingerprint identification device 300 may also be a fingerprint identification module Electronic equipment, which is not limited in the embodiments of the present application.
  • the at least one predetermined pattern is formed by an optical signal emitted by a light source in the fingerprint detection area, wherein the light source includes at least one of a red light source, a green light source, and a blue light source .
  • the light source is a partial self-luminous display unit 311 of the display screen in the fingerprint detection area, then the red light source, the green light source, and the blue light source are respectively The red display unit, green display unit and blue display unit of the display screen are described.
  • the light source may also be an internal light source or an external light source of the fingerprint identification module, which is not limited in the embodiments of the present application.
  • the intensity of the light signal emitted by the light source to the bright light area in the predetermined pattern may be controlled to be greater than the intensity of the light signal emitted to the dark light area to form each predetermined pattern.
  • the at least one predetermined pattern includes a first predetermined pattern, a first area of the first predetermined pattern is a bright light area and a second area of the first pattern is a dark light area, then the fingerprint detection area of the display screen displays the The first predetermined pattern may be to turn on the self-luminous display unit in the first area of the fingerprint detection area and turn off the self-luminous display unit in the second area of the fingerprint detection area, thereby forming the first predetermined pattern.
  • the at least one predetermined pattern may include a plurality of predetermined patterns, and the plurality of predetermined patterns may be light and dark complementary patterns, that is, the superimposed pattern of the plurality of patterns may be a single color Pattern, that is, a solid color spot, for example, a white spot, a cyan spot, or a green spot.
  • the plurality of predetermined patterns may be obtained by phase shifting of the same pattern, for example, the plurality of predetermined patterns include a first pattern and a second pattern, and the first pattern is a pattern with a difference in light and dark ,
  • the second pattern may be obtained by shifting the first pattern by ⁇ , or the plurality of patterns may also include more patterns, for example, the first pattern, the second pattern, and the third pattern, the second pattern and
  • the third pattern may be obtained by phase shifting the first pattern by 2 ⁇ / 3 and 4 ⁇ / 3 respectively, as long as the superimposed pattern of the plurality of predetermined patterns can be a solid color spot.
  • the phase interval is not specifically limited.
  • the plurality of predetermined patterns may be a plurality of stripe patterns with light and dark intervals, and the period of the light and dark intervals in the stripe pattern may be one or more pixels, for example, n pixels may be used as bright,
  • n pixels may be used as bright
  • multiple stripe patterns are obtained by phase shifting, for example, 3 stripe patterns, and the phase difference between each two stripe patterns is 2 ⁇ / 3.
  • the plurality of predetermined patterns may also be a checkerboard pattern with light and dark intervals.
  • the period of the light and dark intervals in the checkerboard pattern may be one or more pixels.
  • n pixels may be bright and m pixels may be dark
  • multiple checkerboard patterns are obtained by phase shifting, for example, 3 checkerboard patterns, and the phase difference between each two checkerboard patterns is 2 ⁇ / 3.
  • n and m may be the same or different, which is not limited in the embodiment of the present application, for example, n and m may be any integer from 5 to 10.
  • the plurality of predetermined patterns in the embodiment of the present application may also be other regular patterns, such as the ring pattern shown in FIG. 4, or may also be irregular patterns, and only the superimposed patterns of the plurality of predetermined patterns are solid colors
  • the light spot may be sufficient, which is not limited in the embodiments of the present application.
  • the optical fingerprint sensor 320 may sequentially collect data for the at least one At least one fingerprint image of the predetermined pattern, since the predetermined pattern is a light spot with light and dark differences, the collected fingerprint image is also an image with light and dark differences.
  • the bright light area of the fingerprint pattern it usually includes the image formed by the two parts of the optical signal described above, while for the dark light area of the fingerprint pattern, it usually includes only the image formed by the second part of the optical signal.
  • the images formed by the two parts of the optical signal can be determined and recorded as the first target image and the second target image. Further, according to the first The target image and the second target image determine the true and false fingerprints.
  • the first target image may be understood as an image formed by the optical signal reflected by the optical signal corresponding to the predetermined pattern on the surface of the object to be identified when the predetermined pattern is a solid color spot
  • the The second target image can be understood as an image formed by the light signal scattered inside the object to be identified when the predetermined pattern is a solid color spot.
  • the difference between the first target image and the second target image can be compared to determine the true and false fingerprints.
  • the difference between the first target image and the second target image can be less than It is determined to be a fake fingerprint when it is a specific threshold, and it is determined to be a real fingerprint when the difference between the first target image and the second target image is greater than a specific threshold.
  • a large number of fingerprint images of real fingers can be trained to obtain the first target image model and the second target image model corresponding to the real fingers, and then the subsequent fingerprint images of the object to be identified During false recognition, the first target image of the object to be recognized can be compared with the first target image model, and / or the second target image of the object to be recognized can be compared with the second target image model. When the image matches the first target image model, and / or the second target image matches the second target image model, it is determined to be a real fingerprint, otherwise it is determined to be a fake fingerprint.
  • the matching between the first target image and the first target image model may include that the difference between the values of corresponding pixels in the first target image and the first target image model is less than a certain threshold, or the first target image and the first target The proportion of the number of pixel points where the difference between the corresponding pixel points in the image model is less than a specific threshold is greater than a specific ratio, such as 95%.
  • a similar determination method can also be adopted for the second target image and the second target image model matching, which will not be repeated here.
  • the fingerprint identification device 300 may further include:
  • the processor is configured to determine the first target image and / or the second target image according to the plurality of fingerprint images corresponding to the plurality of predetermined patterns and the phase relationship between the plurality of predetermined patterns, further according to the The first target image and / or the second target image determine whether the object to be recognized is a real finger.
  • the plurality of predetermined patterns can be obtained by phase shifting the same pattern, then the plurality of fingerprint images obtained from the plurality of predetermined patterns also have corresponding phase relationships. Therefore, according to the The two parts of the optical signal also have corresponding phase relationships. Therefore, according to the multiple fingerprint images combined with the phase relationship, the image signals corresponding to the two parts of the optical signal can be obtained respectively.
  • the specific implementation process is combined with the specific embodiment in the method embodiment. Elaboration, no more details here.
  • the processor may be a processor of an electronic device, for example, the host module may also be a processor in a fingerprint identification module, for example, a micro control unit (Micro Control Unit, MCU), which is implemented in this application Examples are not limited to this.
  • MCU Micro Control Unit
  • the processor is specifically used to:
  • a first ratio and a second ratio are determined, and whether the object to be recognized is a real finger is determined according to the determined first ratio and the second ratio.
  • the reference fingerprint image is a fingerprint image collected based on a solid color spot.
  • a solid color spot may be displayed in a fingerprint detection area, and a fingerprint image is collected based on the solid color spot.
  • the fingerprint image may be used as the Reference fingerprint image; or, because the superimposed pattern of the plurality of predetermined patterns in the embodiment of the present application is a solid color spot, the reference fingerprint image may also be a superimposed image of multiple fingerprint images corresponding to the plurality of predetermined patterns.
  • the processor may determine the first average value of the sampling values of each pixel in the reference fingerprint image, and the second of the sampling values of all pixels in the first target image The ratio of the average value to the first average value is determined as the first ratio, and the ratio of the third average value of the sampling values of all the pixels in the second target to the first average value is determined as the second ratio. It is further determined whether the first ratio falls within the first preset range and whether the second ratio falls within the second preset range to determine whether the object to be recognized is a real finger. For example, the processor may determine that the object to be measured is a real finger when the first ratio is within the first preset range and the second ratio is within the second preset range, otherwise, determine that the object to be measured is a fake finger . Alternatively, the processor may determine that the object to be measured is a real finger when the first ratio is within the first preset range or the second ratio is within the second preset range.
  • Table 1 is a comparison of the first ratio L d _Nomal, the second ratio L g _Nomal and the ratio of the second ratio and the first ratio L g_Normal / L d_Normal determined by the fingerprint mold made of two artificial materials and the fingerprint image of the real finger table.
  • the artificial material since the artificial material has the characteristics of uniform and isotropic material, the difference between the light signal reflected from the surface of the fingerprint mold of the artificial material and the light signal scattered from the inside of the fingerprint mold is small, and the real finger includes multiple Different structures, so the difference between the light signal reflected from the surface of the finger and the light signal scattered from the inside of the finger is large.
  • the true and false fingerprints can be determined according to parameters such as the difference between the first ratio and the second ratio or the ratio between the first ratio and the second ratio.
  • the pixels or pixel units in the fingerprint detection area may refer to the self-luminous display unit or light-emitting pixels of the display screen, and the pixel points in the fingerprint image may correspond to the sensing unit in the optical fingerprint sensor.
  • the sampling value of the pixels in the image is the size of the light signal collected by the sensing unit in the optical fingerprint sensor.
  • the processor may also determine a first scale image based on the first target image and the reference fingerprint image, specifically, the first target image and the reference fingerprint image may be The ratio of the sample values of the corresponding pixels is determined as the sample values of the corresponding pixels in the first scale image, and then the average value of the sample values of all pixels in the first scale image can be determined as the first scale; similar Alternatively, the second scale image may be determined according to the second target image and the reference fingerprint image, and the average value of the sample values of corresponding pixels in the second scale image may be used as the second scale.
  • the processor may also directly determine whether the object to be recognized is a real finger based on the first scale image or the second scale image, for example, the processor may determine the first scale image and the first scale image model Whether it matches, or whether the second scale image and the second scale image model match, it is determined if the first scale image and the first scale image model match or the second scale image and the second scale image model match.
  • the processor may determine the first scale image and the first scale image model Whether it matches, or whether the second scale image and the second scale image model match, it is determined if the first scale image and the first scale image model match or the second scale image and the second scale image model match.
  • the first preset range may be determined according to the sampling values of all pixels of the first target image corresponding to the fingerprint image of a large number of real fingers and the reference fingerprint image, or may also be based on the foregoing
  • the first target image model and the reference fingerprint image determine the first preset range, for example, the range where the ratio of the values of the corresponding pixel points in the first target image model and the reference fingerprint image can be determined as the The first preset range, or the range in which the ratio between the average value of the sampling value of each pixel in the first target image model and the first average value may be determined as the first preset range.
  • the second preset range may be determined in a similar manner, and for the sake of brevity, details are not described here.
  • FIG. 5 shows a schematic flowchart of a fingerprint identification method according to an embodiment of the present application.
  • the fingerprint identification method shown in FIG. 5 may be executed by the fingerprint identification device in the foregoing embodiment.
  • the fingerprint identification method 500 may include the following steps:
  • S520 Determine a first target image and / or a second target image according to the at least one fingerprint image, where the first target image includes the optical signal reflected by the optical signal corresponding to the at least one predetermined pattern on the surface of the object to be identified
  • the second target image includes an image formed by optical signals scattered by the optical signal corresponding to the at least one predetermined pattern inside the object to be identified.
  • S530 Determine whether the object to be recognized is a real finger according to the first target image and / or the second target image.
  • the at least one predetermined pattern includes a plurality of predetermined patterns, and when the object to be recognized presses at least one predetermined pattern on the fingerprint detection area of the display screen, at least one of the objects to be recognized is collected Fingerprint images, including:
  • Each predetermined pattern of the plurality of predetermined patterns is sequentially displayed in the fingerprint detection area of the display screen, and based on each predetermined pattern, a corresponding fingerprint image is collected.
  • the plurality of predetermined patterns are obtained by phase shifting the same pattern, and the superimposed pattern of the plurality of predetermined patterns is a single color pattern.
  • the plurality of predetermined patterns include a first predetermined pattern and a second predetermined pattern
  • the fingerprint detection area of the display screen sequentially displays each of the predetermined patterns Patterns, including:
  • the target fingerprint image is a fingerprint image collected based on a predetermined pattern of a single color.
  • the plurality of predetermined patterns are a plurality of striped patterns or a plurality of checkerboard patterns.
  • the determining the first target image and / or the second target image based on the at least one fingerprint image includes:
  • the first target image and / or the second target image are determined according to the multiple fingerprint images corresponding to the multiple fringe images and the phase relationship of the multiple fringe images.
  • the determining the first target image and / or the second target image based on the at least one fingerprint image includes:
  • An imaging area of the optical signal reflected by the area, the dark light area of each fingerprint image is an imaging area of the optical signal reflected by the second area of the predetermined pattern corresponding to each fingerprint image;
  • the fingerprint information of the bright area of the fingerprint image Including the fingerprint information carried by the optical signal corresponding to the predetermined pattern corresponding to the fingerprint image on the surface of the object to be identified and the optical signal corresponding to the predetermined pattern corresponding to the fingerprint image to be scattered inside the object to be identified The fingerprint information carried by the optical signal.
  • the determining whether the object to be recognized is a real finger based on the first target image and / or the second target image includes:
  • the first ratio and / or the second ratio it is determined whether the object to be recognized is a real finger.
  • the determining the first ratio and / or the second ratio based on the first target image and / or the second target image and the reference fingerprint image includes:
  • the determining whether the object to be recognized is a real finger according to the first ratio and / or the second ratio includes:
  • the first ratio is within the first preset range and / or the second ratio is within the second preset range, it is determined that the object to be recognized is a real finger.
  • the at least one predetermined pattern is formed by an optical signal emitted by a light source in the fingerprint detection area, where the light source includes at least one of a red light source, a green light source, and a blue light source.
  • the light source is a partial self-luminous display unit of the display screen in the fingerprint detection area
  • the red light source, the green light source and the blue light source are the red display unit, the green display unit and the blue light source of the display screen, respectively Color display unit.
  • the method 500 may further include:
  • the wavelength of the corresponding optical signal of the pattern in the first area is the center wavelength of the optical fingerprint sensor used for fingerprint collection.
  • the wavelength of the optical signal corresponding to the pattern in the first area may be the center wavelength most sensitive to imaging by the optical fingerprint sensor, such as green light, but the embodiment of the present application does not limit this.
  • Embodiment 1 The plurality of predetermined patterns are three sinusoidal stripe patterns with a phase interval of 2 ⁇ / 3.
  • the three sinusoidal stripe patterns respectively correspond to the first optical signal, the second optical signal and the third optical signal.
  • the sin (k 1 x + k 2 sin (y)) function can be used to generate three sinusoidal fringe patterns with light and dark intervals, where k 1 and k 2 can be used to control the The interval between light and dark areas in a sinusoidal stripe pattern.
  • the wavelength of the optical signal corresponding to the area lit by the stripes may be set to the center wavelength of the optical fingerprint sensor, for example, the wavelength of the green band, to improve the fingerprint recognition performance.
  • the three sinusoidal fringe patterns are sequentially displayed in the fingerprint detection area, and based on each sinusoidal fringe pattern, a fingerprint image is collected to obtain three fingerprint images L 1 , L 2, and L 3 , as shown in FIG. 6.
  • L 1 L d ⁇ (0.5 + 0.5 ⁇ sin ( ⁇ )) + L g / 2 (1)
  • L d is the first target image
  • L g is the second target image
  • the L d includes the sum of fingerprint information carried in the optical signal reflected from the surface of the object to be identified when the first optical signal, the second optical signal, and the third optical signal respectively illuminate the object to be identified, or, It can also be considered that L d is an image formed by the optical signal reflected from the surface of the object to be identified when the superimposed optical signal of the first optical signal, the second optical signal, and the third optical signal illuminates the object to be identified.
  • the L g includes the sum of fingerprint information carried in the optical signals reflected from the surface of the object to be recognized when the first optical signal, the second optical signal, and the third optical signal respectively illuminate the object to be identified, or, It can also be considered that the L g is an image formed by the optical signals scattered from the inside of the object to be recognized when the superimposed optical signals of the first optical signal, the second optical signal, and the third optical signal illuminate the object.
  • the fixed phase difference may correspond to the phase interval between the three sinusoidal fringe patterns.
  • the three fingerprint patterns are superimposed to obtain a single-color image.
  • the single-color fingerprint image can be used as the reference fingerprint image in the foregoing embodiments.
  • the coefficient of L g can be determined according to the number of pixels occupied by bright stripes and the number of pixels occupied by dark stripes, if the pixels of bright stripes and dark stripes cycle is 8 pixels, 8 pixels brighter i.e., 8 pixels off, in this case L g L g is 1/2 of the full brightness of all the pixels, or when, if the bright stripes cycle is 8 pixels pixels, dark stripe pixel period is four pixels, i.e., eight pixels lit, off four pixels, in this case L g L g is 2/3, and so on for all pixels at full brightness, the embodiment of the present application
  • the example only takes the same pixel period of the bright and dark stripes as an example for description. In other cases, it is only necessary to adjust the coefficients of L g in formula (1) -formula (3), and for the sake of brevity, they are not described here.
  • first target image L d and the second target image L g can be obtained according to formula (1) -formula (3), as shown in the following formula:
  • the object to be recognized is a fingerprint finger according to the determined first target image L d and second target image L g .
  • the object to be recognized is a fingerprint finger according to the determined first target image L d and second target image L g .
  • Embodiment 2 The plurality of predetermined patterns are three checkerboard patterns with a phase interval of 2 ⁇ / 3.
  • the checkerboard pattern may be a checkerboard pattern in which n pixels are bright and m pixels are dark.
  • the n and m may be the same or different.
  • the n may be 6 to 12, and the m may also be 6 ⁇ 12.
  • the fingerprint information of the bright light area and the fingerprint information of the dark light area in the fingerprint image collected based on each checkerboard pattern can be extracted.
  • the fingerprint information in the bright area of the fingerprint image includes fingerprint information carried by the optical signal corresponding to the predetermined pattern corresponding to the fingerprint image on the surface of the object to be recognized and the optical signal corresponding to the predetermined pattern corresponding to the fingerprint image at Fingerprint information carried by the light signal scattered inside the object to be identified.
  • the extracted fingerprint information L max of the bright light area and the fingerprint information L min of the dark light area have the following relationship with the first target image L d and the second target image L g :
  • the coefficient of L g can be determined according to the number of pixels occupied by bright areas and the number of pixels occupied by dark areas.
  • the formula (6) and formula (7) are in bright light.
  • the pixel period of the area and the dark area is determined when the pixel period is 8, so the coefficient is 1/2. In other cases, the coefficient can be adjusted accordingly, which will not be repeated here.
  • first target image L d and the second target image L g may be solved according to formula (6) and formula (7), and then the to-be-recognized may be determined according to the first target image L d and the second target image L g Whether the object is a real finger can be referred to the related description in the foregoing embodiment for specific implementation.
  • one first target image and one second target image can be determined based on each fingerprint image, that is, multiple first target images and multiple second target images can be extracted.
  • the The extracted multiple first target images are superimposed to obtain a first target image for true and false fingerprint recognition, and the multiple second target images are superimposed to obtain a second target image for true and false fingerprint recognition.
  • each of the fingerprint images collected based on the checkerboard pattern in Embodiment 2 can extract the fingerprint information L max in the bright light region and the fingerprint information L min in the dark light region, so that the formula (6 ) And formula (7) to solve a first target image L d and a second target image L g , that is, the embodiment of the present application can also distinguish true and false fingerprints when the collected fingerprint image is a single bright and dark fingerprint image .
  • Embodiment 3 The plurality of predetermined patterns include a first predetermined pattern and a second predetermined pattern, the first predetermined pattern and the second predetermined pattern are complementary patterns, wherein the first predetermined pattern is a fingerprint ridge pattern bright, fingerprint valley In the pattern where the pattern is off, the second predetermined pattern is a pattern where the fingerprint ridge pattern is off and the fingerprint valley pattern is bright.
  • a fingerprint image based on a solid color spot specifically, control all pixels in the fingerprint detection area to display a solid color spot in the fingerprint detection area, and collect a fingerprint image of an object to be recognized based on the solid color spot; then, in the The fingerprint image is displayed in the fingerprint detection area, wherein the pixels in the area where the fingerprint ridge image in the fingerprint image is located are turned on, the pixels in the area where the fingerprint valley image in the fingerprint image is located are turned off, and the first predetermined pattern is displayed based on the The first predetermined pattern collects the first fingerprint image, and then the pixels in the area where the fingerprint ridge image in the fingerprint image is located are turned off, the pixels in the area of the fingerprint valley image in the fingerprint image are turned on, and the second predetermined pattern is displayed, The second fingerprint image is collected based on the second predetermined pattern, and the first target image and the second target image may be further determined according to the first fingerprint image and the second fingerprint image. Repeat again.
  • the sampling value of each pixel in the optical fingerprint sensor may also be calibrated to reduce the error of subsequent fingerprint collection.
  • a shielding member may be provided above the fingerprint identification device, for example, a shielding member made of black rubber, to prevent interference of fingerprint image collection with external ambient light.
  • the light source is controlled to emit light signals of different intensities to the fingerprint detection area, for example, 100%, 70%, and 40%.
  • the light source is controlled to emit light signals of different intensities to the fingerprint detection area, for example, 100%, 70%, and 40%.
  • multiple fingerprint images are collected, and further according to the multiple fingerprint images, the The sampling value of each photosensitive unit in the optical fingerprint sensor is calibrated (for example, KB calibration) to obtain the calibration value of each photosensitive unit (for example, K and B), and the calibration value can be used for Calibrate the sampled value of the photosensitive unit to reduce the measurement error caused by the hardware difference of the optical fingerprint sensor.
  • an embodiment of the present application also provides an electronic device 800.
  • the electronic device 800 may include a display screen 820 and the above-mentioned fingerprint recognition device 810.
  • the fingerprint recognition device 810 may be the fingerprint recognition in the foregoing embodiment
  • the device 300 is provided below the display screen 820.
  • 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 fingerprint detection by the fingerprint identification device 810.
  • the fingerprint identification device 810 may be used to execute the content in the method embodiment shown in FIG. 5.
  • the disclosed system and device may be implemented in other ways.
  • the device embodiments described above are only schematic.
  • the division of the units is only a division of logical functions.
  • there may be other divisions for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented.
  • the displayed or discussed mutual couplings or direct couplings or communication connections may be indirect couplings or communication connections through some interfaces, devices, or units, and may also be electrical, mechanical, or other forms of connection.
  • 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 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 of the present application.
  • the functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
  • the above integrated unit may be implemented in the form of hardware or software functional unit.
  • the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium.
  • the technical solution of the present application essentially or part of the contribution to the existing technology, or all or part of the technical solution can be embodied in the form of a software product
  • the computer software product is stored in a storage medium
  • several instructions are included to enable a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program code .

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Abstract

L'invention concerne un procédé, un appareil et un dispositif électronique pour identification d'empreintes digitales, permettant d'améliorer la sécurité de l'identification d'empreintes digitales. Le procédé comprend les étapes consistant à : collecter au moins une image d'empreinte digitale d'un objet à identifier lorsque l'objet à identifier presse au moins un motif prédéterminé dans une zone de détection d'empreinte digitale d'un écran d'affichage, chaque image d'empreinte digitale correspondant à un motif prédéterminé, et l'intensité d'un signal optique correspondant à une première zone dans le motif prédéterminé étant supérieure à l'intensité d'un signal optique correspondant à une seconde zone dans le motif prédéterminé (510) ; déterminer une première image cible et/ou une seconde image cible selon l'au moins une image d'empreinte digitale, la première image cible comprenant une image formée par un signal optique qui est réfléchi à une surface de l'objet à identifier par le signal optique correspondant à l'au moins un motif prédéterminé, et la seconde image cible comprenant une image formée par un signal optique diffusé à l'intérieur de l'objet à identifier par le signal optique correspondant à l'au moins un motif prédéterminé (520) ; et déterminer, selon la première image cible et/ou la seconde image cible, si l'objet à identifier est un doigt réel (530).
PCT/CN2018/116234 2018-11-19 2018-11-19 Procédé, appareil et dispositif électronique pour identification d'empreintes digitales WO2020102945A1 (fr)

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