WO2020077490A1 - Procédé et dispositif de reconnaissance biométrique, et appareil électronique - Google Patents

Procédé et dispositif de reconnaissance biométrique, et appareil électronique Download PDF

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Publication number
WO2020077490A1
WO2020077490A1 PCT/CN2018/110230 CN2018110230W WO2020077490A1 WO 2020077490 A1 WO2020077490 A1 WO 2020077490A1 CN 2018110230 W CN2018110230 W CN 2018110230W WO 2020077490 A1 WO2020077490 A1 WO 2020077490A1
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WIPO (PCT)
Prior art keywords
optical sensor
scanning area
exposure time
scanning
light
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PCT/CN2018/110230
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English (en)
Chinese (zh)
Inventor
青小刚
杨乐
李顺展
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 PCT/CN2018/110230 priority Critical patent/WO2020077490A1/fr
Priority to CN201880002031.7A priority patent/CN109496312B/zh
Publication of WO2020077490A1 publication Critical patent/WO2020077490A1/fr

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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

Definitions

  • the present application relates to the field of biometric identification, and more specifically, to a biometric identification method, device, and electronic device.
  • biometrics technology is gaining more and more attention, and more convenient off-screen biometrics technology, such as liquid crystal display (Liquid Crystal) Display, LCD)
  • liquid crystal display Liquid Crystal
  • LCD liquid crystal display
  • Under-screen optical fingerprint technology uses infrared lamps for supplementary light based on the characteristics of strong infrared light penetration and invisibility.
  • the application scenarios of mobile communication devices are very rich. They will follow users in high temperature, low temperature, outdoor and other scenes, especially in outdoor scenes with strong sunlight. For example, in summer, the intensity can reach 120,000 lux. Sunlight contains a large number of infrared wavelengths. In a scene with strong sunlight, the optical sensor may not work properly due to strong infrared light, which affects the optical fingerprint recognition.
  • the present application provides a biometrics recognition method, device and electronic equipment, which can implement biometrics recognition under strong infrared light scenes based on the under-screen optical fingerprint technology.
  • a biometric identification method including:
  • the light supplementing method of the optical sensor when performing biometric identification is determined.
  • the biometric feature may be a fingerprint.
  • the first exposure time is shorter to achieve the purpose of quickly collecting the first optical signal, thereby improving the user experience.
  • the biometric identification method can be applied to a strong sunlight environment.
  • the biometrics recognition method provided by the embodiments of the present application, it is possible to determine the light supplementing method of the optical sensor when performing biometrics recognition based on the optical signals collected in multiple scanning areas in a short exposure time, so that it can be Based on the optical signal, different fill light modes can be flexibly selected. Furthermore, the problem that the strong infrared light causes the optical sensor to be overexposed and cannot work normally is avoided.
  • the method further includes:
  • the multiple scanning areas are configured, and each of the multiple scanning areas corresponds to multiple pixel points of the optical sensor.
  • the scanning area can be flexibly configured, and at the same time, the optical sensor also supports the fast scanning function.
  • the multiple scanning areas equally divide the photosensitive surface of the optical sensor.
  • the multiple scanning areas are equally divided into the photosensitive surfaces of the optical sensor, it is easier to determine the fill light when the optical sensor performs biometric recognition based on the optical signals collected in the multiple scanning areas, respectively the way.
  • the multiple scanning areas are arranged on the photosensitive surface of the optical sensor in a checkerboard form.
  • the method further includes: configuring the first exposure time.
  • the first exposure time can be flexibly configured, so that the first exposure time can be made short enough to meet the requirement of quickly scanning to acquire the first optical signal.
  • the first threshold is 10 milliseconds.
  • the fill-in light mode includes external strong light-fill light and infrared fill-in light source fill light.
  • the method further includes:
  • the optical sensor When the optical sensor collects the first light signal within the first exposure time, the optical sensor is configured to turn on the exposure and turn off the infrared fill light source.
  • determining the light supplementing method of the optical sensor when performing biometric recognition according to the first light signals collected in the multiple scanning areas includes:
  • the first scanning area is determined according to the first light intensity of each scanning area, and the first scanning area is the brightest scanning area among the plurality of scanning areas at the first light intensity;
  • the light supplementing method of the optical sensor when performing biometric identification is determined.
  • each scanning area corresponds to multiple pixels, and each pixel collects a first optical signal, and the first optical signals collected by multiple pixels are averaged, that is, the first light of each scanning area Strong.
  • the scanning area A corresponds to 25 pixels, and each pixel collects an optical signal X.
  • the 25 optical signals X collected by the 25 pixels are averaged to obtain the light intensity Y of the scanning area A.
  • the method before averaging the first optical signals collected in each of the multiple scanning areas, the method further includes:
  • the first optical signal collected in each scanning area is subjected to dead spot processing.
  • a dead pixel can be understood as a pixel point where the collected first optical signal is abnormal.
  • the processing for removing bad spots is to remove the first light signals collected by some pixel points with abnormal light signal collection in each scanning area, and these mean spots are not considered when taking the average.
  • the scanning area A corresponds to 25 pixels, and each pixel collects an optical signal X. Among them, if the optical signal X collected by pixel 3, pixel 5, and pixel 12 is abnormal, pixels 3 and pixels are excluded. The 22 light signals X collected at the 22 pixel points other than the point 5 and the pixel point 12 are averaged to obtain the light intensity Y of the scanning area A.
  • the pixel 3 when the optical signal X collected by the pixel 3, the pixel 5 and the pixel 12 is significantly different from the optical signal X collected by the surrounding pixels, the pixel 3, the pixel 5 and the pixel 12 can be considered The collected optical signal X is abnormal.
  • the method further includes:
  • the brightest scanning area is newly determined among the scanning areas other than the first scanning area among the plurality of scanning areas.
  • the first scanning area is located at the edge of the photosensitive surface of the optical sensor, it can be determined that the finger is not pressed fully or strong light is incident through the edge. At this time, the brightest scanning area cannot be used to determine the external light Strong (ambient light intensity).
  • the determining the light supplementing method of the optical sensor when performing biometric recognition according to the first light intensity of the first scanning area includes:
  • T represents the second exposure time
  • Vm represents the target light intensity in the linear region
  • Vn represents the first light intensity in the brightest scanning area
  • Dk represents the reference light intensity of the optical sensor
  • the optical sensor uses external strong light for supplementary light when performing biometric recognition, or
  • the optical sensor uses an infrared fill light source for fill light when performing biometric recognition.
  • Vm and Dk are known parameters.
  • the method further includes:
  • the second exposure time is determined as the exposure time of the optical sensor when performing biometric identification.
  • the method further includes:
  • the optical sensor is configured to obtain an optical signal carrying biometric information within the second exposure time using an external strong light supplement.
  • the method further includes:
  • the third exposure time for biometrics recognition by the optical sensor is determined.
  • the method before averaging the second optical signals collected in each scanning area of the plurality of scanning areas, the method further includes:
  • the second optical signal collected in each scanning area is subjected to dead spot processing.
  • the method further includes:
  • the brightest scanning area is newly determined among the scanning areas other than the second scanning area among the plurality of scanning areas.
  • the determining the third exposure time for the optical sensor to perform biometric identification according to the light intensity of the second scanning area includes:
  • T ′ represents the third exposure time
  • Vm represents the target light intensity in the linear region
  • Vn ′ represents the second light intensity in the brightest scanning area
  • Dk represents the reference light intensity of the optical sensor
  • the infrared fill light source works with a DC driving mode, and when performing fill light, the infrared fill light source is driven based on the maximum current.
  • the method further includes:
  • the optical sensor is configured to obtain an optical signal carrying biometric information within the third exposure time by using an infrared fill light source fill light mode.
  • the exposure time of the optical sensor when performing biometrics recognition can also be determined based on the optical signals respectively collected in multiple scanning areas within a short exposure time. Based on the optical signal, the exposure time is accurately determined, and further, the biometrics recognition efficiency is increased.
  • a biometric identification device including:
  • An acquiring unit configured to acquire first optical signals respectively collected by the optical sensor in a plurality of scanning areas within a first exposure time, and the first exposure time is less than a first threshold;
  • the processing unit is configured to determine the light supplementing mode of the optical sensor when performing biometric identification according to the first optical signals collected in the multiple scanning areas.
  • the processing unit is further configured to configure the multiple scanning areas, and each of the multiple scanning areas corresponds to multiple pixel points of the optical sensor.
  • the multiple scanning areas equally divide the photosensitive surface of the optical sensor.
  • the multiple scanning areas are arranged on the photosensitive surface of the optical sensor in a checkerboard form.
  • the processing unit is further configured to configure the first exposure time.
  • the first threshold is 10 milliseconds.
  • the fill-in light mode includes external strong light-fill light and infrared fill-in light source fill light.
  • the processing unit is further configured to configure the optical sensor to turn on the exposure and turn off the infrared fill light source when the optical sensor collects the first light signal within the first exposure time.
  • the processing unit is specifically used to:
  • the first scanning area is determined according to the first light intensity of each scanning area, and the first scanning area is the brightest scanning area among the plurality of scanning areas at the first light intensity;
  • the light supplementing method of the optical sensor when performing biometric identification is determined.
  • the processing unit before averaging the first optical signals collected in each scanning area of the plurality of scanning areas, is further configured to divide the first optical signals collected in each scanning area The optical signal is processed to remove dead pixels.
  • the processing unit is also used to:
  • the brightest scanning area is newly determined among the scanning areas other than the first scanning area among the plurality of scanning areas.
  • the processing unit is specifically used to:
  • T represents the second exposure time
  • Vm represents the target light intensity in the linear region
  • Vn represents the first light intensity in the brightest scanning area
  • Dk represents the reference light intensity of the optical sensor
  • the optical sensor uses external strong light for supplementary light when performing biometric recognition, or
  • the optical sensor uses an infrared fill light source for fill light when performing biometric recognition.
  • the processing unit is further configured to determine the second exposure time as the exposure time of the optical sensor when performing biometric identification.
  • the processing unit is further configured to configure the optical sensor to obtain an optical signal carrying biometric information within the second exposure time by using external strong light supplement.
  • the processing unit is further configured to:
  • the third exposure time for biometrics recognition by the optical sensor is determined.
  • the processing unit before averaging the second optical signals collected in each scanning area of the plurality of scanning areas, the processing unit is further used to collect the second light signals collected in each scanning area The optical signal is processed to remove dead pixels.
  • the processing unit is also used to:
  • the brightest scanning area is newly determined among the scanning areas other than the second scanning area among the plurality of scanning areas.
  • the processing unit is specifically used to:
  • T ′ represents the third exposure time
  • Vm represents the target light intensity in the linear region
  • Vn ′ represents the second light intensity in the brightest scanning area
  • Dk represents the reference light intensity of the optical sensor
  • the infrared fill light source works with a DC driving mode, and when performing fill light, the infrared fill light source is driven based on the maximum current.
  • the processing unit is further configured to configure the optical sensor to use an infrared fill light source fill light mode to acquire an optical signal carrying biometric information within the third exposure time.
  • an electronic device including:
  • Optical sensors used to obtain optical signals
  • An infrared fill light source for infrared fill light to the optical sensor for infrared fill light to the optical sensor
  • the controller includes a memory for storing programs and data and a processor for calling and running the programs and data stored in the memory, and the controller is configured to:
  • a biometric identification device including:
  • Optical sensors used to obtain optical signals carrying biometric information
  • An optical filter is used to filter infrared light except the first wavelength band before the optical sensor acquires an optical signal carrying biometric information.
  • biometric identification device can be applied to a strong sunlight environment.
  • the sensitivity of the optical sensor in the first waveband is greater than the sensitivity of other wavebands.
  • the first band is the 940 nm band.
  • the optical sensor uses an infrared fill light source for fill light.
  • the biometric recognition device is applied to face recognition or fingerprint recognition.
  • a chip includes an input-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. Instructions to perform the method in the first aspect or any possible implementation manner of the first aspect.
  • an electronic device including the chip as in the fifth aspect.
  • a computer storage medium stores program code, and the program code may be used to instruct to execute the method in the first aspect or any possible implementation manner thereof.
  • a computer program product containing instructions which when executed on a computer, causes the computer to execute the method in the first aspect or any possible implementation manner thereof.
  • the biometric recognition solution provided in the embodiments of the present application can determine the light supplement method and exposure of the optical sensor when performing biometric recognition based on the optical signals collected in multiple scanning areas within a short exposure time Time, so that you can flexibly select the fill light method based on the optical signal, and accurately determine the exposure time, thereby avoiding the problem of strong infrared light caused by the optical sensor overexposure and not working properly, and increasing the efficiency of biometric recognition.
  • FIG. 1 is a schematic diagram of an application scenario according to an embodiment of the present application.
  • FIG. 2 is a schematic flowchart of a biometrics recognition method according to an embodiment of the present application.
  • FIG. 3 is a schematic diagram of multiple scanning areas according to an embodiment of the present application.
  • FIG. 4 is a flowchart of biometric recognition according to an embodiment of the present application.
  • FIG. 5 is a schematic block diagram of a biometric identification device according to an embodiment of the present application.
  • FIG. 6 is a schematic block diagram of an electronic device according to an embodiment of the present application.
  • FIG. 7 is a schematic block diagram of another apparatus for biometric identification according to an embodiment of the present application.
  • embodiments of the present application may be applied to fingerprint systems, including but not limited to optical, ultrasonic or other fingerprint recognition systems and medical diagnostic products based on optical, ultrasonic or other fingerprint imaging, and the embodiments of the present application only take optical fingerprint systems as examples The description will be made, but it should not constitute any limitation to the embodiments of the present application.
  • the embodiments of the present application are also applicable to other systems that use optical, ultrasonic, or other imaging technologies.
  • biometric identification in addition to fingerprint identification, the technical solutions of the embodiments of the present application may also perform other biometric identification, such as living body identification, etc., which are not limited in the embodiments 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 collection
  • the device may be specifically an optical fingerprint device, which may be provided in a partial area or all areas below the display screen, thereby forming an under-display optical fingerprint system.
  • the terminal device 100 includes a display screen 120 and an optical fingerprint device 130, where the optical fingerprint device 130 is disposed in a partial area below the display screen 120 .
  • the optical fingerprint device 130 includes a sensing array having a plurality of optical sensing units.
  • the area where the sensing array is located is a fingerprint detection area 103 of the optical fingerprint 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 terminal device or other fingerprint verification, he only needs to press his finger on the The fingerprint detection area 103 of the display screen 120 can realize fingerprint input.
  • the terminal device 100 adopting the above structure does not need a special reserved space on the front to set fingerprint keys (such as the Home key), so a full screen solution can be adopted, that is, the display area of the display screen 120 This basically extends to the entire front of the terminal device 100.
  • the display screen 120 may be a liquid crystal display (Liquid Crystal Display, LCD) or other passive light-emitting display screen.
  • LCD Liquid Crystal Display
  • the display screen 120 may specifically be a touch screen display, which can not only display images, but also detect a user's touch or press operation, thereby providing the user with a human-computer interaction interface.
  • the terminal device 100 may include a touch sensor, and the touch sensor may specifically be a touch panel (Touch Panel, TP), which may be provided on the surface of the display screen 120, or may be partially integrated Or the whole is integrated into the display screen 120 to form the touch display screen.
  • Touch Panel Touch Panel
  • the terminal device 100 further includes a transparent protective cover, which may be a glass cover or a sapphire cover, which is located above the display screen 120 and covers the front of the terminal device 100 .
  • a transparent protective cover which may be a glass cover or a sapphire cover, which is located above the display screen 120 and covers the front of the terminal device 100 .
  • the so-called finger pressing on the display screen 120 actually means 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 includes at least one light detection portion 134 and a plurality of optical components 132, the light detection portion 134 includes the sensing array and is electrically connected to the sensing array
  • the reading circuit and other auxiliary circuits can be fabricated on a chip through a semiconductor process; the optical component 132 can be disposed above the sensing array of the light detecting portion 134, which can specifically include a filter layer (Filter ), A light guide layer and other optical components, the filter layer can be used to filter out ambient light penetrating the finger, and the light guide layer is mainly used to guide the reflected light reflected from the finger surface to the sensing array for optical Detection.
  • the multiple optical components 132 and the at least one light detection portion 134 may be packaged in the same optical fingerprint chip.
  • the light guide layer may be specifically a lens layer made of a semiconductor silicon wafer, which has a plurality of lens units.
  • the terminal device 100 further includes an infrared fill light source 140.
  • the infrared fill light source 140 may be, for example, an infrared lamp for performing infrared fill light when the optical fingerprint device 130 is exposed. It should be understood that the position of the infrared fill light source 140 in FIG. 1 is only an example, and the infrared fill light source 140 may also be located in other positions, which is not limited in the embodiment of the present application.
  • the optical sensor may also be referred to as an image sensor (Sensor) or a photoelectric sensor, which may be fabricated into a chip (DIE) after being processed by a semiconductor process, that is, the DIE includes an image sensor.
  • Sensor image sensor
  • DIE photoelectric sensor
  • optical sensor in the embodiments of the present application may also be referred to as an optical fingerprint device, an optical fingerprint recognition module, a fingerprint device, a fingerprint recognition device, a fingerprint recognition module, a fingerprint module, a fingerprint collection device, and the like.
  • biometric identification solution of the embodiments of the present application is applicable to the use of infrared fill-in optical fingerprint systems, including fingerprint access control, fingerprint punch card machines, off-screen fingerprint mobile phones, face recognition mobile phones, living body recognition mobile phones, computers, automobiles, etc. Under strong light, adjust the fill light mode, fill light intensity and exposure time to adapt to different environments.
  • FIG. 2 is a schematic flowchart of a biometrics recognition method 200 according to an embodiment of the present application. As shown in FIG. 2, the method 200 includes:
  • S220 according to the first optical signals respectively collected in the multiple scanning areas, determine the light supplementing method of the optical sensor when performing biometric identification.
  • the method 200 can be applied to a strong sunlight environment.
  • the method 200 may be performed by an electronic device.
  • the method 200 may be performed by a controller (Host) in the electronic device (for example, a microprogrammed controller (Microprogrammed Control Unit, MCU) )) or a processor (for example, a central processing unit (Central Processing Unit, CPU)), the method 200 may also be executed by a controller or processor to control a specific software
  • the electronic device may include an optical sensor
  • the optical The sensor may correspond to the optical fingerprint device 130 in FIG. 1
  • the method 200 may include a plurality of optical sensors, which may be used to realize fingerprint recognition on a large area.
  • the method 200 is executed by the controller in the electronic device as an example for specific description.
  • the first exposure time is shorter to achieve the purpose of quickly collecting the first optical signal, thereby improving the user experience.
  • an appropriate fill-in light mode is selected so that most areas of the optical sensor work in a linear area, so that biometric information can be correctly collected.
  • the controller may configure the multiple scanning areas, and each of the multiple scanning areas corresponds to multiple pixel points of the optical sensor.
  • the controller can be configured with 5 * 5 scanning areas, and each scanning area corresponds to 10 * 10 pixels.
  • the controller can flexibly configure the scanning area, and at the same time, the optical sensor also supports the fast scanning function.
  • the multiple scanning areas equally divide the photosensitive surface of the optical sensor.
  • the photosensitive surface of the optical sensor may be divided into a plurality of regular scanning areas.
  • the photosensitive surface of the optical sensor is divided into a plurality of circular scanning areas.
  • the photosensitive surface of the optical sensor is equally divided into a plurality of square scanning areas.
  • the multiple scanning areas are arranged on the photosensitive surface of the optical sensor in a checkerboard form.
  • the first optical signal may or may not carry biometric information.
  • the controller may configure the first exposure time.
  • the first exposure time can be flexibly configured, so that the first exposure time can be made short enough to meet the requirement of quickly scanning and acquiring the first optical signal.
  • the first threshold is 10 milliseconds. That is, the first exposure time ⁇ 10 milliseconds.
  • the fill-in light mode includes external strong light fill-in and infrared fill light source fill-in light.
  • the controller when the optical sensor collects the first light signal within the first exposure time, the controller is configured to turn on the optical sensor exposure and turn off the infrared fill light source.
  • controller when the controller is configured to turn on the exposure of the optical sensor and turn off the infrared fill light source, external strong light can fill the optical sensor.
  • the controller may determine the light supplementing method of the optical sensor when performing biometric recognition according to the following manner:
  • the first scanning area is determined according to the first light intensity of each scanning area, and the first scanning area is the brightest scanning area among the plurality of scanning areas at the first light intensity;
  • the light supplementing method of the optical sensor when performing biometric identification is determined.
  • each scanning area corresponds to multiple pixels, and each pixel collects a first optical signal, and the first optical signals collected by multiple pixels are averaged, that is, the first light of each scanning area Strong.
  • the scanning area A corresponds to 25 pixels, and each pixel collects an optical signal X.
  • the 25 optical signals X collected by the 25 pixels are averaged to obtain the light intensity Y of the scanning area A.
  • the controller before averaging the first light signals collected in each scanning area of the plurality of scanning areas, divides the first light signals collected in each scanning area The signal is processed to remove dead pixels.
  • a dead pixel can be understood as a pixel point where the collected first optical signal is abnormal.
  • the processing for removing bad spots is to remove the first light signals collected by some pixel points with abnormal light signal collection in each scanning area, and these mean spots are not considered when taking the average.
  • the scanning area A corresponds to 25 pixels, and each pixel collects an optical signal X. Among them, if the optical signal X collected by pixel 3, pixel 5, and pixel 12 is abnormal, pixels 3 and pixels are excluded. The 22 light signals X collected at the 22 pixel points other than the point 5 and the pixel point 12 are averaged to obtain the light intensity Y of the scanning area A.
  • the pixel 3 when the optical signal X collected by the pixel 3, the pixel 5 and the pixel 12 is significantly different from the optical signal X collected by the surrounding pixels, the pixel 3, the pixel 5 and the pixel 12 can be considered The collected optical signal X is abnormal.
  • the controller restarts in the scanning areas other than the first scanning area among the plurality of scanning areas Determine the brightest scanning area.
  • the first scanning area when a part of the first scanning area that is greater than a certain threshold is located at the edge position of the photosensitive surface of the optical sensor, it can be determined that the first scanning area is located at the edge position of the photosensitive surface of the optical sensor.
  • the first scanning area is located at the edge position of the photosensitive surface of the optical sensor, it can be determined that the finger is not fully pressed or strong light is incident through the edge. At this time, the brightest scanning area cannot be used to determine the external light intensity ( Ambient light intensity).
  • the controller may determine the light supplementing method of the optical sensor when performing biometric recognition according to the following manner:
  • the optical sensor uses external strong light for supplementary light when performing biometric recognition, or
  • the optical sensor uses an infrared fill light source for fill light when performing biometric recognition.
  • T represents the second exposure time
  • Vm represents the target light intensity in the linear region
  • Vn represents the first light intensity in the brightest scanning area
  • Dk represents the reference light intensity of the optical sensor.
  • Vm and Dk are known parameters.
  • the controller determines the second exposure time as the exposure time of the optical sensor when performing biometric recognition.
  • the controller determines the second exposure time as the exposure time when the optical sensor performs biometric recognition.
  • the controller configures the optical sensor to obtain an optical signal carrying biometric information within the second exposure time by using an external strong light supplement.
  • the controller may determine the exposure time when the infrared fill light source is used for fill light as follows:
  • the third exposure time for biometrics recognition by the optical sensor is determined.
  • the controller before averaging the second optical signals collected in each scanning area of the plurality of scanning areas, the controller performs dead pixel processing on the second optical signals collected in each scanning area .
  • the controller restarts in the scanning areas other than the second scanning area among the plurality of scanning areas Determine the brightest scanning area.
  • the second scanning area greater than a certain threshold when a part of the second scanning area greater than a certain threshold is located at the edge position of the photosensitive surface of the optical sensor, it can be determined that the second scanning area is located at the edge position of the photosensitive surface of the optical sensor.
  • the controller may determine the third exposure time for the optical sensor to perform biometric identification according to the following manner:
  • the third exposure time is determined according to Equation 2.
  • T ′ represents the third exposure time
  • Vm represents the target light intensity in the linear region
  • Vn ′ represents the second light intensity in the brightest scanning area
  • Dk represents the reference light intensity of the optical sensor.
  • the infrared fill light source works in a DC driving mode, and when performing fill light, the infrared fill light source is driven based on the maximum current.
  • the controller configures the optical sensor to use an infrared fill light source fill light method to acquire an optical signal carrying biometric information within the third exposure time.
  • the biometrics identification party 300 may include the following steps:
  • the first exposure time is less than a first threshold, for example, the first threshold is 10 milliseconds.
  • S302 Configure a plurality of scanning areas.
  • each of the multiple scanning areas corresponds to multiple pixel points of the optical sensor.
  • the multiple scanning areas equally divide the photosensitive surface of the optical sensor.
  • the multiple scanning areas are arranged on the photosensitive surface of the optical sensor in a checkerboard form.
  • the first optical signals respectively collected by the optical sensor in the multiple scanning areas within the first exposure time are acquired.
  • the optical sensor when acquiring the first light signal, is configured to turn on the exposure and turn off the infrared fill light source.
  • the first scanning area (not shown in FIG. 4) can be determined by the following steps:
  • S3041 Perform a dead spot processing on the first optical signal collected in each scanning area of the multiple scanning areas;
  • S3043 Determine a first scanning area according to the first light intensity of each scanning area, where the first scanning area is the brightest scanning area among the plurality of scanning areas at the first light intensity.
  • the first scanning area is the scanning area with the largest first light intensity among the plurality of scanning areas.
  • the first scanning area is located at the edge position of the photosensitive surface of the optical sensor.
  • the first scanning area when a part of the first scanning area that is greater than a certain threshold is located at the edge position of the photosensitive surface of the optical sensor, it can be determined that the first scanning area is located at the edge position of the photosensitive surface of the optical sensor.
  • S306-S307 is executed, otherwise, S307 is executed.
  • S306 Re-determine the brightest scanning area under the first light intensity.
  • the brightest scanning area is newly determined in the scanning areas other than the first scanning area among the plurality of scanning areas.
  • the second exposure time is determined according to the above formula 1.
  • S308 Determine whether the second exposure time is greater than the second threshold.
  • the optical sensor uses external strong light for supplementary light when performing biometric recognition.
  • the infrared fill light source is used for fill light.
  • the optical sensor uses an infrared fill light source for fill light when performing biometric recognition.
  • the second optical signals respectively collected by the optical sensor in the multiple scanning areas within the first exposure time are acquired.
  • the optical sensor exposure and the infrared fill light source fill light are configured to be turned on.
  • the infrared fill light source works in a DC driving mode, and when performing fill light, the infrared fill light source is driven based on the maximum current.
  • the second scanning area (not shown in FIG. 4) can be determined by the following steps:
  • S3133 Determine a second scanning area according to the second light intensity of each scanning area, where the second scanning area is the brightest scanning area among the plurality of scanning areas at the second light intensity.
  • the second scanning area is the scanning area with the second largest light intensity among the plurality of scanning areas.
  • S314 Determine whether the second scanning area is located at an edge position.
  • the second scanning area is located at the edge position of the photosensitive surface of the optical sensor.
  • the second scanning area greater than a certain threshold when a part of the second scanning area greater than a certain threshold is located at the edge position of the photosensitive surface of the optical sensor, it can be determined that the second scanning area is located at the edge position of the photosensitive surface of the optical sensor.
  • the brightest scanning area is newly determined in the scanning areas other than the second scanning area among the plurality of scanning areas.
  • the third exposure time is the exposure time for the biometric recognition of the optical sensor when the infrared fill light source is used for fill light.
  • the third exposure time is determined according to the above formula 2.
  • S317 Collect an optical signal carrying biometric information.
  • the optical sensor is configured to use an external strong light supplementary light method to acquire an optical signal carrying biometric information within the second exposure time.
  • the optical sensor is configured to obtain an optical signal carrying biometric information within the third exposure time using an infrared fill light source fill light method.
  • the biometrics recognition scheme provided by the embodiments of the present application can determine the fill-in light method and exposure time of the optical sensor when performing biometrics recognition based on the optical signals collected in multiple scanning areas in a short exposure time It can flexibly select the fill light method based on the optical signal and accurately determine the exposure time. In addition, it avoids the problem that the strong infrared light causes the optical sensor to overexposure and cannot work normally, and increases the efficiency of biometric recognition.
  • FIG. 5 is a schematic block diagram of a biometric identification device 400 according to an embodiment of the present application. As shown in FIG. 5, the biometric identification device 400 includes:
  • the obtaining unit 410 is configured to obtain first light signals respectively collected by the optical sensor in a plurality of scanning areas within a first exposure time, and the first exposure time is less than a first threshold;
  • the processing unit 420 is configured to determine, according to the first optical signals respectively collected in the multiple scanning areas, the light supplement mode of the optical sensor when performing biometric identification.
  • the processing unit 420 is further configured to configure the multiple scanning areas, and each scanning area in the multiple scanning areas corresponds to multiple pixel points of the optical sensor.
  • the multiple scanning areas equally divide the photosensitive surface of the optical sensor.
  • the multiple scanning areas are arranged on the photosensitive surface of the optical sensor in a checkerboard form.
  • the processing unit 420 is further configured to configure the first exposure time.
  • the first threshold is 10 milliseconds.
  • the light supplement method includes external strong light supplement light and infrared fill light source light supplement.
  • the processing unit 420 is further configured to configure to turn on the optical sensor exposure and turn off the infrared fill light source when the optical sensor collects the first light signal during the first exposure time.
  • processing unit 420 is specifically used to:
  • the first scanning area is determined according to the first light intensity of each scanning area, and the first scanning area is the brightest scanning area among the plurality of scanning areas at the first light intensity;
  • the light supplementing method of the optical sensor when performing biometric identification is determined.
  • the processing unit 420 is further configured to perform the first optical signals collected in each scanning area Remove dead pixels.
  • processing unit 420 is also used to:
  • the brightest scanning area is newly determined among the scanning areas other than the first scanning area among the plurality of scanning areas.
  • processing unit 420 is specifically used to:
  • T represents the second exposure time
  • Vm represents the target light intensity in the linear region
  • Vn represents the first light intensity in the brightest scanning area
  • Dk represents the reference light intensity of the optical sensor
  • the optical sensor uses external strong light for supplementary light when performing biometric recognition, or
  • the optical sensor uses an infrared fill light source for fill light when performing biometric recognition.
  • the processing unit 320 is further configured to determine the second exposure time as the exposure time of the optical sensor when performing biometric recognition.
  • the processing unit 420 is further configured to configure the optical sensor to obtain an optical signal carrying biometric information within the second exposure time by using external strong light supplement.
  • the processing unit 420 is further used to:
  • a third exposure time for biometrics recognition by the optical sensor is determined.
  • the processing unit 420 is further configured to perform the second optical signals collected in each scanning area Remove dead pixels.
  • processing unit 420 is also used to:
  • the brightest scanning area is newly determined among the scanning areas other than the second scanning area among the plurality of scanning areas.
  • processing unit 420 is specifically used to:
  • T ′ represents the third exposure time
  • Vm represents the target light intensity in the linear region
  • Vn ′ represents the second light intensity in the brightest scanning area
  • Dk represents the reference light intensity of the optical sensor
  • the infrared fill light source works in a DC driving mode, and when performing fill light, the infrared fill light source is driven based on the maximum current.
  • the processing unit 420 is further configured to configure the optical sensor to obtain an optical signal carrying biometric information within the third exposure time by using an infrared fill light source fill light mode.
  • FIG. 6 is a schematic block diagram of an electronic device 500 according to an embodiment of the present application. As shown in FIG. 6, the electronic device 500 includes:
  • the optical sensor 510 is used to obtain an optical signal
  • Infrared fill light source 520 for infrared fill light to the optical sensor
  • the controller 530 includes a memory 531 for storing programs and data and a processor 532 for calling and running the programs and data stored in the memory, and the controller is configured to: execute the above-described FIGS. 2 to 4 The method shown.
  • FIG. 7 is a schematic block diagram of a biometric identification device 600 according to an embodiment of the present application. As shown in FIG. 7, the biometric identification device 600 includes:
  • the optical sensor 610 is used to obtain an optical signal carrying biometric information
  • the optical filter 620 is used to filter infrared light except the first wavelength band before the optical sensor acquires the optical signal carrying biometric information.
  • the sensitivity of the optical sensor in the first waveband is greater than the sensitivity of other wavebands.
  • the first wavelength band is the 940 nm wavelength band.
  • the infrared light intensity at the 940nm band is significantly weaker than the infrared light intensity at the band around the 940nm band (for example, 800nm-1000nm), that is, at the 940nm band, even if the surrounding In a strong sunlight environment, its influence on the infrared compensation of the optical sensor 610 is also weak, and the optical sensor 610 can still work in the linear region.
  • biometrics collection in the 940nm band can achieve the effect of resisting the surrounding strong light.
  • the biometric recognition device is applied to face recognition or fingerprint recognition.
  • the optical sensor uses infrared fill light source for fill light.
  • the biometric identification device 600 can be applied to a strong sunlight environment.
  • the processor in the embodiments of the present application may be an integrated circuit chip, which has signal processing capabilities.
  • each step of the foregoing method embodiment may be completed by an integrated logic circuit of hardware in a processor or instructions in the form of software.
  • the above-mentioned processor may be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), an existing programmable gate array (Field Programmable Gate Array, FPGA), or other available 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 may be implemented or executed.
  • the general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
  • the steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied and executed by a hardware decoding processor, or may be executed and completed by a combination of hardware and software modules in the decoding processor.
  • the software module may be located in a mature storage medium in the art, such as a random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, and register.
  • 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 terminal or the electronic device in the embodiments 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), electronic Erasable 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 static random access memory
  • DRAM dynamic random access memory
  • DRAM synchronous dynamic random access memory
  • SDRAM double data rate synchronous dynamic random access memory
  • Double Data Rate SDRAM DDR SDRAM
  • enhanced SDRAM ESDRAM
  • Synchlink DRAM SLDRAM
  • Direct Rambus RAM Direct Rambus RAM
  • Embodiments of the present application also provide a computer-readable storage medium that stores one or more programs, the one or more programs include instructions, and when the instructions are included in a portable electronic device of multiple application programs When it is executed, the portable electronic device can perform the method of the embodiments shown in FIGS. 2 to 4.
  • An embodiment of the present application also proposes a computer program including instructions.
  • the computer program When the computer program is executed by a computer, the computer can execute the method of the embodiments shown in FIGS. 2 to 4.
  • An embodiment of the present application further provides a chip including 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. 2 to FIG. 4.
  • the disclosed system, device, and method 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 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 may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional 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 are 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 may be stored in a computer-readable storage medium.
  • the technical solution of the present application can essentially be a part that contributes to the existing technology or a 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 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 foregoing storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disks or optical disks and other media that can store program codes .

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  • Engineering & Computer Science (AREA)
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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
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  • Theoretical Computer Science (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
  • Image Input (AREA)

Abstract

L'invention concerne un procédé et un dispositif de reconnaissance biométrique et un appareil électronique permettant de réaliser une reconnaissance biométrique sous forte lumière infrarouge sur la base d'une technologie de capteur d'empreintes digitales dans l'affichage. Le procédé de reconnaissance biométrique comprend les étapes consistant à : acquérir des premiers signaux optiques collectés respectivement à partir de multiples régions de balayage par un capteur optique dans une première durée d'exposition, la première durée d'exposition étant inférieure à un premier seuil (S210) ; et déterminer, en fonction des premiers signaux optiques respectivement collectés à partir des multiples régions de balayage, une approche de supplémentation de lumière devant être utilisée par le capteur optique lors de la réalisation d'une reconnaissance biométrique (S220).
PCT/CN2018/110230 2018-10-15 2018-10-15 Procédé et dispositif de reconnaissance biométrique, et appareil électronique WO2020077490A1 (fr)

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CN201880002031.7A CN109496312B (zh) 2018-10-15 2018-10-15 生物特征识别方法、装置和电子设备

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