Search

EP-4113369-B1 - LIVENESS DETECTION MODULE, APPARATUS, SYSTEM AND METHOD

EP4113369B1EP 4113369 B1EP4113369 B1EP 4113369B1EP-4113369-B1

Inventors

  • LIN, SHENG-FU
  • YU, CHIU-LIN
  • HAN, Kai-lun
  • CHANG, JENQ-YANG
  • WU, MAO-JEN

Dates

Publication Date
20260506
Application Date
20210107

Claims (15)

  1. An image capturing system (130), comprising: a main substrate (190); a light source unit (160) electrically connected to the main substrate (190), having a laser unit (168) and a first optical module (165), the laser unit (168) configured to emit light having output power of over 20 mW, the first optical module (165) configured to transmit the emitted light of the light source unit (160) therethrough; an image sensor unit (140) electrically connected to the main substrate (190) near to the light source unit (160), having a second optical module (145) and an image sensor module (142), the second optical module (145) configured to capture images therethrough, the image sensor module (142) configured to generate image signals of the captured images; and a data processing module (180) electrically connected to the main substrate (190) near to the light source unit (160) and the image sensor unit (140), configured to generate liveness detection signals of the generated image signals of the captured images, wherein the laser unit (168) comprises a substrate (161) having a lateral surface (167) and a first inclined surface (164a), a conductive layer (150) formed over the lateral and first inclined surfaces (167, 164a), and a laser source (162), the laser source (162) comprises a single emitter and is electrically connected to the conductive layer (150) formed over the lateral surface (167), and the emitted light of the laser source (162) through the first optical module (165) is reflected light from the conductive layer (150) formed over the first inclined surface (164a), wherein the image signals of the captured images for generating liveness detection signals are generated by adjusting on/off state and timing of the laser source (162) to generate the emitted light, and the first optical module (165) comprises at least one of diffuser or lens configured to transmit the emitted light of the light source unit (160).
  2. The image capturing system (130) of claim 1, wherein the first inclined surface (164a) comprises an internal angle θ from a plane of the lateral surface (167) to the first inclined surface (164a) of between 25° to 75° degrees, inclusive.
  3. The image capturing system (130) of claim 1, wherein the data processing module (180) is configured to generate each liveness detection signal from more than one image signal, in sequence, wherein each sequential image signal comprises a different image signal.
  4. The image capturing system (130) of claim 1, wherein the data processing module (180) is further configured to generate feature recognition data of the generated image signals of the captured images, wherein the data processing module (180) is further configured to generate feature recognition data from more than one image signal, in sequence, wherein each sequential image signal comprises a different image signal.
  5. The image capturing system (130) of claim 1, wherein the laser unit (168) is an edge emitting laser unit having a coherence length of less than 30 centimeters, wherein the image sensor module (142) comprises at least one of a complementary metal oxide semiconductor (CMOS) arrays, charged coupled device (CDD) arrays or photodiode (PD) arrays.
  6. An image capturing device (100), comprising: an image capturing system (130), comprising: a main substrate (190); a light source unit (160) electrically connected to the main substrate (190), having a laser unit (168) and a first optical module (165), the laser unit (168) configured to emit light having output power of over 20 mW, the first optical module (165) configured to transmit the emitted light of the light source unit (160) therethrough; an image sensor unit (140) electrically connected to the main substrate (190) near to the light source unit (160), having a second optical module (145) and an image sensor module (142), the second optical module (145) configured to capture images therethrough, the image sensor module (142) configured to generate image signals of the captured images; and a data processing module (180) electrically connected to the main substrate (190) near to the light source unit (160) and the image sensor unit (140), configured to generate liveness detection signals of the generated image signals of the captured images, wherein the laser unit (168) comprises a substrate (161) having a lateral surface (167) and a first inclined surface (164a), a conductive layer (150) formed over the lateral and first inclined surfaces (167, 164a), and a laser source (162), and a display device (750) coupled to the image capturing system (130), configured to display the captured images of the image sensor unit (140) the laser source (162) comprising a single emitter is electrically connected to the conductive layer (150) formed over the lateral surface (167), and the emitted light of the light source unit (160) through the first optical module (165) is reflected light from the conductive layer (150) formed over the first inclined surface (164a); wherein the image signals of the captured images for generating liveness detection signals are generated by adjusting on/off state and timing of the laser source(162) to generate the emitted light, and the first optical module (165) comprises at least one of diffuser or lens configured to transmit the emitted light of the light source unit (160).
  7. The image capturing device (100) of claim 6, wherein the first inclined surface (164a) comprises an internal angle θ from a plane of the lateral surface (167) to the first inclined surface (164a) of between 25° to 75° degrees, inclusive.
  8. The image capturing device (100) of claim 6, wherein the data processing module (180) is configured to generate each liveness detection signal from more than one image signal, in sequence, wherein each sequential image signal comprises a different image signal.
  9. The image capturing device (100) of claim 6, wherein the data processing module (180) is further configured to generate feature recognition data of the generated image signals of the captured images, wherein the data processing module (180) is configured to generate feature recognition data from more than one image signal, in sequence, wherein each sequential image signal comprises a different image signal.
  10. The image capturing device (100) of claim 6, wherein the laser unit (168) is an edge emitting laser unit having a coherence length of less than 30 centimeters, wherein the image sensor module (142) comprises at least one of a complementary metal oxide semiconductor (CMOS) arrays, charged coupled device (CDD) arrays or photodiode (PD) arrays.
  11. A method for capturing images of an object via an image capturing device (100), comprising: emitting, via a light source unit (160), light having output power of over 20 mW through a first optical path to the object; capturing, via an image sensor unit (140), a plurality of images through a second optical path to an image sensor module (142); indicating, via the image capturing device (100), that the captured images of the image sensor unit (140) is to be generated; generating, via the image sensor module (142) of the image sensor unit (140), image signals of the captured images; processing, via a data processing module (180), the image signals of the captured images and generating liveness detection signals; processing, via the data processing module (180), the liveness detection signals and generating liveness detection data; generating, via the data processing module (180), a liveness score by comparing the liveness detection data against a database; and determining, via the data processing module (180), whether the liveness score is above a liveness threshold, if yes, authenticating a user to use the image capturing device (100) or further processing the image signals, if no, locking the image capturing device (100), wherein a laser unit (168) of the light source unit (160) emits light having output power of over 20 mW through a first optical module (165) and the first optical path to the image, and wherein an image sensor module (142) of the image sensor unit (140) generates image signals of the captured images, and wherein the laser unit (168) comprises a substrate (161) having a lateral surface (167) and a first inclined surface (164a), a conductive layer (150) formed over the lateral and first inclined surfaces (167, 164a), and a laser source (162), the laser source (162) with a single emitter is electrically connected to the conductive layer (150) formed over the lateral surface (167), and the emitted light of the laser source (162) through the first optical module (165) and the first optical path to the object is reflected light from the conductive layer (150) formed over the first inclined surface (164a), wherein the image signals of the captured images for generating liveness detection signals are generated by adjusting on/off state and timing of the laser source (162) to generate the emitted light, and the first optical module (165) comprises at least one of diffuser or lens configured to transmit the emitted light of the light source unit (160).
  12. The method for capturing images of claim 11, wherein the first inclined surface (164a) comprises an internal angle θ from a plane of the lateral surface (167) to the first inclined surface (164a) of between 25° to 75° degrees, inclusive.
  13. The method for capturing images of claim 11, wherein generating liveness detection signals comprises generating each liveness detection signal from more than one image signal, in sequence, wherein each sequential image signal comprises a different image signal.
  14. The method for capturing images of claim 11, wherein further processing the image signals when determining whether the liveness score is above the liveness threshold, if yes, of the method, further comprises: generating, via the data processing module (180), feature recognition data, generating, via the data processing module (180), a matching score by comparing the feature recognition data against the database; comparing, via the data processing module (180), the matching score to a unlock threshold of the image capturing device (100); and determining, via the data processing module (180), whether the matching score is above an unlock threshold, if yes, authenticating the user to use the image capturing device (100), if no, locking the image capturing device (100), wherein, generating feature recognition data comprises generating feature recognition data from more than one image signal, in sequence, wherein each sequential image signal comprises a different image signal.
  15. The method for capturing images of claim 11, wherein the laser unit (168) is an edge emitting laser unit having a coherence length of less than 30 centimeters, wherein the image sensor module (142) comprises at least one of a complementary metal oxide semiconductor (CMOS) arrays, charged coupled device (CDD) arrays or photodiode (PD) arrays.

Description

TECHNICAL FIELD Embodiments described herein relate generally to the field of biometric liveness detection and spoof detection and, more particularly, to liveness detection modules, devices, systems and methods for liveness and spoof detection in images captured by a camera on a device. BACKGROUND Biometrics uses an individual's unique biological identifiers to verify his or her identity. Some advantages of biometric authentication systems include enhanced security and the inability of a biological identifier to be forgotten or lost. However, biometric authentication is susceptible to "presentation attacks" such as spoofing, that attempts to defeat a biometric verification or identification process. The execution of the presentation attack will vary based on the biometric modality; that is, whether the biometric technique uses fingerprints, face, iris, voice, or keystroke biometrics. Some modalities are harder to spoof than others. Furthermore, fraudsters will use different spoofing techniques for each modality. Therefore, the mechanisms required to detect spoofs and other presentation attacks must also be specifically designed for the modality. Liveness detection is useful not only for authentication but also for identity proofing. Biometric authentication involves verification that a user is a systems authorized user. Biometric identity proofing may be performed as part of an onboarding process to verify that the authorized user is in fact a real person. Liveness detection is any technique used to detect a spoof attempt by determining whether the source of a biometric sample is a live human being or a fake representation. This is accomplished through algorithms that analyze data collected from biometric sensors to determine whether the source is live or reproduced. There are two main categories of liveness detection: active and passive. For active liveness detection, authorized users perform an action that cannot be easily replicated with a spoof. It might also incorporate multiple modalities, such as keystroke analysis or speaker recognition. The latter may analyze the movement of a mouth to determine liveness. For passive liveness detection, algorithms are used to detect indicators of a non-live image without user interaction. The capture of high-quality biometric data during registration improves the performance of matching and liveness detection algorithms. Nevertheless, "presentation attacks" such as spoofing continue to be a challenge for biometric authentication. As an example, for the biometric technique using a face of a user, a fraudster may use a "mask" created by a 3D printer for spoofing. As another example, for the biometric technique using a finger of a user, a fraudster may use a fake fingerprint created out of silicone for spoofing. D1 (US2010/067748) discloses methods and systems for performing a biometric measurement on an individual. A purported skin site of the individual is illuminated under a plurality of distinct optical conditions during a single illumination session. Light scattered beneath a surface of the purported skin site is received separately for each of the plurality of distinct optical conditions. A multispectral image of the purported skin site is derived from the received light. A biometric function is performed with the derived multispectral image. D2(EP2752896) discloses a light emitting device package which includes a substrate having a cavity including a side wall and a bottom surface, a light emitting device disposed in the cavity, a support unit including a first region, and a second region bent from the first region and disposed on the side wall of the cavity, and a light-transmitting unit adhered to the first region such that the light-transmitting unit is spaced from the light emitting device, the light-transmitting unit transmitting light emitted from the light emitting device. SUMMARY The invention is defined by the set of appended claims. In an embodiment, an image capturing system, comprising a main substrate, light source unit, image sensor unit and data processing module is provided. The light source unit is electrically connected to the main substrate and has a laser unit and a first optical module. The laser unit is configured to emit light having output power of over 20 mW and the first optical module is configured to transmit the emitted light of the light source unit therethrough. The image sensor unit is electrically connected to the main substrate near to the light source unit and has a second optical module and an image sensor module. The second optical module is configured to capture images therethrough. The image sensor module is configured to generate image signals of the captured images. The data processing module is electrically connected to the main substrate near to the light source and image sensor units and configured to generate liveness detection signals of the generated image signals of the captured images. The laser unit comprises a