Patent ID: 11900715
Assignee: FINGERPRINT CARDS ANACATUM IP AB
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G

Claim 17:
18. An optical biometric imaging arrangement configured to capture an image of an object, the biometric imaging arrangement comprising:
an image sensor comprising a photodetector pixel array, the image sensor being arranged under a controllable light source comprising light source units, wherein the photodetector pixel array comprises a first set of pixels to acquire a first type of image portion, pixels of the first set of pixels being configured to capture light of a first distinguishable color and being arranged directly under a light source unit of the controllable light source that is active during image acquisition to capture predominantly specular light reflected off the object, and a second set of pixels to acquire a second type of image portion, pixels of the second set of pixels being configured to capture light of a second distinguishable color and being arranged directly under a portion of the controllable light source that is at least partly in-active during image acquisition to capture predominantly diffuse light reflected off the object,
the optical biometric imaging arrangement being configured to:
illuminate the object with a light pattern comprising portions of different light intensity using the controllable light source;
acquire an image of the object, the image comprising image portions of the first type and of the second type corresponding to the portions of different light intensity of the light pattern illuminating the object,
perform biometric authentication including spoof detection based on metrics extracted from the image portions of both the first type and the second type.