Patent ID: 11893100
Assignee: FINGERPRINT CARDS ANACATUM IP AB
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G

Claim 13:
14. 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 color controllable light source comprising light source units, wherein the photodetector pixel array comprises a first set of pixels to acquire one or more first image portions of a first type pixels of the first set of pixels being arranged directly under a light source unit of the color 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 one or more second image portions of a second type, pixels of the second set of pixels being arranged directly under a portion of the color 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 color controllable light source;
acquire an image of the object, the image comprising the one or more first image portions of the first type and the one or more second image portions of the second type corresponding to the portions of different light intensity of the light pattern illuminating the object;
identify the one or more first image portions in the acquired image and extract first metrics from the one or more first image portions;
identify the one or more second image portions in the acquired image and extract second metrics from the one or more second image portions; and
perform biometric authentication including spoof detection based on the first metrics and the second metrics.