Biometric optical antispoofing
AssigneeFingerprint Cards Anacatum IP AB
InventorPetter Östlund
Life of this patent
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Abstract
A biometric imaging arrangement comprising: a photodetector pixel array including at least a first portion of pixels arranged to receive light transmitted from a spectral filter with a spectral transmission band and at least a second portion of pixels arranged to receive light not transmitted from the spectral filter, wherein the biometric imaging arrangement is configured to acquire an image of an object and perform user authentication at least partly based on, in the acquired image, a relationship between the intensity of light received by the first portion of pixels and the intensity of light received by the second portion of pixels.
Claims24
A biometric imaging arrangement comprising:
- a photodetector pixel array including at least a first portion of pixels arranged to receive light transmitted from an infrared cut-off filter with a spectral transmission band including the entire range of visible light and at least a second portion of pixels arranged to receive light transmitted through at least one opening in the infrared cut-off filter, the light received by the second portion of pixels including visible light,
- wherein the biometric imaging arrangement is configured to acquire more than one image of an object during illumination of the object with visible light, perform user authentication at least partly based on, in the acquired images, an outcome of a time evolution of a comparison between an intensity of visible light received by the first portion of pixels and an intensity of visible light received by the second portion of pixels in the acquired images, and conclude whether the object in the images is a spoof biometric object or a live biometric object based on the time evolution of the comparison.
A method for authenticating a user of an electronic device including a biometric imaging arrangement having a photodetector pixel array including at least a first portion of pixels arranged to receive light transmitted from an infrared cut-off filter with a spectral transmission band including the entire range of visible light and at least a second portion of pixels arranged to receive light transmitted from through at least one opening in the infrared cut-off filter, the light received by the second portion of pixels including visible light, the method comprising:
- acquiring, using the biometric imaging arrangement, more than one image of an object during illumination of the object with visible light,
- performing user authentication at least partly based on a time evolution of a comparison between an intensity of visible light received by the first portion of pixels and an intensity of visible light received by the second portion of pixels in the acquired images, and
- concluding whether an object in the images is a spoof biometric object or a live biometric object based on an outcome of the comparison.
A computer program product comprising a non-transitory computer readable medium having stored thereon a computer program for authenticating a user of an electronic device including a biometric imaging arrangement having a photodetector pixel array including at least a first portion of pixels arranged to receive light transmitted from an infrared cut-off filter with a spectral transmission band including the entire range of visible light and at least a second portion of pixels arranged to receive light transmitted through at least one opening in the infrared cut-off filter, the light received by the second portion of pixels including visible light, wherein the computer program product comprises:
- code for analyzing a time evolution of a comparison between an intensity of visible light received by the first portion of pixels and an intensity of visible light received by the second portion of pixels, in more than one image of an object acquired by the biometric imaging arrangement during illumination of the object with visible light, and
- code for performing user authentication at least partly based on an outcome of the time evolution of the comparison.
Dependencies are inferred from the claim text.