Methods and systems for performing biometric functions
First Claim
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1. A method of executing a biometric function, the method comprising:
- generating illumination light;
directing the illumination light to an optically distinct portion of a deformable layer while the deformable layer is in a state of deformation resulting from application of pressure to the deformable layer by a skin site;
receiving light scattered from the optically distinct portion of the deformable layer;
generating a displacement map from the received light, the displacement map corresponding to displacements at points of the optically distinct portion of an interface between the deformable layer and the skin site;
determining a fingerprint pattern of the skin site from the displacement map; and
performing the biometric function with the determined fingerprint pattern.
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Abstract
Methods and sensors are disclosed for executing a biometric function. Illumination light is generated and directed to a deformable layer when the deformable layer is in a state of deformation resulting from pressure applied to the deformable layer by a skin site. Light scattered from the deformable layer is received. A fingerprint pattern of the skin site is determined from the received light. The biometric function is performed with the determined fingerprint pattern.
8 Citations
35 Claims
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1. A method of executing a biometric function, the method comprising:
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generating illumination light; directing the illumination light to an optically distinct portion of a deformable layer while the deformable layer is in a state of deformation resulting from application of pressure to the deformable layer by a skin site; receiving light scattered from the optically distinct portion of the deformable layer; generating a displacement map from the received light, the displacement map corresponding to displacements at points of the optically distinct portion of an interface between the deformable layer and the skin site; determining a fingerprint pattern of the skin site from the displacement map; and performing the biometric function with the determined fingerprint pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A biometric sensor for executing a biometric function, the biometric sensor comprising:
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an illumination subsystem; a detection subsystem; a deformable platen adapted to receive placement of a skin site; and a computational unit interfaced with the illumination subsystem and with the detection subsystem, wherein; the deformable platen comprises a deformable layer; the illumination subsystem comprises; an illumination source; and illumination-subsystem optics to direct light from the illumination source to the deformable layer; the detection subsystem comprises; a camera; and detection-subsystem optics to direct light scattered from the deformable layer to the camera; and the computational unit having computer-readable storage including the following instructions and a processor to perform the following; instructions to operate the illumination subsystem to direct light from the illumination source to an optically distinct portion of the deformable layer while the deformable layer is in a state of deformation resulting from application of pressure to the deformable layer by the skin site; instructions to operate the detection subsystem to receive light scattered from the optically distinct portion of the deformable layer with the camera; instructions to generate a displacement map from the received light, the displacement map corresponding to displacements at points of the optically distinct portion of an interface between the deformable layer and the skin site; instructions to determine a fingerprint pattern of the skin site from the displacement map; and instructions to perform the biometric function with the determined fingerprint pattern.
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27. A method of executing a biometric function, the method comprising:
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generating illumination light; directing the illumination light to a skin site, a least a portion of the skin site being covered by layer substantially conformal with a topography of the skin site; receiving light scattered from the layer; determining a fingerprint pattern from spatial analysis of the layer based on the received light; and performing the biometric function with the determined fingerprint pattern. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35)
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Specification