MULTISPECTRAL EYE ANALYSIS FOR IDENTITY AUTHENTICATION
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Abstract
Certain aspects relate to systems and techniques for generating high resolution iris templates and for detecting spoofs, enabling more reliable and secure iris authentication. Pairs of RGB and NIR images can be captured by the iris authentication system for use in iris authentication, for example using an NIR LED flash and a four-channel image sensor. Multiple images of the user'"'"'s iris can be captured by the system in a relatively short period of time and can be fused together to generate a high resolution iris image that can contain more detail of the iris structure and unique pattern than each individual images. The “liveness” of the iris, referring to whether the iris is a real human iris or an iris imitation, can be assessed via a liveness ratio based on comparison of known iris and sclera reflectance properties at various wavelengths to determined sensor responses at those same wavelengths.
78 Citations
60 Claims
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1-30. -30. (canceled)
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31. A system for multispectral iris authentication comprising:
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at least one image sensor configured for capture of image data including both RGB information and near-infrared (NIR) information, the image data depicting an eye and iris of a user; and a processor configured to execute instructions for; tracking the eye and iris of the user across a plurality of image frames of the image data; fusing the plurality of image frames into a fused NIR image based on the NIR information and a fused RGB image based on the RGB information, each of the fused NIR image and the fused RGB image having more information representing the iris than any one of the plurality of image frames; performing liveness detection by determining a liveness score based at least partly on intensity values in an iris pixel patch and a sclera pixel patch in each of the fused NIR image and the fused RGB image, and comparing the liveness score to an expected liveness score based at least partly on known reflectance properties of the human iris and sclera; performing iris verification by comparing a current iris template to a stored iris template, the current iris template generated based at least partly on the information representing the iris of the fused NIR image; and authenticating the user based at least partly on the iris verification. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. A computer-implemented method for multispectral iris authentication comprising:
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receiving image data of an eye and iris of a user, the image data including both RGB information and near-infrared (NIR) information; tracking the eye and iris of the user across a plurality of image frames of the image data; fusing the plurality of image frames into at least a fused NIR image based on the NIR information, the fused NIR image having more information representing the iris than any one of the plurality of image frames; determining a liveness score based at least partly on intensity values in an iris pixel patch and a sclera pixel patch in each of the fused NIR image and an RGB image generated based on the RGB information; performing liveness detection by comparing the liveness score to an expected liveness score based at least partly on known reflectance properties of the human iris and sclera; and authenticating the user based at least partly on a result of the liveness detection and at least partly on the information representing the iris of the fused NIR image. - View Dependent Claims (44, 45, 46, 47, 48, 49)
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50. An imaging device for capture of RGB image data and near-infrared (NIR) image data, the device comprising:
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an NIR light source for illuminating a target image scene; a color filter array including a repeating pattern of color filter elements, the repeating pattern of color filter elements having four bands aligned to allow passage of light including four wavelength ranges each corresponding to one of four channels, the four bands including a first band aligned to allow passage of a range of red light wavelengths and a second band aligned to allow passage of a range of NIR light wavelengths emitted by the NIR light source; at least one image sensor configured for capturing four-channel image data of the target image scene illuminated by the light at the four wavelength ranges, the four-channel image data including a red channel representing the passed range of red light wavelengths and an NIR channel representing the passed range of NIR light wavelengths; and a memory storing instructions for capture of the four-channel image data; and a processor coupled to the memory configured to execute the instructions to cause capture of an RGB component of the four-channel image data using a first exposure time, the RGB channel including the red channel, and to cause capture of the NIR channel of the four-channel image data using an adaptive exposure time, the adaptive exposure time selected to generate an NIR image with at least a threshold level of resolution usable for iris verification. - View Dependent Claims (51, 52, 53, 54, 55, 56)
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57. An imaging apparatus for capture of four-channel image data, the apparatus comprising:
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means for providing near-infrared (NIR) illumination to a target image scene; means for capture of image data of the target image scene illuminated by four different ranges of light wavelengths each corresponding to one of four channels in the image data, an NIR channel of the four channels representing light received in an NIR range of the four different ranges of light wavelengths provided by the means for providing NIR illumination, a red channel of the four channels including a visible red range of the four different ranges of light wavelengths; means for storing instructions for capture of the image data; means for implementing the instructions to cause capture of a first subset of the four channels including the red channel of the image data using a first exposure time; and means for implementing the instructions to cause capture of a second subset of the four channels including the NIR channel of the image data using an adaptive exposure time. - View Dependent Claims (58, 59, 60)
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Specification