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公开(公告)号:US11126879B1
公开(公告)日:2021-09-21
申请号:US17225797
申请日:2021-04-08
Applicant: EyeVerify, Inc.
Inventor: Spandana Vemulapalli , David Hirvonen
Abstract: Technology described herein includes a method that includes obtaining a set of color-coded sequences, each of which includes a sequence of colors. Each color-coded sequence has auto-correlation properties characterized by a merit factor larger than a first predetermined threshold, and cross-correlation properties among the color-coded sequences characterized by a demerit factor lower than a second predetermined threshold. A color-coded sequence is randomly selected from the set of color-coded sequences. A subject is illuminated in accordance with the sequence of colors in the selected color-coded sequence. A sequence of images of the subject are captured, and are temporally synchronized with illumination by the color-coded sequence. A filtered response image is generated from the sequence of images by a matched filtering process. Based on the filtered response image, it is determined that the subject is an alternative representation of a live person. In response, access to a secure system is prevented.
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公开(公告)号:US11341880B1
公开(公告)日:2022-05-24
申请号:US17230397
申请日:2021-04-14
Applicant: EyeVerify, Inc.
Inventor: Reza R. Derakhshani , Spandana Vemulapalli , Tetyana Anisimova
Abstract: Technology described herein includes a method that includes receiving, at one or more processing devices at one or more locations, one or more image frames; receiving, at the one or more processing devices, one or more signals representing outputs of one or more light sensors of a device; estimating, by the one or more processing devices based on the one or more image frames, one or more illuminance values; determining, by the one or more processing devices, that a degree of correlation between (i) a first illuminance represented by the one or more illuminance values and (ii) a second illuminance represented by the one or more signals fails to satisfy a threshold condition; and in response to determining that the degree of correlation fails to satisfy the threshold condition, determining, by the one or more processing devices, presence of an adverse condition associated with the device.
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公开(公告)号:US20220327321A1
公开(公告)日:2022-10-13
申请号:US17479882
申请日:2021-09-20
Applicant: EyeVerify, Inc.
Inventor: Spandana Vemulapalli , David Hirvonen
Abstract: Technology described herein includes a method that includes obtaining a set of color-coded sequences, each of which includes a sequence of colors. Each color-coded sequence has auto-correlation properties characterized by a merit factor larger than a first predetermined threshold, and cross-correlation properties among the color-coded sequences characterized by a demerit factor lower than a second predetermined threshold. A color-coded sequence is randomly selected from the set of color-coded sequences. A subject is illuminated in accordance with the sequence of colors in the selected color-coded sequence. A sequence of images of the subject are captured, and are temporally synchronized with illumination by the color-coded sequence. A filtered response image is generated from the sequence of images by a matched filtering process. Based on the filtered response image, it is determined that the subject is an alternative representation of a live person. In response, access to a secure system is prevented.
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