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公开(公告)号：US20170053406A1
公开(公告)日：2017-02-23
申请号：US15137350
申请日：2016-04-25
Applicant: EyeVerify Inc.
Inventor： David Hirvonen
CPC classification number: H04N5/2256 , G06K9/00221 , G06K9/00906 , G06K9/56 , G06T7/32 , G06T7/70 , G06T7/90 , G06T2207/20024 , G06T2207/30196 , H04L63/0861 , H04N5/23293
Abstract: In a system for determining liveness of an image presented for authentication, a reference signal is rendered on a display, and a reflection of the rendered signal from a target is analyzed to determine liveness thereof. The analysis includes spatially and/or temporally band pass filtering the reflected signal, and determining RGB values for each frame in the reflected signal and/or each pixel in one or more frames of the reflected signal. Frame level and/or pixel-by-pixel correlations between the determined RGB values and the rendered signal are computed, and a determination of whether an image presented is live or fake is made using either or both correlations.
Abstract translation: 在用于确定呈现用于认证的图像的活动性的系统中，在显示器上呈现参考信号，并且分析来自目标的渲染信号的反射以确定其活跃性。 分析包括对反射信号进行空间和/或时间带通滤波，并且在反射信号的一个或多个帧中确定反射信号和/或每个像素中的每个帧的RGB值。 计算所确定的RGB值和渲染信号之间的帧级和/或逐像素相关性，并且使用两者之一或两者相关来确定呈现的图像是活的还是假的。
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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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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：US10237459B2
公开(公告)日：2019-03-19
申请号：US15137350
申请日：2016-04-25
Applicant: EyeVerify Inc.
Inventor： David Hirvonen
Abstract: In a system for determining liveness of an image presented for authentication, a reference signal is rendered on a display, and a reflection of the rendered signal from a target is analyzed to determine liveness thereof. The analysis includes spatially and/or temporally band pass filtering the reflected signal, and determining RGB values for each frame in the reflected signal and/or each pixel in one or more frames of the reflected signal. Frame level and/or pixel-by-pixel correlations between the determined RGB values and the rendered signal are computed, and a determination of whether an image presented is live or fake is made using either or both correlations.
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公开(公告)号：US09396537B2
公开(公告)日：2016-07-19
申请号：US14480802
申请日：2014-09-09
Applicant: EyeVerify, Inc.
Inventor： David Hirvonen
CPC classification number: G06T7/0026 , G06K9/00221 , G06K9/00906 , G06K9/56 , G06T7/32 , G06T7/70 , G06T7/90 , G06T2207/20024 , G06T2207/30196 , H04L63/0861 , H04N5/2256 , H04N5/23293
Abstract: In a system for determining liveness of an image presented for authentication, a reference signal is rendered on a display, and a reflection of the rendered signal from a target is analyzed to determine liveness thereof. The analysis includes spatially and/or temporally band pass filtering the reflected signal, and determining RGB values for each frame in the reflected signal and/or each pixel in one or more frames of the reflected signal. Frame level and/or pixel-by-pixel correlations between the determined RGB values and the rendered signal are computed, and a determination of whether an image presented is live or fake is made using either or both correlations.
Abstract translation: 在用于确定呈现用于认证的图像的活动性的系统中，在显示器上呈现参考信号，并且分析来自目标的渲染信号的反射以确定其活跃性。 分析包括对反射信号进行空间和/或时间带通滤波，并且在反射信号的一个或多个帧中确定反射信号和/或每个像素中的每个帧的RGB值。 计算所确定的RGB值和渲染信号之间的帧级和/或逐像素相关性，并且使用两者之一或两者相关来确定呈现的图像是活的还是假的。
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公开(公告)号：US20160071275A1
公开(公告)日：2016-03-10
申请号：US14480802
申请日：2014-09-09
Applicant: EyeVerify, Inc.
Inventor： David Hirvonen
CPC classification number: G06T7/0026 , G06K9/00221 , G06K9/00906 , G06K9/56 , G06T7/32 , G06T7/70 , G06T7/90 , G06T2207/20024 , G06T2207/30196 , H04L63/0861 , H04N5/2256 , H04N5/23293
Abstract: In a system for determining liveness of an image presented for authentication, a reference signal is rendered on a display, and a reflection of the rendered signal from a target is analyzed to determine liveness thereof. The analysis includes spatially and/or temporally band pass filtering the reflected signal, and determining RGB values for each frame in the reflected signal and/or each pixel in one or more frames of the reflected signal. Frame level and/or pixel-by-pixel correlations between the determined RGB values and the rendered signal are computed, and a determination of whether an image presented is live or fake is made using either or both correlations.
Abstract translation: 在用于确定呈现用于认证的图像的活动性的系统中，在显示器上呈现参考信号，并且分析来自目标的渲染信号的反射以确定其活跃性。 分析包括对反射信号进行空间和/或时间带通滤波，并且在反射信号的一个或多个帧中确定反射信号和/或每个像素中的每个帧的RGB值。 计算所确定的RGB值和渲染信号之间的帧级和/或逐像素相关性，并且使用两者之一或两者相关来确定呈现的图像是活的还是假的。
