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公开(公告)号：US06744909B1
公开(公告)日：2004-06-01
申请号：US09377257
申请日：1999-08-19
IPC分类号： F06K900
CPC分类号： G06K9/745 , G06E3/001 , G06K9/748 , G06K19/086
摘要： An authentication system using a correlator that correlates an input with a reference wherein at least one of the input and reference comprises a phase volume mask having structures, preferably points, that are each less than about six microns in size and can have an aspect ratio (AR) greater than 1:1 so as to produce a phase encoded random pattern having millions of combinations in a mask that is as small as one square millimeter. The random pattern can be convolved with a second pattern, such as a biometric pattern, to produce a phase convolved mask. The correlator preferably is a nonlinear joint transform correlator that can use “chirp” encoding to permit the input to be located in a different plane than the reference. The correlator optically Fourier transforms images of the reference and input that are thereafter nonlinearly transformed and inverse Fourier transformed by a processor to determine the presence or absence of a correlation spike indicative of authenticity. A spatial light modulator (SLM) can be used as an input or reference and preferably is a liquid crystal panel having pixels or elements whose phase or grey scale intensity can be selectively controlled by a processor. The SLM can be used to display a biometric pattern, preferably scanned in real time from a person, that is correlated against an input or reference that can comprise a label on a card, a tag, or another object.
摘要翻译： 一种使用将输入与参考相关联的相关器的认证系统，其中所述输入和参考中的至少一个包括相位体积掩模，所述相位体积掩模具有尺寸小于约六微米的结构，优选点，并且可以具有纵横比 AR）大于1：1，以便在小至1平方毫米的掩模中产生具有数百万组合的相位编码随机图案。 随机图案可以与诸如生物特征图案的第二图案进行卷积，以产生相位卷积掩模。 相关器优选地是可以使用“啁啾”编码来允许输入位于与参考的不同平面中的非线性联合变换相关器。 相关器光学傅里叶变换参考和输入的图像，随后由处理器进行非线性变换和傅立叶逆变换，以确定是否存在指示真实性的相关峰值。 空间光调制器（SLM）可以用作输入或参考，并且优选地是具有像素或元件的液晶面板，其相位或灰度强度可以由处理器选择性地控制。 SLM可用于显示优选地从人实时扫描的生物特征图案，其与可包括卡上的标签，标签或另一物体的输入或参考相关联。
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