基于体全息光学相关器的身份认证复合检索方法

体全息相关器具有高速、并行和多通道等特点。基于体全息相关器大幅面、高分辨率、二维数据页结构,将身份认证图文信息进行编码及格式化,组合为适用于光学相关器的图像模板。数据库的图像模板以体全息图的形式存储在铌酸锂晶体中,识别时将待识别的全部或部分身份认证信息输入,光学相关器可快速返回输入图像与所有库图像模板的相关值,从而完成对整个数据库的快速复合检索。介绍了该方法的工作原理、理论模型、编码和组页方法以及复合检索工作流程,给出了演示实验结果。

Identity certification complex retrieval methods based on volume holographic optical correlators

Volume holographic correlators have the advantages of high speed,parallel and multi-channel processing. Based on the large frame,high resolution and two dimensional data page structure,diverse identification certification features of images and text are modulated and formatted as an image plate suitable for the optical correlator. The image plates are stored in the Fe:LiNbO3 crystal as holograms. The optical correlator returns the correlation values between the input image plate and all of the image plates of the whole database when the whole or a part of search key is uploaded,which implements the fast complex retrieval or the content addressing. The principle and modeling,modulation and page composing methods,working process of the complex retrieval are introduced,and the demonstration experiments are presented.