Volume holographic wavelet correlation processor

被引：19

作者：

Feng, WY ^{[1
]}

Yan, YB ^{[1
]}

Jin, GF ^{[1
]}

Wu, MX ^{[1
]}

He, QS ^{[1
]}

机构：

[1] Tsing Hua Univ, Dept Precis Instruments, State Key Lab Precis Measurement Technol & Instru, Beijing 100084, Peoples R China

来源：

OPTICAL ENGINEERING | 2000年 / 39卷 / 09期

关键词：

volume holographic storage; wavelet transform; correlation identification;

D O I：

10.1117/1.1287393

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A volume holographic wavelet correlation processor is proposed and constructed for correlation identification. It is based on the theory of wavelet transforms and the mechanism of angle-multiplexing volume holographic associative storage in a photorefractive crystal. High parallelism and discrimination are achieved with the system. Our research shows that cross-talk noise is significantly reduced with wavelet filtering preprocessing. Correlation cutouts can be expanded from one dimension in a conventional system to two dimensions in our system. As a result, the parallelism is greatly enhanced. Furthermore, several advantages of wavelet transforms in improving the discrimination capability of the system are described. The conventional correlation between two images is replaced by wavelet correlation between main local features extracted by an appropriate wavelet filter, which provides a sharp peak with low sidelobes. Theoretical analysis and experimental results are both given to support our conclusions. its preliminary application to human-face recognition is studied, (C) 2000 Society of Photo-Optical Instrumentation Engineers. [S0091-3286(00)01409-4].

引用

页码：2444 / 2450

页数：7

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