A cascaded iterative Fourier transform algorithm for optical security applications

被引：51

作者：

Situ, GH ^{[1
]}

Zhang, JJ ^{[1
]}

机构：

[1] Chinese Acad Sci, Grad Sch, Dept Phys, Beijing 100039, Peoples R China

来源：

OPTIK | 2003年 / 114卷 / 10期

基金：

中国国家自然科学基金;

关键词：

optical security; optical encryption; cascaded iterative Fourier transform algorithm;

D O I：

10.1078/0030-4026-00291

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A cascaded iterative Fourier transform (CIFT) algorithm is presented for optical security applications. Two phase-masks are designed and located in the input and the Fourier domains of a 4-f correlator respectively, in order to implement the optical encryption or authenticity verification. Compared with previous methods, the propose algorithm employs an improved searching strategy: modifying the phase-distributions of both masks synchronously as well as enlarging the searching space. Computer simulations show that the algorithm results in much faster convergence and better image quality for the recovered image. Each of these masks is assigned to different person. Therefore, the decrypted image can be obtained only when all these masks are under authorization. This key-assignment strategy may reduce the risk of being intruded.

引用

页码：473 / 477

页数：5

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