Method for controlling the shift invariance of optical correlators

被引：27

作者：

Levene, M ^{[1
]}

Steckman, GJ ^{[1
]}

Psaltis, D ^{[1
]}

机构：

[1] CALTECH, Dept Elect Engn, Pasadena, CA 91125 USA

来源：

APPLIED OPTICS | 1999年 / 38卷 / 02期

关键词：

Cameras - Charge coupled devices - Fourier optics - Holograms - Holographic optical elements - Light modulators - Lithium niobate - Monte Carlo methods - Optical correlation - Phase shift - Refractive index;

D O I：

10.1364/AO.38.000394

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Holographic correlators can implement many correlations in parallel. For most systems shift invariance limits the number of correlation templates that can be stored in one correlator. This is because the output plane must be divided among the individual templates in the system. When the system is completely shift invariant, the correlation peak from one correlator can shift into an area that has been reserved for a different template; in this case a shifted version of one object might be mistaken for a well-centered version of a different object. We describe a technique for controlling the shift invariance of a correlator system by moving the holographic material away from the Fourier plane. (C) 1999 Optical Society of America.

引用

页码：394 / 398

页数：5