光学扫描全息术中的孪生像噪音及消除  

Twin-image Noise and Its Elimination in Optical Scanning Holography

作　　者：孙萍[1] 谢敬辉[1] 蒋玉蓉[1] 周元林[1] 张颖[1] 

机构地区：[1]北京理工大学光电工程系

出　　处：《光子学报》2003年第3期340-343,共4页Acta Photonica Sinica

摘　　要：阐述了光学扫描全息术的基本原理 ,分析了孪生像噪音的来源 ,提出了一种新的数字滤波方法 .计算机仿真结果表明 :孪生像噪音以振荡形式传播 ,降低了重构图像的信噪比 ,影响了重构图像的分辨率 ;用电子复用技术 ,即用复全息图函数代替实全息图函数的方法可以有效地消除孪生像噪音 ;采用单一通道对信号进行处理 ,即只用一个实全息图函数 ,通过数字滤波方法同样可以消除孪生像噪音 ,该方法简便、实用而有效 .The basic principle of optical scanning holography is described and the resource of the twin-image noise is analyzed. A new method of digital filtering is proposed. The computer simulations are performed and some results are obtained. First, the oscillating twin-image noise spoils the resolution and decreases the SNR of the reconstructed image, especially for the complex image. Secondly, the twin-image can be eliminated with the complex hologram by using the electronic multiplexing technique. Finally, the twin-image can be also eliminated with the method of digital filtering. It can be concluded that the method of digital filtering is simple, practical and efficient.

关 键 词：光学扫描全息术 孪生像噪音 图像重构 数字滤波 

分 类 号：O438[机械工程—光学工程]