介绍一种利用光栅编码实现实时光学图像相减的新方法。仅使用一块一维透反光栅就可完成对待相减的两幅图像进行编码,再通过傅里叶滤波进行解码,即可实时完成光学图像的复振幅相减。文中给出了原理分析及其实验结果,最后作了简要的讨论。

This paper introduces a new method of real-time optical image subtraction realizedby grating encoding. In this method, two images are encoded by a one dimensional transmission-reflection grating, while decoding is completed by Fourier filtering. Thus, amplitude subtraction of the two images will be real-time resulted in the output plane of the optical system. The principle analysis for the method and experimental result are given. Finally, a brief discussion is made.