光学图象减法及其差异的假彩色显示

The Optical Image Subtraction and Pseudo-colour Displaying of Image Difference

本文提出一种可直接对差异进行假彩色显示的光学图象相减方法。从原理上推导了利用不等距的二元光栅编码和用矩孔解码,可在衍射的+1级和+2级输出分别得到图象之和与差的信息,若让1、2级不同的色光通过,则可在输出差值图象的同时直接对差异进行假彩色显示。文中给出的实验结果与理论相符合。

This article describes a method of direct pseudo-colour displaying of ima-ge difference.It has been shown that the sum and difference of image information canbe obtained separately in diffraction order+1 and+2.Coding is made by a binarygrating with its width of black line unequal to the white one.Decoding is made thro-ugh rectangular filtered.If the different light colour in the diffraction order+1 and+2 is filtered,the image difference is obtained with the presence of direct pseudoco-lour enhancement of the difference simultaneously.