利用光栅作为滤波器，在相干光处理系统中可对字符进行相加和相减。
The addition and subtraction of characters can be performed in a coherent optical processing system if a grating is used as a filter.
利用余弦型的复合光栅作为滤波器，在相干光处理系统中可对图像进行微商。
Pattern differentiation can be performed in a coherent Optical processing system if a composite sinusoidal grating is used as a filter.
基于以非相干光相关器为核心的光电混合图像处理系统，实现了基于光学沃尔什变换特征提取的图像匹配算法。
Based on a hybrid opto electrical image processing system with an incoherent correlator, the image matching algorithm using optical Walsh transformation is realized successfully.
置一位相光栅于相干光学处理系统频谱平面，利用其零级与一级衍射光的相干迭加实现图象相减。
With a phase grating located at Fourier frequency plane, optical image subtraction is obtained as a result of the coherent superposition of the zeroth and the first order of the diffracted light.
置一位相光栅于相干光学处理系统频谱平面，利用其零级与一级衍射光的相干迭加实现图象相减。
With a phase grating located at Fourier frequency plane, optical image subtraction is obtained as a result of the coherent superposition of the zeroth and the first order of the diffracted light.
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