optical image subtraction
optical image subtraction
光学图像减法
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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。
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