为了压抑相干噪声,本文采用单色非相干线光源进行图像微分。微分滤波器是利用光栅结构的微分函数制作其傅里叶变换全息滤波器来实现的。实验结果表明,利用非相干光进行图像微分大大提高了输出图像的信噪比。

In order to suppress the coherent artigact noise, a method of image differentiation by means of monochromatic incoherent line source is described. Differentiation filter is realized by making F. T. holographic filter from diffracting grating type differentiation mask. Experimental results show that noise reduction resulting from the line source is considerable.