Horwitz B A
Appl Opt. 1978 Jan 15;17(2):181-6. doi: 10.1364/AO.17.000181.
A heuristic development of the operation of a square root filter (one whose amplitude transmittance is proportional to the square root of position in frequency space) is presented. The output of a coherent optical processor utilizing this filter for phase image inputs is shown to be an intensity which is directly proportional to the derivative of the input phase function. The results of a digital filtering experiment which confirms this linear relationship are presented. The use of this filter in phase image visualization systems is also discussed.
本文介绍了平方根滤波器（其振幅透过率与频率空间中位置的平方根成正比）操作的启发式发展。利用该滤波器处理相位图像输入的相干光学处理器的输出显示为一种强度，它与输入相位函数的导数成正比。文中给出了证实这种线性关系的数字滤波实验结果。还讨论了该滤波器在相位图像可视化系统中的应用。
