提出一种非线性自适应数字滤波器对通过移相干涉术得到的原理相位图进行去噪音处理.这种数字滤波器的窗口尺寸可以根据其在相位图中的不同位置而变化.在有噪音(尤其是靠近2π相位跳变处的噪音)存在的情况下,相位连续化过程仍可以有效地进行以重建被测物体表面形貌的真实相位图.详细介绍了这一技术的原理及实验结果.

An adaptive filter for preprocessing wrapped phase image with high noise content has been developed. The window size of this median filter is adjustable according to its location in the noisy phase image. Phase unwrapping can then be done to recover the real phase image without the hampering influence of noise, especially the noise near the phase jumps. Both numerical simulation and experimental results used to examine the effectiveness of this adaptive filter are presented.