移相干涉术中有分割遮拦干涉图的相位展开

Phase Unwrapping of Interferogram with Obscurations in Phase-Shifting Interferometry

在质量图导引路径积分法的基础上,提出了一种适用于移相干涉术中有分割遮拦干涉图的相位展开方法,可以有效地解决不同有效区域之间相位展丌结果不连续的问题。首先,采用图像修复方法,根据有效区域中包裹相位的纹理特征对遮拦区域进行填充,使被遮拦分割的各个有效区域连通,相位展开路径可以通过各个有效区域。在此基础上,提出了一种新的质量图,导引相位展开沿着相位变化最小的路径穿过各个有效区域之间的填充区域,以保证不同有效区域中属于同一干涉级次的包裹相位主值加减2π的倍数相同。研究结果表明,这种方法能有效地防止相位展开结果中2π整数倍的全局误差,使不同有效区域相位展开结果连续。

A new phase unwrapping method based on qualitymap-guided path-integralmethod is presented to deal with the discontinuous unwrapping result of the interferogram with obscurations in phase-shifting interferometry. First, the obscured regions are filled according to the texture feature of wrapped phase data in adjacent valid regions by image repair. The valid regions are connected together in this way and thus path-integral phase unwrapping can be conducted through different valid regions. To ensure the same addition or subtraction of integral multiple of 2πbetween wrapped phase in the same fringe order but different valid regions, a path-integral phase unwrapping method based on a new quality map is proposed. The new quality map can lead the integral path to follow the minimum phase variation direction through the filled regions. The unwrapping result shows that, the presented method is effective to avoid the global error of integral multiple of 2π between different valid regions in phase unwrapping of interferogram with obscurations in phase-shifting interferometry.