二维相位展开方法是近年来较为活跃、引起关注的一个研究课题,它在许多测量应用中有着重要的作用。尽管掩膜阻断算法在多个领域都有成功应用实例,该算法存在着固有的缺陷。为了克服掩膜阻断算法的缺陷,综合分支阻断方法和质量导引方法的优点,提出一种基于分支设置的质量导引相位展开新算法。它先以一个初始质量图来引导分支的设置,然后把分支对应的相位质量设置为最低,从而产生一个新的质量图,最后按新质量图来引导相位展开,并使用几个包裹相位图来验证此方法的有效性。计算机模拟相位图和实际相位图的相位展开结果表明,在存在复杂轮廓不连续和高噪声的情况下,该算法优于模板阻断算法,能得到较好的相位展开结果。

Two-dimensional phase unwrapping method is an active and interesting subject, and plays important roles in a great number of measurement applications. Although mask cut algorithm is successful in some applications, the algorithm has its own drawbacks. In order to overcome the drawbacks of the mask cut algorithm that exists in some successful applications, a new two-dimensional quality-guided phase unwrapping algorithm, based on the placement of the branch cuts, is proposed. The new algorithm combines the advantages of the residue-compensation algorithms and those of the quality-guided ones. In the algorithm, an initial quality map of the wrapped phase image is firstly used to guide the placement of the phase unwrapping. Then the minimum quality value is assigned to pixels that belong to the branch cuts to generate a new quality map. Finally, the new quality map is used to guide the phase unwrapping process. The algorithm has been tested by use of several wrapped images. Computer simulation and experimental results make it clear that the proposed algorithm works more effectively than the mask cut algorithm even when complicated discontinuities and high levels of noise exist in the wrapped phase images.