Kerr D, Kaufmann G H, Galizzi G E
Appl Opt. 1996 Feb 10;35(5):810-6. doi: 10.1364/AO.35.000810.
Current whole-field interferometric techniques yield a phase distribution in modulo 2π. Removal of the resulting cyclic discontinuities is a process known as unwrapping, which must be performed before the data can be interpreted. We investigate an iterative unwrapping technique recently published by Ghiglia and Romero [J. Opt. Soc. Am. A 11, 107 (1994)], which is based on least-squares minimization, obtained by the discrete cosine transform. We apply this technique to remove phase wraps from electronic speckle pattern interferometry data, using modest personal computer hardware. The algorithm is shown to be fast, easy to implement, robust in the presence of noise, and able to handle phase inconsistencies without propagating local errors.
当前的全场干涉测量技术产生的相位分布是模2π的。消除由此产生的循环不连续性是一个称为解缠的过程，必须在数据能够被解释之前执行。我们研究了Ghiglia和Romero最近发表的一种迭代解缠技术[《美国光学学会志A》11, 107 (1994)]，该技术基于离散余弦变换获得的最小二乘最小化。我们使用普通的个人计算机硬件，将该技术应用于从电子散斑图案干涉测量数据中去除相位包裹。结果表明，该算法速度快、易于实现、在存在噪声的情况下具有鲁棒性，并且能够处理相位不一致性而不传播局部误差。
