Huntley J M, Saldner H
Appl Opt. 1993 Jun 10;32(17):3047-52. doi: 10.1364/AO.32.003047.
A new algorithm is proposed for unwrapping interferometric phase maps. Existing algorithms search the two-dimensional spatial domain for 2π discontinuities: only one phase map is required, but phase errors can propagate outward from regions of high noise, corrupting the rest of the image. An alternative approach based on one-dimensional unwrapping along the time axis is proposed. It is applicable to an important subclass of interferometry applications, in which a sequence of incremental phase maps can be obtained leading up to the final phase-difference map of interest. A particular example is quasi-static deformation analysis. The main advantages are (i) it is inherently simple, (ii) phase errors are constrained within the high-noise regions, and (iii) phase maps containing global discontinuities are unwrapped correctly, provided the positions of the discontinuities remain fixed with time. The possibility of real-time phase unwrapping is also discussed.
提出了一种用于干涉相位图展开的新算法。现有算法在二维空间域中搜索2π不连续性：只需要一幅相位图，但相位误差会从高噪声区域向外传播，从而破坏图像的其余部分。提出了一种基于沿时间轴进行一维展开的替代方法。它适用于干涉测量应用中的一个重要子类，在这类应用中，可以获得一系列增量相位图，直至得到感兴趣的最终相位差图。一个具体例子是准静态变形分析。主要优点是：（i）本质上简单；（ii）相位误差被限制在高噪声区域内；（iii）只要不连续性的位置随时间保持固定，包含全局不连续性的相位图就能被正确展开。还讨论了实时相位展开的可能性。
