New region-growing algorithm for phase unwrapping

Phase unwrapping is a key step in the interferometric phase analysis. Affected by noise or sub-sampling, the traditional algorithm cannot restore the real phase well and the errors spread along the direction of the unwrapping and make lines in the real phase. A region-growing algorithm based on predictions and guided by quality map is described. It can be applied to the three-dimensional measurement and work well even in the lower noise-signal-ratio or sub-sampling conditions. The algorithm and an example of human body plaster model are also given. The result shows that the region-growing algorithm is efficient and feasible.