基于枝切截断的高质量相位解缠算法

Robust and Efficient Phase Unwrapping Algorithm Based on Branch Cut

针对传统枝切截断相位解缠算法受残差检测理论缺陷的影响,不能实现对相位完全正确解缠,在总结枝切截断法和质量图导向法的基础上,提出一种新的相位解缠算法。在残差检测理论的基础上,使用一种新的表征相位质量的可靠性导向图指导放置枝切阻断线,对低质量相位的界定使用一种自适应阈值的方法使残差检测达到最优,提高了相位解缠的质量。对于一些背景噪声严重的情况,调制度预处理的方法提高了相位解缠的鲁棒性。实验结果表明,该算法能自动避开相位不连续区域,得到较高质量的相位解缠结果。

A new 2-D branch cut phase unwrapping algorithm is presented based on a combination of both residues theory and quality map method. The residue theory is used to check the residues firstly, then a new reliability ordering map to guide to the placement of the branch cuts, is proposed. An adaptive threshold method is used to check the low quality phase of the quality map and improve the quality of residue checking. According to serious background noise phase, a new pretreatement method is described, and the robustness of phase unwrapping is improved. The algorithm overcomes the shortcoming of branch cut method： the residue theory is just a sufficient and unnecessary condition for the original phase discontinuity. It avoids the quality method totally dependent on the quality map. Experimental resuits show that the proposed algorithm is effective and robust to the phase unwrapping.