为保证二维相位展开的正确性和快速性，分析了现有路径相关二维相位展开算法的优缺点，提出了一种基于质量线导向的二维相位展开新方法，并对新方法进行了综合对比实验和理论分析。新方法定义了相位质量因子及相位方向因子，采用双阈值和非极大值抑制的方式有方向性和有选择性地生成了一种新的枝切线，对生成的枝切线进行平衡处理，以处理后的枝切线为导向进行二维相位展开。理论分析和实验结果表明，新方法综合了现有路径相关二维相位展开方法的优点，速度快、稳定性高，生成的枝切线位置准确，很好地截断了相位突变区域，保证了二维相位展开结果的正确性，具有广泛的适用性。

A novel phase unwrapping method guided by a new kind of branch cut called "quality cut" is proposed after analysis of the many existing path-following methods. The quality cut is defined by means of double thresholds and non-maximum suppression with predefined phase quality factor and phase orientation factor. Then the quality at is balanced through expansion, and the phase unwrapping procedure is conducted by the guidance of the quality cut. The perfect location of the quality cut makes the unwrapped phase more reliable and more accurate. Experiments demonstrate the comprehensive result with high accuracy, fast speed and great stability, indicating the practical applicability of the proposed method.