二维相位展开在众多相位测量应用中起着重要作用。在相位展开方法中，质量图能否真实地反映包裹相位质量，在很大程度上决定了相位展开结果是否正确。为了复原可靠的相位轮廓，提出了一种准确的基于相位梯度相关系数的质量图。该质量图可从包裹相位图直接导出，先求出包裹相位图的相位梯度图，由相位梯度图获得每个像素一定邻域内的相位梯度相关系数，再用不同方向的梯度相关系数得到质量图。详细描述了新质量图，并通过展开若干包裹相位图验证其有效性和优越性。相位展开的结果表明，所提出的质量图是一种优良的相位质量指示器，可用于质量引导相位展开算法，复原获得可靠的相位轮廓。

Two-dimensional phase unwrapping plays an important role in many phase measurement applications. In many phase unwrapping algorithms, whether the unwrapped result is correct, to a large extent, depends on whether the quality map can truly reflect the wrapped phase quality. To retrieve a reliable phase profile, an accurate quality map based on correlation coefficient of phase gradient was proposed. The new quality map was directly extracted from the wrapped phase image. The phase gradient maps were obtained firstly from the wrapped phase map, then the phase gradient correlation coefficient of each pixel within its neighborhood was calculated, the quality map was then obtained from the phase gradient correlation coefficient in different directions. The new quality map is described in detail and its effectiveness and advantages were verified by unwrapping several wrapped phase images. Unwrapped results make it clear that the proposed quality map can be used as a good phase-quality indicator, with which the quality-guided unwrapping algorithm can retrieve a reliable phase profile.