当相移器存在的相移误差包括位移误差与倾斜误差时，同一幅干涉图诸像素点的相移并不同步，但其相移量在同一平面上。
If the reference mirror has tilt and piston errors caused by phase-shifting, the phase shifts of the pixels along the same interferogram are not a constant, but they are still kept on the same plane.
实验中分别应用了爬山搜索法和相关系数拟合法来分别搜索整像素的位移和亚像素的位移。
In the experiment, a mountain-climbing searching method and a curve-fitting method were employed to determine the integral pixel displacement and the sub-pixel displacement respectively.
检测系统达到了亚像素级的位移分辨率。
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