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在基于相位信息的三维面形测量中,为了得到正确的相位展开而引入的截断线和为了便于三维拼接而附加在物体表面的标志点都会造成其覆盖区域的相位缺失,需要进行人为地插补修复。一种新的缺失相位插补方法——八方向梯度估算法,通过计算待插补点周围八方向梯度和其八邻域内的相位平均值,可估算出缺失的相位。与其它常用缺失相位插补方法相比,该方法运算速度快、插补效果好,运算过程无需人为参与,便于计算机自动实现,尤其适合于插补倾斜相位面上的较大标志点,有助于提高相位重建质量和在此基础上的三维面形重建质量。
In the three-dimensional surface measurement based on phase information, the truncation lines introduced to obtain the correct phase unwrapping and the sign points attached to the surface of the object to facilitate the three-dimensional splicing will cause the missing phase of the coverage area, which needs to be artificially interpolated repair. A new missing phase interpolation method - eight-direction gradient estimation method can estimate the missing phase by calculating the eight-direction gradient around the point to be interpolated and the phase averages within eight neighborhoods. Compared with other commonly used missing phase interpolation methods, the proposed method has the advantages of fast calculation speed, good interpolation effect, and no need for human intervention in the calculation process, which is convenient for the computer to automatically realize, and is especially suitable for interpolating larger marking points on the inclined phase plane, To improve the quality of phase reconstruction and on this basis, the quality of three-dimensional reconstruction.