提出了一种提高夏克-哈特曼波前传感器光斑质心的定位精度算法, 分析了光斑质心的探测误差, 采用与光斑尺寸匹配的探测窗口及插值法提高了图像的分辨率, 并使用二阶矩算法计算了质心位置。采用该算法对含有噪声的光斑图进行图像处理与计算, 并给出了待测件的波前重构示意图。结果表明, 相对于传统算法, 该算法将质心的探测精度提高了约0.8倍。

An algorithm to improve the positioning accuracy of spot centroid for Shack-Hartmann wavefront sensor is proposed. The detection errors of spot centroid are analyzed. The image resolution is improved by utilizing the detection window whose size is matched with that of spot and using the interpolation method. The centroid position is calculated by the two-order moment algorithm. The proposed algorithm is used to process and calculate the spot images with noise and the wavefront reconstruction diagram of the test component is also presented. The results show that, compared with the traditional algorithm, the proposed algorithm improves the detection accuracy of centroid by about 0.8 times.