人眼波像差测量中形心探测的新方法

子孔径光斑的形心探测和计算精度是影响哈特曼传感器波像差探测精度的重要因素，而探测窗口的选取对探测误差的影响很大。分析了Prieto等人采用的逐步缩小窗口尺寸的探测方法，并根据哈特曼波前传感器探测人眼波像差的光斑特点，采用模板匹配法选取光斑窗口的形心探测方法。该方法与Prieto的方法相比提高了探测精义。光斑阵列的仿真计算结果表明，用文中采用的方法探测误差的均方根值降低了53．7％。另外，该方法还避免了Prieto方法中多次迭代计算，减少了运算量。

New method of centroid detection in wavefront aberration measurement of human eye

Detecting and calculating accuracy of centroid of light spot is an important factor which affects the detecting accuracy of Hartmann wavefront sensor. The influence of window selection on centroid detection error is great. The Prieto's method of progressively reducing window size is analysed, and the template matching method is adopted according to the feature of the light spots of Hartmann sensor. With template matching, the accuracy of centroid detection is improved. The computer simulation of the centroid calculations of spot array shows that the centroid's rms error can be decreased by 53.7%. In addition, the template matching method avoides iterative centroid calculations and reduces computer time consumption.