Abstract:

The centroid detection errors of four methods of centroid detection algorithm about ShackHartmann array spots were compared at the same SNR, during which not only the centroid detection error but also the velocity of detection was taken into account. The experiment results indicate that IWCa has less detection error (CEE<0.5) although the SNR is lower than 5 and the velocity is also great. In consideration of  centroid detection error and detection rate, centroid detection accuracy and rapidity were effectively improved.

Key words: ShackHartmann wavefront sensor； centroid algorithm； centroid detection error； signal noise ratio； time complexity