A new method to calculate the centroid in adaptive optics system

摘要

To improve the centroid detection precision in the adaptive optics system, the center of gravity (COG) with a sliding window is proposed. The method can compute the center of gravity of the image when the target spot is surrounded by the background and the noise. The method makes use of the distribution form and the gray-scale distribution of the target spot and the background as well as the noise. In order to show that the method presented is more accurate than the COG when calculating the centroid of the image, simulations when the photoelectron from the total number of different time, read out the noise variance, spot size radius, and the distance of the signal spot centroid position and the dark background centroid position change are made. Simulation and experiment results show that the centroid calculation accuracy using this method is greatly improved.