A new method for enhancing the detection accuracy of the centroid of focal spot is put forward based on the image procesing techniques.After the Hartmann-Shark(H-S) wavefront sensor gets a series of focal spot array images,the subaperture detection windows are optimized by the adaptive threshold method for the optimum matching between the detection windows and the corresponding focal spots distribution areas and then the linear interpolation is used in the detection windows for higher precision ...