Optimized algorithm of laser spot center location in strong noise

Lasers are widely used in optical measurement for their fine directivity and concentrated energy, but it is difficult to locate its center. In this paper, an optimized algorithm is proposed to locate the laser spot in strong noise. In this algorithm, multi frame image superposition is used to remove some noise, modified Zernike moment location formula is utilized to locate edge in subpixel accuracy, Sampling Restraint Hough Transform (SRHT) is adopted to obtain contour points, and the center position of laser spot is acquired with fitting method. The experimented result shows that the optimized algorithm offers great accuracy in position locating for the laser spot with strong noise, and the uncertainty is better than 0.05 pixels.