Research and Realization of an Anti-noise Auto-focusing Algorithm

To solve the problem that the single-peak and sensitivity of conventional image sharpness functions come down which results in slowing auto-focusing speed or even falling to focus because of noise, an anti-noise auto-focusing algorithm is proposed in this paper. The algorithm uses an anti-noise image sharpness function and a searching strategy that combines coarse focusing with fine focusing to improve auto-focusing speed and sensitivity. The experiment shows that the algorithm enhances focusing efficiency and reliability.