An improved three states filter algorithm for impulse noise removal

The Tri-State Median Filter (TSM), which incorporates the traditional standard median(SM) filter and the center weighted median (CWM) filter into image processing. TSM put the difference between the result of SM and CWM filters and the original value as a reference of noise detection, which preserves more image details and enhance the effect of the filter. This article is based on the TSM, breaking the traditional mode and combining Adaptive Median Filter (AMF) with Decision based-Algorithm (DBAIN).Experiment results show that this paper´s method has a better filtering effect than TSM.