SNLM: A switching non-local means filter for removal of high density salt and pepper noise

A switching non-local means (snlm) filter is presented for high-density salt and pepper noisereduction. firstly, the impulse noises are detected, based on the fact that their values must be the extremegray-level of the image. then, at the filtering stage, the noise-free pixels remain unchanged and noisy pixelsare restored using a modified non-local means filter. however, to calculate the weights of the filter, onlynoise-free pixels are considered. it means that in a search window around the noisy pixel, some smallpatches are taken into account around noise-free pixels and the similarity between these patches and thecentral patch determines the weights. experimental results show that the proposed method can providebetter performance than many of the existing impulse denoising methods in high-density impulse noisein terms of psnr, and mae.