Adaptive Median Filter Based on SNR Estimation of Single Image

An adaptive median filtering method based on SNR estimation of single image is presented in this paper. The proposed method first innovatively estimates SNR of an image degraded by salt & pepper noise, and then adaptively chooses window size of median filter. Estimation of single image´s SNR provides guidance for the judgment on noisy or non-noisy image, and even noise density. This is helpful for dealing with salt & pepper noise, such as adaptive determination of window size in median filter. The new method was compared with classic median filter with fixed window size on a variety of images, and experimental results show its effectiveness.