An improved detail preserving filter for the elimination of high density salt and pepper noise in images & videos

An improved detail preserving filter for the elimination of high density salt and pepper noise is proposed. A fixed 3x3 window is kept constant for the increasing noise densities. The pixel is termed as noisy, if the processed pixel is between the outliers. The corrupted pixel is replaced by unsymmetrical trimmed mean or median or midpoint or mean of the current processing window based on the content of the current processing window. The proposed algorithm (PA) is employed on different varying detail images. The proposed algorithm is compared with the standard and existing algorithms and found to exhibit good noise suppression capability. The algorithm also shows a good qualitative and quantitative results for increasing noise densities. The proposed algorithm removes salt and pepper noise at high noise densities by preserving fine details of an image.