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Impulse Noise Removal from Mammogram Images using Combiner Approach

Median filter is quite effective in recovering the images confounded by salt and pepper noise. It discards outliers (impulses) effectively, but it fails to provide adequate smoothing for images corrupted with non-impulse noise. In this paper, two nonlinear techniques for image filtering, namely, New Filter I and New Filter II are proposed based on a nonlinear high-pass filter algorithm. New Filter I is constructed using a median filter, a highpass filter and a combiner. It suppresses uniform noise quite well. New Filter II is configured using midpoint filter, a median smoother of window size 3x3, the high pass filter and the combiner. Both the filters are shown to exhibit good response at the image boundaries (edges). The proposed filters are evaluated for their performance on mammogram test image and the results obtained are included