Boundary Based Progressive Switching Median (BPSM) filter is a median-based filter proposed to restore images corrupted by salt and pepper noise and to preserve boundaries in image. The algorithm is followed by the following three steps: 1) an algorithm is used before filtering, to detect the corrupted pixels called impulse (salt and pepper)detection 2) The detection of impulse and filtering of noise are applied step by step process through several iterations, called progressive.3)boundary

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... ing is done to preserve edge information. Simulation results reveals that the proposed algorithm is superior than Progressive Switching Median (PSM) filters and is particularly effectual for the cases where the images are very highly corrupted in boundaries. GENERAL TERMS: Image enhancement, impulse detection, PSM filter, nonlinear filter.