An efficient approach to Salt & Pepper Impulse Noise Reduction using Iterative Impulse Detection and Correction Phases

The paper presents an improved median filter for salt & pepper impulse noise removal. The computationally efficient filtering technique is implemented as a two pass algorithm involving identification of corrupted pixels that are to be filtered are perfectly detected into a flag image using an iterative fixed sized smaller window approach and modification of them by a valid median. Experimental results have shown that the proposed algorithm performs far more superior than many of the median filtering techniques reported in terms of retaining the fidelity of the image highly corrupted by impulse noises even to the tune of ninety percent impulse noise.