Abstract
In this paper a novel Modified Directional Weighted Median Based (MDWM) filter has been proposed, which is based on the differences between the current pixel and its neighbors aligned with four main directions. A direction index is used for each edge aligned with a given direction. Then, the minimum of these four direction indexes is used for impulse detection. Known median-based de-noising methods tend to work well for restoring the images corrupted by random-valued impulse noise with low noise level but poorly for highly corrupted images. Extensive simulations showed that the MDWM filter provides better performances of suppressing impulse with high noise level which may enhance the performance in terms of removal of random-valued impulse noise compared to the DWM filter.
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