The Image Filtering Algorithm Based on the Enlarged Pixel Domain
At the first, the algorithm unifies the all of the pixel domain within the rectangular pixels to . At the same time, it gave threshold value of the gradient amplitude. Then it calculates the gradient amplitude of each pixel. Finally, by comparing and , the isolated noise pixel is identified. For the noise pixel, we deal it with the median-filtering algorithm. And for the non-noise pixel, we remain them unchanged. So the algorithm did not lose the information of the original image.
Elwin Mao and Linli Xu
W. Q. Wang et al., "The Image Filtering Algorithm Based on the Enlarged Pixel Domain", Advanced Engineering Forum, Vol. 1, pp. 278-282, 2011