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Median filtering is a nonlinear operation often used in image processing to reduce "salt and pepper" noise. A median filter is more effective than convolution when the goal is to simultaneously reduce noise and preserve edges. For information about performance considerations, see ordfilt2. The Median Filter block replaces the central value of the 3-by-3 neighborhood with the median value of the neighborhood. This process removes the noise in the image. Use the Video Viewer blocks to display the original noisy image, and the modified image. Images are represented by 8-bit unsigned integers. the filtered signal by the median of a running window through the signal. In the filtering process, the entries of the input signal within each window are sorted in ascending order. an MF replaces the center point of the input data within the window with the median value of that window.