For a color image, how can we reduce noise using a median filter?
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Image Analyst il 25 Ago 2015
One way is to just run medfilt2() on each color channel, red, green, and blue. Another way is to convert to HSV color space and run it on the V channel, and possibly on the S and H channels if you want. If you have salt and pepper noise, you can use a modified median filter where you replace only the noise pixels with median values and leave the rest of the image intact. I've attached a demo for that.