For a color image, how can we reduce noise using a median filter?

For a color image, how can we reduce noise using a median filter?

Answer 1

[Image Analyst]

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.