Edge detection based on subwindow-changed multistage median filter

Edge detection is a commonly performed operation in image processing. Many different edge detectors were used in edge detection. However, the results may not be satisfied when they are directly used in digital images which are affected by noise. Therefore, it's necessary for us to smooth the noise before detecting edges. In this paper, based on multistage median filter, a model is introduced for making edge detection. Experimental results show that it yields better performance in smoothing noise while detecting edges.