Edge Detection Edge detection is the process of finding edges in an image. Typically, and edge is thought of as ocurring in an image wherever there is a big change in pixel intensity values along some line in a neighborhood surrounding the pixel. Of course, this is not always true; specularity in an image is one aspect which can fool such a simple algorithm. For the purposes of this applet, though, edges are defined in this way. The CMSC 426 Image Workshop implements two different edge detection filters: a Prewitt filter and a Sobel filter. The Prewitt filter is the standard unweighted gradient filter most people are familiar with:   The Sobel filter is just a weighted version of this: