title: Image Edge Detection in C++
body: <p>I am trying to find a way to determine the correctness of edge detection. I want it to have little markers showing where the program determines the edges to be with something like x's or dots or lines. I am looking for something that does this: <a href="http://en.wikipedia.org/wiki/File:Corner.png" rel="nofollow">http://en.wikipedia.org/wiki/File:Corner.png</a></p>