Add an example showing how the contour can be processed

[thhart]

Maybe I am missing some fundamental documentation but I did not find anything to extract shapes from segmentation algorithms for further processing. I see how it would be possible to compute from its result but I am wondering if there is some code already?!

[lessthanoptimal]

Right now there isn't any examples of high level processing of polygons. Inside of BoofCV polygon detection is used exclusively for fiducial detection. So the primitive shape is all that's needed.

[lessthanoptimal]

I recently added a much faster contour algorithm. If you see an example some place on the web where they used contour I'll see if making a BoofCV port of the example makes sense. Otherwise I'll close this ticket soon.