The method I implemented was inspired by and closely follows Video Abstraction:
Winnemoller, H., Olsen, S.C., and Gooch, B. 2006.
Real-Time Video Abstraction, ACM Transactions on Graphics (Proc. Siggraph). 25(3), 1221-1226.
The image is bilaterally filtered, then edges are blackened and the intensity channel is quantized.
The user can control the distance and color sigma of the bilateral filter, the threshold of edge strength at which to blacken, and whether or not quantization should be performed and at how many levels.
Download it! (win32 only)
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