Stanford-Online/class2go — pull request #1337 by nyn531 (2012-11-20 02:10:34+00:00)
Title: change key frame extraction code

- Modify difference() function, change it into a graph cut based algorithm.
- To control the key frame numbers, we can either change the input frames_per_minute_target parameter or tune the internal threshold (passing into the localMaximum()).