How can I quantify difference between two images?

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Track title: Techno Bleepage Open

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Chapters
00:00 Question
00:46 Accepted answer (Score 305)
08:11 Answer 2 (Score 87)
08:34 Answer 3 (Score 70)
09:23 Answer 4 (Score 23)
10:16 Thank you

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Full question
https://stackoverflow.com/questions/1899...

Accepted answer links:
[to normalize]: http://en.wikipedia.org/wiki/Normalizati...)
[compare.py]: http://gist.github.com/626356
[Lucas-Kanade method]: http://en.wikipedia.org/wiki/Lucas%E2%80...
[Courbon et al, 2010]: http://www.sciencedirect.com/science/art...
[Kullback–Leibler distance]: https://en.wikipedia.org/wiki/Kullback%E...

Answer 3 links:
[PIL]: http://www.pythonware.com/products/pil/

Answer 4 links:
[normalized cross-correlation]: http://en.wikipedia.org/wiki/Cross-corre...

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Tags
#python #imageprocessing #backgroundsubtraction #imagecomparison #timelapse

#avk47