MOPS is a useful tool for many computer vision and related applications. They key is that it gives you a way to generate features that are (mostly) invariant to rotation and scale to use as input for machine learning/artificial intelligence algorithms.
http://www.cs.bath.ac.uk/brown/mops/mops.html
Technical report from Microsoft Research:
http://research.microsoft.com/pubs/70120/tr-2004-133.pdf
Nice slide deck on MOPS:
http://www.csie.ntu.edu.tw/~cyy/courses/vfx/08spring/lectures/handouts/lec06_feature2_4up.pdf
Example app from Microsoft Research:
http://research.microsoft.com/en-us/um/redmond/groups/ivm/PhotoTours/
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