Pattern Change Discovery Between High Dimensional Datasets



Matlab code of the LRatio algorithm can be downloaded here.

The Google News datasets can be downloaded here.

A Matlab matrix of vectorized faces can be downloaded here and the original picture can be downloaded here.




Detecting the difference between image datasets:

Note that for each pair of faces between A and B, there is a face rotation in 3D space and so a simple difference between the two images does not lead to the detection of the only eye changes.



These videos showcase the difference between two competing algorithms - MRL's LRatio and H. Zhang, J. Shi and M. Visontai. Detecting unusual activity in video. Proc CVPR 2004. Note that the videos will flash RED when activity is detected.



LRatio         Zhang, Shi, and Visontai

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LRatio         Zhang, Shi, and Visontai

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LRatio         Zhang, Shi, and Visontai

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Download video (right click, save as...)   .avi