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Rapid Object Detection Using a Boosted Cascade of Simple Features
Paul Viola, Michael Jones
http://research.microsoft.com/~viola/Pubs/Detect/violaJones_CVPR2001.pdf
Detecting Pedestrians Using Patterns of Motion and Appearance
Paul Viola, Michael Jones, Daniel Snow
http://www.merl.com/reports/docs/TR2003-90.pdf
-Marcelo