paper
Human Activity Analysis
Review: ACM 2011
HumanActivityRecognitionReview_2011ACMa16-aggarwal
CVPR 2011: Tutorial on Human Activity analysis
http://cvrc.ece.utexas.edu/mryoo/cvpr2011tutorial/
Blob Detection
1. Several Blob Detection Methods and their application: http://igitur-archive.library.uu.nl/student-theses/2011-0505-200339/Blob%20detection%20Final%20version.pdf