CONF Odobez_ECCV_2012/IDIAP Unsupervised Activity Analysis and Monitoring algorithms for Effective Surveillance Systems Odobez, Jean-Marc Carincotte, C. Emonet, Remi Jouneau, E. Zaidenberg, Sofia Raverra, Bertrand Bremond, Francois Grifoni, Andrea human activity recognition surveillance unsupervised learning EXTERNAL http://publications.idiap.ch/attachments/papers/2012/Odobez_ECCV_2012.pdf PUBLIC European Conference on Computer Vision LNCS 2012