Introduction - If you have any usage issues, please Google them yourself
R. Chaudhry, A. Ravichandran, G. Hager and R. Vidal
Histograms of Oriented Optical Flow and Binet-Cauchy Kernels on Nonlinear Dynamical Systems for the Recognition of Human Actions
CVPR 2009
(c) Rizwan Chaudhry- JHU Vision Lab