Siddhartha Maddi

Structure from Statistics - Unsupervised Activity Analysis using Suffix Trees

Irfan A. Essa, Aaron F. Bobick, Raffay Hamid, 2007, 2007 IEEE 11th International Conference on Computer Vision.

Unsupervised Activity Discovery and Characterization From Event-Streams pdf

Irfan A. Essa, Aaron F. Bobick, Charles Lee Isbell, 2005, UAI.

A novel sequence representation for unsupervised analysis of human activities

Irfan A. Essa, Aaron F. Bobick, Raffay Hamid, 2009, Artif. Intell..