Paul DaGraca, Anthony Vetro, Ajay Divakaran, Huifang Sun: Networked surveillance and control system. Mitsubishi Electric Research Laboratories, Dirk Brinkman, November 11, 2003: US06646676 (121 worldwide citation)

A surveillance and control system includes a feature extraction unit to dynamically extract low-level features from a compressed digital video signal, a description encoder, coupled to the feature extraction unit, to encode the low-level features as content descriptors. An event detector is coupled ...