Probabilistic Human Recognition from Video

TitleProbabilistic Human Recognition from Video
Publication TypeBook Chapters
Year of Publication2002
AuthorsZhou S, Chellappa R
EditorHeyden A, Sparr G, Nielsen M, Johansen P
Book TitleComputer Vision — ECCV 2002Computer Vision — ECCV 2002
Series TitleLecture Notes in Computer Science
Pagination173 - 183
PublisherSpringer Berlin / Heidelberg
ISBN Number978-3-540-43746-8

This paper presents a method for incorporating temporal information in a video sequence for the task of human recognition. A time series state space model, parameterized by a tracking state vector and a recognizing identity variable , is proposed to simultaneously characterize the kinematics and identity. Two sequential importance sampling (SIS) methods, a brute-force version and an efficient version, are developed to provide numerical solutions to the model. The joint distribution of both state vector and identity variable is estimated at each time instant and then propagated to the next time instant. Marginalization over the state vector yields a robust estimate of the posterior distribution of the identity variable. Due to the propagation of identity and kinematics, a degeneracy in posterior probability of the identity variable is achieved to give improved recognition. This evolving behavior is characterized using changes in entropy . The effectiveness of this approach is illustrated using experimental results on low resolution face data and upper body data.