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Multimedia Software Engineering, International Symposium on (2004)
Miami, Florida
Dec. 13, 2004 to Dec. 15, 2004
ISBN: 0-7695-2217-3
pp: 546-556
Feng Niu , University of Miami
Mohamed Abdel-Mottaleb , University of Miami
Recognizing human activities from image sequences is an active area of research in computer vision. Most of the previous work on activity recognition focuses on recognition from a single view and ignores the issue of view invariance. In this paper, we present a view invariant human activity recognition approach that uses both motion and shape information for activity representation. For each frame in the video, a 128 dimensional optical flow vector of the region of interest is used to represent the motion of the human body, and a 90 dimensional eigen-shape vector is used to represent the shape. Each activity is represented by a set of Hidden Markov Models (HMMs), where each model represents the activity from a different viewing direction, to realize view-invariance recognition. Experiments on a database of video clips of different activities show that our method is robust.

M. Abdel-Mottaleb and F. Niu, "View-Invariant Human Activity Recognition Based on Shape and Motion Features," Multimedia Software Engineering, International Symposium on(ISMSE), Miami, Florida, 2004, pp. 546-556.
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