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Image Analysis and Processing, International Conference on (2007)
Modena, Italy
Sept. 10, 2007 to Sept. 14, 2007
ISBN: 0-7695-2877-5
pp: 536-541
Nagia M. Ghanem , University of Maryland, College Park, USA
Larry S. Davis , University of Maryland, College Park, USA
We present a machine learning approach to detect changes in human appearance between instances of the same person that may be taken with different cameras, but over short periods of time. For each video sequence of the person, we approximately align each frame in the sequence and then generate a set of features that captures the differences between the two sequences. The features are the occupancy difference map, the codeword frequency difference map (based on a vector quantization of the set of colors and frequencies) at each aligned pixel and the histogram intersection map. A boosting technique is then applied to learn the most discriminative set of features, and these features are then used to train a support vector machine classifier to recognize significant appearance changes. We apply our approach to the problem of left package detection. We train the classifiers on a laboratory database of videos in which people are seen with and without common articles that people carry - backpacks and suitcases. We test the approach on some real airport video sequences. Moving to the real world videos requires addressing additional problems, including the view selection problem and the frame selection problem.

N. M. Ghanem and L. S. Davis, "Human Appearance Change Detection," 2007 14th International Conference on Image Analysis and Processing - ICIAP 2007(ICIAP), Modena, 2007, pp. 536-541.
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