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3 March 2008 Statistical motion vector analysis for object tracking in compressed video streams
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Proceedings Volume 6812, Image Processing: Algorithms and Systems VI; 68120Y (2008)
Event: Electronic Imaging, 2008, San Jose, California, United States
Compressed video is the digital raw material provided by video-surveillance systems and used for archiving and indexing purposes. Multimedia standards have therefore a direct impact on such systems. If MPEG-2 used to be the coding standard, MPEG-4 (part 2) has now replaced it in most installations, and MPEG-4 AVC/H.264 solutions are now being released. Finely analysing the complex and rich MPEG-4 streams is a challenging issue addressed in that paper. The system we designed is based on five modules: low-resolution decoder, motion estimation generator, object motion filtering, low-resolution object segmentation, and cooperative decision. Our contributions refer to as the statistical analysis of the spatial distribution of the motion vectors, the computation of DCT-based confidence maps, the automatic motion activity detection in the compressed file and a rough indexation by dedicated descriptors. The robustness and accuracy of the system are evaluated on a large corpus (hundreds of hours of in-and outdoor videos with pedestrians and vehicles). The objective benchmarking of the performances is achieved with respect to five metrics allowing to estimate the error part due to each module and for different implementations. This evaluation establishes that our system analyses up to 200 frames (720x288) per second (2.66 GHz CPU).
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Marc Leny, Françoise Prêteux, and Didier Nicholson "Statistical motion vector analysis for object tracking in compressed video streams", Proc. SPIE 6812, Image Processing: Algorithms and Systems VI, 68120Y (3 March 2008);

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