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並列摘要


The human behaviors are frequently analyzed by using the uncompressed video data (raw data). However, the amount of uncompressed video data is too huge to transmit via the network with limited bandwidth. Hence, the rare behavior detection within the compressed video may not only extract the visual features directly from MPEG compressed video but also overcome the limited network bandwidth problem. In this paper, several visual features extracted from the compressed video, e.g., the motion vectors and color feature are applied to develop new action feature descriptor. Based on the action feature descriptor the human actions are detected and then the rare behaviors may be identified. The proposed human action analysis system consists of following novel technologies: (1) Partial decoding of the compressed video stream and extracting of the motion vectors from the p-frame in each GOP, (2) Generation of the object-based accumulative motion vector (OAMV) from continuous three GOPs, (3) Construction of Motion History Polar Histogram (MHPH), and (4) Utilizing of Adaboost algorithm to recognize various kinds of human actions. Experimental results show that the recognition rate can approach 90%.

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