Abstract：In the light of most current segmentation algorithms are of high complexity and huge computation, one algorithm of coarse segmentation in compressed domain and refined segmentation in spatial domain is put forward. The initial coarse segmentation masks from the motion vectors are obtained by applying Estimation Maximum(EM) algorithm. These blocks in the masks can be decompressed to obtain the origin image and the actual edges of the objects can be extracted by applying Canny edge detection and edge tracking only in the segmented regions. By using the proposed algorithm, the amount of data needed to be processed is kept in necessarily minimal, saving the computation time as well as gaining the pixel-wise edges of the segmented objects.
王占辉; 刘贵忠; 刘龙; 刘洁瑜. 一种从视频压缩码流中精确提取运动对象的快速算法[J]. 电子与信息学报, 2004, 26(7): 1157-1162 .
Wang Zhan-hui; Liu Gui-zhong; Liu Long; Liu Jie-yu. A Fast and Accurate Moving Object Extraction Method from Compressed Video Stream. , 2004, 26(7): 1157-1162 .
2004, Vol. 26 
