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Video Object Segmentation and Two Kinds of Object-Oriented Video Coder

WENG Nan shan,CAI De jun (Dept of Electronic & Information Engineering,Huazhong Univ.of Scie. & Tech.,Wuhan 430074,China)  
Video object segmentation is an important task in object based video coding.In this paper,an automatic video segmentation scheme based on higher order statistics (HOS) of displaced frame differences (DFD) and mathematical morphological operators is studied.In this approach,a map (mark) overlapping object is first gotten by thresholding a group of higher order moment maps of DFD,and then a morphological erosion from the boundary of the mark up to the boundary of the object is performed to get the final segmentation map.A simple but efficient algorithm for separating head and shoulder is proposed based on searching for the greatest degree turning point in head shoulder contour curve.Based on segmentation,the MPEG 4 based video coding system we implemented with software is described.Then,a very low bit rate video coder with object oriented bandwidth allocation (OOBA) technology is proposed.Compared with conventional frame based video coder,the OOBA coder can improve subjective quality of images at low bit rate,while decrease PSNR just a little.
【Fund】: 华为科技基金!(No .JJ HZ 6)
【CateGory Index】: TN919.8
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