Research On The Shape Coding System Combined With Object Segmentation

Along with the unceasing maturity of multimedia technique, people have advanced new and higher requirements for the processing mode of multimedia and paid more attention to the interactivity and flexibility. The conventional video coding/decoding technique adopts frame-based coding technique, while MPEG-4 coding/decoding standard adopts object-based coding technique. MPEG-4 standard divides video into different,consecutively moving video objects and codes every object separately. Each object includes three kinds of information: the shape information,the texture information and movement information. The three kinds of information of every video object are needed to code. One of the core techniques in MPEG-4 is the part of shape coding. By reason of having adopted the shape coding technique, MPEG-4 has the larruping ability—the content-based interactivity.The research on the video object segmentation and the shape coding is always isolated. Based on the progress of the research on the shape coding, the combination of the video segmentation and the shape coding is researched carefully. The main work includes:1,The image segmentation technology based on Active contour models is researched. The parameter models and geometrical models is analysed and compared, and a geometrical models, level sets methods, is researched especially.2,A moving object segmentation algorithm based on the level set methods is proposed. Take the luminance difference as the primary zero level set, and segment the object by narrow band algorithm.3,A new shape coding based on the base-line is proposed. Since the shortness of the current algorithm, proposes a new algorithm which can adapt to any direction of the outline, as well as a new decode method.4,A new system which is called shape coding system combined with the object segmentation is proposed. In MPEG-4, the middle process results in too more time cost and errors, so proposes a new system, which coding shape jusr after the object segmentation. The new system can save the time and the errors.