基于H.263协议的极低码率视频编码系统的一种实现

基于H.263协议的极低码率视频编码系统的一种实现 A IMPLEMENTATION OF VERY LOW BITRATE VIDEO CODING SYSTEM BASED ON H.263 PROTOCOL 刘立海 Liu Lihai 1 first-author 罗学金 Luo Xuejin 1 蔡芹 Cai Qin 1 王延平 Wang Yanping 1 武汉大学电子信息学学院 武汉大学电子信息学学院 College of Electronic Information, Wuhan University College of Electronic Information, Wuhan University 提出了基于Ｈ．２６３协议的极低码率视频编码系统的一种具体实现，详细地讨论了码率控制算法和运动估计的搜索算法．其中该系统采用的自适应码率控制方法，能够动态地控制码率到指定的数值．提出的一种局部最优搜索算法，与全局最优搜索相比，大大地减少了搜索时间，而信噪比相差不大． A practical implementation of very low bitrate video coding system based on H.263 protocol is proposed. The rate control algorithm and search algorithm of motion estimation are discussed in detail. An adaptive rate control method is adopted by this system, which can dynamically control the bitrate to the assigned value. A local optimal search algorithm is proposed for motion estimation. Compared with the full search method, this algorithm sharply reduces the search times, but maintains a relatively high signal noise ratio. H．263 码率控制 运动估计 全搜索 局部最优搜索 H.263 rate control motion estimation full search local optimal search TN941.1 国家自然科学基金(61672102) 1998-03-01 2021-04-01 3