H．264／AVC中基于模式归类的快速模式选择算法  

FAST MODE DECISION METHOD BASED ON MODE GROUPING FOR H.264/AVC

作　　者：吕保华 王淑慧[2] 

机构地区：[1]上海中荷环保有限公司,上海200023 [2]同济大学超大规模集成电路研究所,上海200092

出　　处：《计算机应用与软件》2008年第4期224-225,243,共3页Computer Applications and Software

摘　　要：针对H.264/AVC中复杂的模式选择问题,通过分析一幅编码图像内最终选择的模式的分布规律,将所有编码模式分成若干子集,利用前一帧模式分布情况,对当前帧选择合适的子集进行编码。同时在场景变化较大时激活所有编码模式并提出检测场景变化的机制。实验结果表明:在信噪比和比特率保持相近的前提下,减少的总编码时间在48%～66%之间。An approach is presented to speed up the mode decision process in a H. 264/AVC encoder. The distribution of the encoding modes adopted finally in a frame is analyzed, and all the encoding modes are divided into several subsets. Based on the mode distribution of the previous frame, in the current frame only the modes in a proper subset are selected for the encoding process. Meanwhile ,all the encoding modes are activated when scene change occurs,and a scheme for scene change detection is proposed. The simulation results show that compared with the original encoder,the proposed method achieves a reduction of 48% - 66% encoding time and keeps almost the same PSNR and bit rate.

关 键 词：模式选择 历史信息 子集 场景变化 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构] TN919.81[自动化与计算机技术—计算机科学与技术]