恒定速率视频编码转换码率控制策略  

Rate Control Strategy in CBR Video Transcoding

作　　者：金钟[1] 李晓辉[1] 

机构地区：[1]安徽大学计算智能与信息处理教育部重点实验室,安徽合肥230039

出　　处：《微机发展》2002年第6期15-18,共4页Microcomputer Development

基　　金：安徽省教育厅科研项目资助 (2 0 0 1kj0 0 1)

摘　　要：分析了恒定速率视频编码转换缓冲区的状态 ,导出了编码转换缓冲区为防止解码器缓冲区下溢和上溢应满足的条件 ,建立了视频编码转换模型。并使用小波变换系数来表征图像特性 ,提出了基于图像特征的码率控制策略。模拟实验表明 ,该码率控制策略能有效地减少、避免缓冲器出现上、下溢的情况 ,使输出码率趋于稳定 ,提高了重建视频图像的信噪比。Analyze the status of constant bir rate(CBR) video transcoder buffer. Derive the conditions that have to be met by both the encoder and transcoder buffers for preventing the decoder buffer from underflowing or overflowing. Establish a model of video transcoding. Denotes the characteristics of the image by the distributed characteristics of the wavelet coefficients. A new rate control strategy based on the characteristics of the image is proposed, The experiment shows that this rate control strategy can effectively reduce and avoid the overflow and underflow of the encoder buffer, and the output bit rates tend to stabilization. The peak signal-to-noise ratio (PSNR) of the reconstructed image is raised.

关 键 词：恒定速率 视频 编码转换 缓冲区分析 码率控制 

分 类 号：TN919.81[电子电信—通信与信息系统]