并行视频序列MPEG-2编码的优化联合码率控制

针对数字电视广播以及视频点播(VOD)应用环境中的多路视频节目并行编码传输，提出了一种优化的联合分层码率控制模型。该模型吸取了基于TM5码率控制策略中采用全局图像编码复杂度的统计测度，在GOP(Group of Pictures)结构中建立多路视频序列并行图像合帧的统计编码复杂度测度；根据变换编码器的信源模型和各序列图像帧平均量化误差的码字预测，在图像层进行并行序列的联合码率分配。实验结果表明，各路视频节目图像质量趋于一致。

Optimized Joint Rate Control of Parallel MPEG-2 Coding for Multiple Video Sequences

An optimized joint hierarchical bit allocation model was proposed for parallel compression and transmission of multiple video programs in VOD (video on demand) and digital TV broadcasting. This model adopts a reasonable statistical picture complexity measure of multi-program super picture for bits allocation on the basis of global picture complexity measure of TM5 in GOP (group of pictures) level, and assigns target bits for every program picture according to the bits estimation with average quantization distortion on the basis of a source model for a transform video coder. It is utilized to allocate the available bits to maintain a consistent picture quality between the programs as shown in the experimental results.