Abstract:

The bit-number allocation strategy of Test Model 5(TM5) may cause the coding quality to decrease among sequence code. Therefore an improved algorithm for MPEG-2 target bit-number allocation was proposed in this paper. The influence of smooth on coding quality was analyzed and an approach to improving the coding performance among sequence code was presented to avoid a sharp quality decrease of frames. Simulation results indicate that this improved algorithm provides a promising coding quality among frames at the same code rate.

Key words: terms-motion compensation, motion estimation, bit-allocation control, video coding

摘要：

测试模型5(TM5)的位分配策略对基于图像序列编码的图像质量会造成一定影响。文中在分析测试模型的位分配策略的基础上,给出了一种改进的基于MPEG 2的位分配策略。该策略能够提高序列图像编码质量的平滑性,从而避免图像质量之间的失衡。模拟结果表明,改进的码率控制策略在一定程度上提高了图像的质量,同时还保持序列图像之间的平滑性而保持压缩比不变。

关键词:  运动补偿； 运动估计； 码率分配控制； 视频编码