一种宏块级码率控制方案  

Macroblock Layer Rate Control Algorithm

作　　者：程飞[1] 邹雪妹[1] 滕国伟[1] 王国中[1] 

机构地区：[1]上海大学通信与信息工程学院,上海200072

出　　处：《电视技术》2010年第6期23-25,34,共4页Video Engineering

基　　金：上海市信息化委员会项目(沪信息委产[2007]212号)

摘　　要：主要针对现有的码率控制方案在场景变化和运动剧烈的情况下控制不准的缺陷和复杂度过大不适于实际运用的情况,提出了一套新的码控方案,利用当前宏块与前一宏块的相关性和熵编码中的一些特性,巧妙地克服了"蛋鸡悖论",并将其在JM86平台上实现。实验结果表明,与JM86标准代码中的码率控制算法JVT-G012相比,该算法不仅在控制精度上大约提高了0.76kbit/s,而且峰值信噪比平均提高了0.013dB,同时还较好地控制了输出码率和峰值信噪比的波动。In this paper, a new rate control method is proposed which aims to overcome the disadvantages of existing methods, including occurrence of inaccurate control when scenes change and tempestuous movement, and too large complexity that is not suitable for practical application. The proposed algorithm makes use of the correlation of the current and former macroblocks to overcome the egg-chicken paradox, and has been implemented in JM86 （H.264/AVC）. The experimental results show that, compared with JVT-G012 in H.264, the proposed method gains 0.76 kbit/s in control precision and 0.013 dB in PSNR in average. Besides, the fluctuation on bit and PSNR are precisely controlled.

关 键 词：视频编码 码率控制 场景变化 模式选择 

分 类 号：TN919.81[电子电信—通信与信息系统]