AVS2视频编码码率控制算法  

Rate control algorithm of AVS2 video coding

作　　者：罗敏珂 周益民[1,2] 钟敏[1] 朱策[2] 

机构地区：[1]电子科技大学计算机科学与工程学院,四川成都611731 [2]电子科技大学机器人研究中心,四川成都611731

出　　处：《系统工程与电子技术》2016年第9期2192-2200,共9页Systems Engineering and Electronics

基　　金：国家高技术研究发展计划(863计划)(2015AA015903);国家自然科学基金(61571102);四川省科技支撑计划(2014GZ0005);中央高校基本科研业务费(ZYGX2015J065)资助课题

摘　　要：码率控制是视频图像编码技术中的重要组成部分,旨在受限的通信带宽下提供最小失真的图像质量同时保证比特流的平稳输出,长期以来既是研究重点也是应用热点。面向中国自主知识产权的新一代音视频编码标准(audio video coding standard 2.0,AVS2)中码率控制技术,将模糊控制理论与码率控制相结合,提出了一种新的码率控制算法。首先根据模糊控制器原理建立快速查询表,接着基于指数率失真模型进行了基本论域到模糊子集论域的映射,而后将假设参考解码缓冲区反馈值及其差值带入模糊控制查询表得出量化参数(Quantization Parameter,QP)值变化增量。最终的编码过程采用系统QP值与增量之和来进行。在通用测试条件下的实验结果表明,新算法比特率失真比率(Bjntegaard delta bit rate,BDBR,BD-rate)取得增益效果明显,比特率控制精度高。算法实现简洁,计算复杂度低,特别适合恒定目标比特率编码端速率控制。相关成果已被AVS2标准工作组采纳,集成在参考模型软件RD10.0中。Rate control is an essential component of the video coding technology, focusing on providing theminimum distortion of video image quality under the limited bandwidth of communication as much as possible. Itis developed as a research hot spot. The work is meant for the new generation of audio video coding standard（AVS2） in the rate control technology, combining the fuzzy control theory and the rate control, a new rate controlalgorithm is proposed. First, a fast lookup table is created depending on the principle of the industrial fuzzycontroller. Second, a mapping from the functional domain to the internal domain is created. Third, an incrementalquantization parameter （QP） value can be found when taking the hypothetical reference decoder buffervalues and its error values into the fuzzy controller query. Finally, the encoder adopts the system QP with its increment.The experimental results show that, under the common test condition, the rate control algorithm canachieve significant BD-rate gain and maintain high bit rate accuracy. The proposed algorithm is applied simplywith low computational complexity. This proposal particularly suitable for constant target bit rate control. Thiswork is approved by the AVS2 standard working group and integrated into the reference software model RD10. 0.

关 键 词：码率控制 模糊控制器 率失真模型 率失真优化 

分 类 号：TN919.8[电子电信—通信与信息系统]