| 速率控制与容错联合编码方案 |
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| 引用本文： | 崔玉斌,蔡安妮.速率控制与容错联合编码方案[J].北京邮电大学学报,2008,31(3):80-83. |
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| 作者姓名： | 崔玉斌 蔡安妮 |
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| 作者单位： | 北京邮电大学,电信工程学院,北京,100876;北京邮电大学,电信工程学院,北京,100876 |
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| 摘 要： | 针对移动网络中低时延视频应用的诸多约束，提出了一种速率控制和容错编码相结合的H.264视频通信新方案．采用预编码阶段估计出的视频帧及其内部宏块对传输差错的敏感度，设计了自适应的帧级和宏块级目标比特分配方法．根据视频片(slice)中对差错敏感的宏块所占的百分比为其设置了重要性等级，采用Turbo码对不同重要性的片进行不均等差错保护(UEP)．实验结果显示，此方案与传统的H.264速率控制与容错算法相比，在解码端可以获得超过1dB的亮度PSNR增益．
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| 关 键 词： | 视频编码 速率控制 容错编码 |
| 收稿时间： | 2007-10-30 |
Joint Rate Control and Error Resilience Coding Scheme |
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| CUI Yu-bin,CAI An-ni.Joint Rate Control and Error Resilience Coding Scheme[J].Journal of Beijing University of Posts and Telecommunications,2008,31(3):80-83. |
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| Authors: | CUI Yu-bin CAI An-ni |
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| Affiliation: | Telecommunication Engineering School, Beijing University of Post and Telecommunications, Beijing 100876, China |
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| Abstract: | A joint H.264 rate control and error resilience coding scheme is proposed to overcome constraints of low delay mobile video applications. The estimated transmission error sensitivity (ES) of the current frame and its contained macroblocks (MB) derived in pre-encoding stage are used to adaptively allocate target bits for frame and MB respectively. An importance level is set to each video slice based on the percentage of its contained high ES MBs, and an unequal error protection (UEP) with Turbo-codes is applied to slices based on their importance levels. Simulation shows that our scheme can obtain more than 1dB luminance PSNR gain on average compared with the conventional H.264 rate control and error resilience algorithms. |
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| Keywords: | video coding rate control error resilience |
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