| 低比特率视频编码中一种有效的码率分配算法 |
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| 引用本文： | 周树民,李锦涛,黄晁.低比特率视频编码中一种有效的码率分配算法[J].计算机辅助设计与图形学学报,2005,17(11):2558-2564. |
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| 作者姓名： | 周树民 李锦涛 黄晁 |
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| 作者单位： | 中国科学院计算技术研究所数字化技术研究室,北京,100080;中国科学院计算技术研究所数字化技术研究室,北京,100080;中国科学院计算技术研究所数字化技术研究室,北京,100080 |
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| 基金项目： | 国家自然科学基金（60302028）. |
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| 摘 要： | 引入能较好地反映视频图像运动特性的差分帧直方图（HOD）来预分配码率.对于运动较为平稳的序,提出了基于HOD的分段常数码率预分配算法.帧级码率预分配根据视频原始序列HOD的统计特性来决定;对于运动程度变化较大的序列,采用修正后的线性HOD模型来预分配码率.实验结果表明,相对于H.264 JM76中的分配算法,该算法使得R-D性能平均提高0.35/dB,视频主观质量的下降也得到了有效的改善.
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| 关 键 词： | 比特预分配 码率控制 差分帧直方图 |
| 收稿时间： | 2004-09-06 |
| 修稿时间： | 2004-09-062005-04-11 |
Efficient Bit Allocation Scheme in Low Bit Rate Video Coding |
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| Zhou Shumin,Li Jintao,Huang chao.Efficient Bit Allocation Scheme in Low Bit Rate Video Coding[J].Journal of Computer-Aided Design & Computer Graphics,2005,17(11):2558-2564. |
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| Authors: | Zhou Shumin Li Jintao Huang chao |
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| Affiliation: | DTL Institute of Computing Technology, Chinese Academy of Sciences, Beijing 100080 |
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| Abstract: | Histogram of differential frame(HOD) was introduced to allocate bits on frame level since it could indicate the motion degree of a picture effectively.Based on HOD pre-analysis,a frame-layer bits allocation scheme is proposed to replace the one used in AVC.In the scheme,a new model of sectional constant frame-layer bits allocation is proposed when motion distribution in a sequence is continuous.Otherwise,a revised linear HOD model is used to allocate bits for a frame if there is abrupt motion change.The final simulation shows that compared to H.264 JM76,the proposed bits allocation scheme improves R-D performance by 0.35?dB on average and manifests a more smooth subjective quality degradation. |
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| Keywords: | frame-layer bits allocation rate control histogram of differential frame |
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