| 基于DCT的帧内视频编码器的缓存控制技术 |
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| 引用本文： | 楼生强,皇甫堪,周良柱,万建伟.基于DCT的帧内视频编码器的缓存控制技术[J].国防科技大学学报,1998,20(4):59-64. |
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| 作者姓名： | 楼生强 皇甫堪 周良柱 万建伟 |
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| 作者单位： | 国防科技大学电子技术系 |
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| 摘 要： | 提出一种基于ＤＣＴ的帧内视频编码器的缓存控制技术。它根据视频图像各种子块的比例及其相应的Ｒ－Ｑ曲线确定量化因子，通过再编码，调整子块Ｒ－Ｑ曲线的拟合参数使其自适应视频图像的场景变化。同时本文提出了一个简单有效的图像子块分类方法，分类结果基本上与根据编码子块所需比特数分类子块的结果相一致。此法用于缓存控制的额外计算量小，并能扩展应用于Ｈ．２６１、ＭＰＥＧ等视频编码标准中。模拟结果表明，此法在视频序列的场景发生变化时，再编码次数少，输出码率恒定。
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| 关 键 词： | 缓存控制，视频编码 |
| 收稿时间： | 1997/7/11 0:00:00 |
A Buffer Control of DCT-Based Intrafield Videl Coding |
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| Lou Shengqiang,Huangfu Kan,Zhou Liangzhu and Wan Jianwei.A Buffer Control of DCT-Based Intrafield Videl Coding[J].Journal of National University of Defense Technology,1998,20(4):59-64. |
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| Authors: | Lou Shengqiang Huangfu Kan Zhou Liangzhu and Wan Jianwei |
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| Affiliation: | Department of Electronic Technology, NUDT, Changsha, 410073;Department of Electronic Technology, NUDT, Changsha, 410073;Department of Electronic Technology, NUDT, Changsha, 410073;Department of Electronic Technology, NUDT, Changsha, 410073 |
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| Abstract: | A new buffer-control policy for DCT-based intrafield video coder is presented. It selects quantization parameter based on the number of three kinds of blocks in a picture and the rate-quantization models (R-Q model) for three kinds of blocks. It adapted to the scene changes through re-encoding the picture and adjusting the R-Q model. A simple and effective criterion is presented to classify the blocks, the classifying result based on it is close to the result gotten through quantizing the bits needed to code a block into three levels. This method can be applied to some other coding techniques such as H.261; MPEG, extra computations are modest. Simulation results show that this buffer control policy can control the output bit rate steadily even at scene changes. |
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| Keywords: | buffer control video coding |
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