计算机与现代化 ›› 2013, Vol. 1 ›› Issue (9): 126-129.doi: 10.3969/j.issn.1006-2475.2013.09.031
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李 伟，门 佳
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LI Wei, MEN Jia
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摘要： 针对H.264/AVC视频压缩标准的JVT-H017提案改进了基本单元层码率控制方法，为获得精确的量化参数，提出一种新式的预测模型，充分利用视频信源的空时相关性特征，用一个时域空域三维相关模型代替线性模型来预测基本单元的平均绝对差值，并且根据同一基本单元内各宏块图像复杂度差异自适应地调整量化参数。实验结果表明，改进后的算法避免参数更新过程以减少计算量，能改善视频编码质量，提高输出码率的控制精度。
关键词: 码率控制, 基本单元层, 空时相关性, 自适应目标比特分配
Abstract: In order to obtain accurate quantization parameters for rate control, an improved basic unit layer rate control method for JVT-H017 is proposed. This paper presents a spatial-temporal correlation model, instead of the original linear one to predict the mean absolute difference of the basic unit. At the same time, according to the different complexity estimation of each macro-block in one basic unit, its quantization parameter can be amended adaptively. Experimental results show that the algorithm can avoid the process of updating the parameters and reduce the computational complexity, improve the quality of video encoding and increase the control precision of output rate.
Key words: rate control, basic unit layer, spatial-temporal correlation, adaptive bit allocation
中图分类号:
TN919.81
李伟;门佳. 基于空时相关性的基本单元层码率控制方案[J]. 计算机与现代化, 2013, 1(9): 126-129.
LI Wei;MEN Jia. Basic Unit Layer Rate Control Method Based on Spatial-temporal Correlation[J]. Computer and Modernization, 2013, 1(9): 126-129.
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链接本文: http://www.c-a-m.org.cn/CN/10.3969/j.issn.1006-2475.2013.09.031
http://www.c-a-m.org.cn/CN/Y2013/V1/I9/126
