基于时／空相关性的H．264帧内预测算法

ISCAS OpenIR

	基于时／空相关性的H．264帧内预测算法
其他题名	INTRA-FRAME PREDICTION ALGORITHM FOR H.264 BASED ON TEMPORAL AND SPATIAL CORRELATIONS
	陈霞; 赵军锁
	2014
发表期刊	计算机应用与软件
ISSN	1000-386X
卷号	31 期号:1 页码:197-200
摘要	为了降低H．264编码复杂度，提出一种基于时空相关性的快速帧内预测算法。该算法充分利用视频序列的时间相关性，自适应地根据先前编码宏块对当前宏块进行预判，在Intra＿4×4和Intra＿16×16预测方式之间进行选择；对Intra＿4×4预测方式，依据模式聚集特性，参考先前帧和当前帧已编码宏块的预测模式统计特征，确定当前4×4子块的候选模式。实验结果表明，该算法在保证信噪比和比特率几乎不变的情况下，编码时间减少约40％，提高了编码效率。 In order to reduce the encoding complexity in H.264,we propose a fast intra-frame prediction algorithm which is based on temporal and spatial correlations.Making full use of the advantage of temporal correlation of video sequence,the algorithm adaptively prejudges current macroblock according to previous coded macroblocks,and selects between the prediction approaches of Intra_4 ×4 and Intra_16 ×16;For Intra_4 ×4 prediction,it decides the candidate modes for current 4 ×4 sub-macroblock according to mode-gathering characteristic and referring the statistic characteristics of prediction mode of coded macroblocks in pre-frame and current frame.Experimental result shows that the algorithm reduces the encoding time by 40% with a neglectable PSNR change and bit rate increase,improves encoding efficiency.
收录类别	CSCD
其他摘要	In order to reduce the encoding complexity in H.264, we propose a fast intra-frame prediction algorithm which is based on temporal and spatial correlations. Making full use of the advantage of temporal correlation of video sequence, the algorithm adaptively prejudges current macroblock according to previous coded macroblocks, and selects between the prediction approaches of Intra_44 and Intra_1616; For Intra_44 prediction, it decides the candidate modes for current 44 sub-macroblock according to mode-gathering characteristic and referring the statistic characteristics of prediction mode of coded macroblocks in pre-frame and current frame. Experimental result shows that the algorithm reduces the encoding time by 40% with a neglectable PSNR change and bit rate increase, improves encoding efficiency.
关键词	H.264标准帧内预测编码复杂度时间/空间相关模式选择 H.264 Standard Intra-frame Prediction Coding Complexity Temporal And Spatial Correlations Mode Decision
部门归属	中国科学院软件研究所天基综合信息系统重点实验室北京 100190
语种	中文
内容类型	期刊论文
URI标识	http://ir.iscas.ac.cn/handle/311060/16779
专题	中国科学院软件研究所
推荐引用方式 GB/T 7714	陈霞,赵军锁. 基于时／空相关性的H．264帧内预测算法[J]. 计算机应用与软件,2014,31(1):197-200.
APA	陈霞,&赵军锁.(2014).基于时／空相关性的H．264帧内预测算法.计算机应用与软件,31(1),197-200.
MLA	陈霞,et al."基于时／空相关性的H．264帧内预测算法".计算机应用与软件 31.1(2014):197-200.