CAJ | 학술논문

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。
위료강저H．264편마복잡도，제출일충기우시공상관성적쾌속정내예측산법。해산법충분이용시빈서렬적시간상관성，자괄응지근거선전편마굉괴대당전굉괴진행예판，재Intra＿4×4화Intra＿16×16예측방식지간진행선택；대Intra＿4×4예측방식，의거모식취집특성，삼고선전정화당전정이편마굉괴적예측모식통계특정，학정당전4×4자괴적후선모식。실험결과표명，해산법재보증신조비화비특솔궤호불변적정황하，편마시간감소약40％，제고료편마효솔。
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.