计算机技术与发展
計算機技術與髮展
계산궤기술여발전
COMPUTER TECHNOLOGY AND DEVELOPMENT
2013年
1期
83-86
,共4页
H. 264%帧内预测%自适应%相关性
H. 264%幀內預測%自適應%相關性
H. 264%정내예측%자괄응%상관성
H. 264%intra-frame prediction%adaptivity%correlation
为了满足实时应用的需求,有必要对 H.264帧内预测部分进行合理的优化.目前,研究人员对4*4亮度块所做的优化工作较多,而针对16*16亮度块和8*8色度块的优化并不常见.这里提出一种自适应帧内预测算法,该算法依据4*4亮度块,16*16亮度块以及8*8色度块最佳预测模式之间的相关性,根据16个4*4亮度块所选择的最佳预测模式来对16*16亮度块和8*8色度块的最佳预测模式进行快速预判.试验结果表明在几乎不影响编码质量的情况下,该算法以极小的计算量获得了显著的效率,可使16*16亮度块和8*8色度块最佳帧内预测模式选择的计算量分别下降65%和50%左右.
為瞭滿足實時應用的需求,有必要對 H.264幀內預測部分進行閤理的優化.目前,研究人員對4*4亮度塊所做的優化工作較多,而針對16*16亮度塊和8*8色度塊的優化併不常見.這裏提齣一種自適應幀內預測算法,該算法依據4*4亮度塊,16*16亮度塊以及8*8色度塊最佳預測模式之間的相關性,根據16箇4*4亮度塊所選擇的最佳預測模式來對16*16亮度塊和8*8色度塊的最佳預測模式進行快速預判.試驗結果錶明在幾乎不影響編碼質量的情況下,該算法以極小的計算量穫得瞭顯著的效率,可使16*16亮度塊和8*8色度塊最佳幀內預測模式選擇的計算量分彆下降65%和50%左右.
위료만족실시응용적수구,유필요대 H.264정내예측부분진행합리적우화.목전,연구인원대4*4량도괴소주적우화공작교다,이침대16*16량도괴화8*8색도괴적우화병불상견.저리제출일충자괄응정내예측산법,해산법의거4*4량도괴,16*16량도괴이급8*8색도괴최가예측모식지간적상관성,근거16개4*4량도괴소선택적최가예측모식래대16*16량도괴화8*8색도괴적최가예측모식진행쾌속예판.시험결과표명재궤호불영향편마질량적정황하,해산법이겁소적계산량획득료현저적효솔,가사16*16량도괴화8*8색도괴최가정내예측모식선택적계산량분별하강65%화50%좌우.
To meet the need of real-time application,a reasonable optimization on H. 264 intra prediction is essential. At present,research-ers have done lots of optimization work for 4*4 luminance block,but the efforts on 16*16 luminance block and 8*8 chroma block seems to be not so common. Based on the best prediction mode correlation between 4*4 luminance block,16*16 luminance block and 8* 8 chroma block,an adaptive algorithm was proposed. This algorithm can make fast mode decision for 16*16 luminance block and 8*8 chroma block according to the best modes that the sixteen 4*4 luminance blocks have selected. Experimental results demonstrate that the proposed algorithm obtains a remarkable efficiency with only a small amount of calculation. It makes the calculation for 16*16 lumi-nance block and 8*8 chroma block's optimal intra prediction mode selection drop respectively 65% and 50% ,almost having no effect on the coding quality.
