计算机工程与设计
計算機工程與設計
계산궤공정여설계
COMPUTER ENGINEERING AND DESIGN
2010年
7期
1526-1528,1532
,共4页
帧内预测%方向性%纹理%统计闽值%模式选择
幀內預測%方嚮性%紋理%統計閩值%模式選擇
정내예측%방향성%문리%통계민치%모식선택
intra prediction%directional%texture%statistical threshold%mode selection
为降低帧内预测的运算复杂度,根据不同的模式在宏块中出现概率的大小不同,在帧内4×4的亮度预测模式中,选取出现概率最大的5种预测模式,作为优先选择的预测模式.基于像素块的纹理特性,选择不具有方向性的直流模式通过阈值的设定来提前终止模式选择,通过提出的算式将4×4亮度块的候选模式从9种降低到1至4种,将16×16亮度块的候选模式从4种减少到1到3种.实验结果显示,在保证图像质量基本不变的情况下,该算法可节约12.26%到48.25%的编码时间,而码率只有微小的增加.
為降低幀內預測的運算複雜度,根據不同的模式在宏塊中齣現概率的大小不同,在幀內4×4的亮度預測模式中,選取齣現概率最大的5種預測模式,作為優先選擇的預測模式.基于像素塊的紋理特性,選擇不具有方嚮性的直流模式通過閾值的設定來提前終止模式選擇,通過提齣的算式將4×4亮度塊的候選模式從9種降低到1至4種,將16×16亮度塊的候選模式從4種減少到1到3種.實驗結果顯示,在保證圖像質量基本不變的情況下,該算法可節約12.26%到48.25%的編碼時間,而碼率隻有微小的增加.
위강저정내예측적운산복잡도,근거불동적모식재굉괴중출현개솔적대소불동,재정내4×4적량도예측모식중,선취출현개솔최대적5충예측모식,작위우선선택적예측모식.기우상소괴적문리특성,선택불구유방향성적직류모식통과역치적설정래제전종지모식선택,통과제출적산식장4×4량도괴적후선모식종9충강저도1지4충,장16×16량도괴적후선모식종4충감소도1도3충.실험결과현시,재보증도상질량기본불변적정황하,해산법가절약12.26%도48.25%적편마시간,이마솔지유미소적증가.
In order to reduce computational complexity of intra prediction, according to that different mode has different probability in macro-block, five prediction modes of luminance 4×4 modes are choosed as the preferential modes which have maximal probability. Choosing unidirectional direct current mode in advance through setting statistical threshold, to this which based on the feature of the block, and to this which based on the new equation, the number of candidate mode for luminance 4×4block is reduced from 9 to 1-4 and the number of candidate mode for luminance 16×16 block is reduced from 4 to 1 -3. The experimental result shows that the proposed method save 12.26% -48.25% computational load without degradation of the image quality negligible and increase a little bit-rate.
