H. 264 /AVC幀內(nèi)預(yù)測模式選擇算法研究
裴世保,李厚強,俞能海
摘　要: H. 264 /AVC采用空間域上的幀內(nèi)預(yù)測技術(shù),進一步提高了編碼效率,但由于H. 264 /
AVC支持的幀內(nèi)預(yù)測模式數(shù)較多,使預(yù)測的復(fù)雜度大幅度增加。詳細(xì)分析了幀內(nèi)預(yù)測模式的選擇過
程,提出一種快速的率失真優(yōu)化(RDO)模式下的快速Intra_4 ×4模式選擇算法,該算法根據(jù)SATD
( Sum of Absolute Transformed Difference)以及相鄰塊的預(yù)測模式之間的相關(guān)性等特征,預(yù)先排除了超
過65%可能性小的Intra_4 ×4模式,避免了不必要的計算,從而大幅度降低幀內(nèi)預(yù)測的復(fù)雜度,同時
基本保持了H. 264 /AVC的編碼性能。
關(guān)鍵詞:視頻編碼;幀內(nèi)預(yù)測;率失真優(yōu)化
中圖分類號: TP317. 4; TN919. 8　　文獻標(biāo)識碼: A
Research of H. 264 /AVC intra2pred iction mode selection a lgor ithm
PE I Shi2bao,L IHou2qiang, YU Neng2hai
(Departm ent of Electronic Engineering and Inform ation Science, University of Science and Technology of China,
Hefei Anhui 230026, China)
Abstract: H. 264 /AVC emp loyed intra2p rediction technique in space domain to enhance coding efficiency, but it
increased p rediction comp lexity drastically because of quite a few intra2p rediction modes. A new Intra_4 ×4 mode selection
algorithm based on rate distortion op timization (RDO ) was p roposed. It emp loyed SATD ( Sum of Absolute Transform
Difference) of each block as a judgment and used correlation between p rediction modes of adjacent blocks to filter out more
than 65% less p robable modes beforehand so as to avoid unnecessary computations. The new algorithm reduces the intra2
p rediction comp lexity greatly while maintaining coding performance very well.
Key words: video coding; intra2p rediction; RDO (Rate Distortion Op timization)