高性能視頻編碼幀間預(yù)測的單元劃分優(yōu)化算法
doi: 10.11999/JEIT150843
基金項目:
國家自然科學(xué)基金(60902101)，教育部新世紀(jì)優(yōu)秀人才計劃(NCET-11-0824)，中央高?；究蒲袠I(yè)務(wù)費專項資金(3102014JCQ01057)
An Effective CU Splitting Algorithm in Inter Prediction of HEVC
Funds:
The National Natural Science Foundation of China (60902101), New Century Excellent Talents in University (NCET-11-0824), The Fundamental Research Funds for the Central Universities (3102014JCQ01057)
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摘要: 新一代的高性能視頻編碼(HEVC)通過應(yīng)用各種先進技術(shù)來大幅提高視頻編碼的性能，然而，這些方法也大大增加了整個編碼過程，尤其是預(yù)測編碼階段的計算復(fù)雜度。該文提出一種應(yīng)用于高性能視頻編碼幀間預(yù)測的快速單元劃分算法。該算法基于HEVC靈活的四叉樹結(jié)構(gòu)，根據(jù)被編碼單元的運動特性來確定所編碼信息的閾值，并以此作為單元劃分的提前終止條件，從而減少了不必要的單元劃分操作和率失真代價的相關(guān)計算，達到節(jié)省編碼時間和降低編碼復(fù)雜度的目的。實驗結(jié)果表明，在峰值信噪比(PSNR)損失僅為0.0418 dB的情況下，所提算法可以平均降低46.1%的編碼時間。Abstract: High Efficiency Video Coding (HEVC) provides better compression performance by adopting many new techniques. However these tools also increase the computational complexity of the prediction, which consumes most of encoder computations. This paper proposes an effective splitting algorithm in inter prediction of HEVC. Based on the motion homogeneity of coding unit, a certain threshold is used to decide whether the coding unit should be split into smaller ones. So the unnecessary calculation decreases rapidly. By skipping some specific sub-CUs, the coding complexity is dramatically improved. Experimental results show that the proposed technique can save 46.1% coding time in average with negligible loss of coding efficiency, and the decrease of PSNR is only 0.0418 dB.
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