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Efficient intra mode decision for low complexity HEVC screen content compression


Autoři: Qiuwen Zhang aff001;  Yongbo Zhao aff001;  Weiwei Zhang aff001;  Lijun Sun aff002;  Rijian Su aff001
Působiště autorů: College of Computer and Communication Engineering, Zhengzhou University of Light Industry, Zhengzhou, Henan, China aff001;  School of Electrical Engineering, Henan University of Technology, Zhengzhou, Henan, China aff002
Vyšlo v časopise: PLoS ONE 14(12)
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pone.0226900

Souhrn

High efficiency video coding screen content coding (HEVC-SCC) extension is the latest HEVC development to improve the compression performance of screen content (SC) video. Similar to HEVC, the intra mode selection in HEVC-SCC is performed all the coding unit (CU) partitions to find the least rate distortion (RD) cost. Furthermore, additional intra tools are introduced to improve HEVC-SCC coding efficiency. However, these new tools could cause high computation complexity which restricts HEVC-SCC from ongoing applications. To solve the problem, an efficient intra mode decision for HEVC-SCC that adaptively utilizes the texture complexity of SC treeblock is proposed. The texture complexity of a SC treeblock is first analyzed according to the variation degree of the luminance value. And then, two efficient approaches are proposed based on the constructed model, which are early CU depth level determination and adaptive intra mode selection. Experimental results demonstrate that the proposed method can save 48.5% encoder runtime while keeping nearly the same coding efficiency as the HEVC-SCC encoders.

Klíčová slova:

Algorithms – Decision trees – Luminance – Machine learning algorithms – Sequence analysis – Signal processing – Simulation and modeling – Video compression


Zdroje

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