Efficient intra mode decision for low complexity HEVC screen content compression

• Published in: PloS one Vol. 14; no. 12; p. e0226900
• Main Authors: Zhang, Qiuwen, Zhao, Yongbo, Zhang, Weiwei, Sun, Lijun, Su, Rijian
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 31.12.2019; Public Library of Science (PLoS)
• Subjects: Algorithms; Analysis; Coders; Coding; Communication; Complexity; Compression; Computer and Information Sciences; Copper; Data Compression - methods; Decision Theory; Efficiency; Engineering; Engineering and Technology; Image coding; Methods; Modal choice; Physical Sciences; Research and Analysis Methods; Texture; Video compression; Video Recording - methods; Wireless Technology; China
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0226900

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.