Alternative Intra Prediction for Screen Content Coding in HEVC

Yangbin LIM  Si-Woong LEE  Haechul CHOI  

IEICE TRANSACTIONS on Information and Systems   Vol.E97-D   No.9   pp.2537-2540
Publication Date: 2014/09/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2013EDL8234
Type of Manuscript: LETTER
Category: Image Processing and Video Processing
intra prediction,  screen content coding,  HEVC,  

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Screen content generally consists of text, images, and videos variously generated or captured by computers and other electronic devices. For the purpose of coding such screen content, we introduce alternative intra prediction (AIP) modes based on the emerging high efficiency video coding (HEVC) standard. With text and graphics, edges are much sharper and a large number of corners exist. These properties make it difficult to predict blocks using a one-directional intra prediction mode. The proposed method provides two-directional prediction by combining the existing vertical and horizontal prediction modes. Experiments show that our AIP modes provide an average BD-rate reduction of 2.8% relative to HEVC for general screen contents, and a 0.04% reduction for natural contents.