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Transactions Letters HEVC Lossless Coding and Improvements

By Minhua Zhou, Wen Gao, Minqiang Jiang and Haoping Yu


Abstract—The lossless coding mode of the High Efficiency Video Coding (HEVC) main profile that bypasses transform, quantization, and in-loop filters is described. Compared to the HEVC nonlossless coding mode with the smallest quantization parameter value (i.e., 0 for 8-b video and −12 for 10-b video), the HEVC lossless coding mode provides perfect fidelity and an average bit-rate reduction of 3.2%–13.2%. It also significantly outperforms the existing lossless compression solutions, such as JPEG2000 and JPEG-LS for images as well as 7-Zip and WinRAR for data archiving. To further improve the coding efficiency of the HEVC lossless mode, a sample-based angular intra prediction (SAP) method is presented. The SAP employs the same prediction mode signaling method and the sample interpolation method as the HEVC block-based angular prediction, but uses adjacent neighbors for better intra prediction accuracy and performs prediction sample by sample. The experimental results reveal that the SAP provides an additional bit-rate reduction of 1.8%–11.8 % on top of the HEVC lossless coding mode. Index Terms—Block-based angular intra prediction, High Efficiency Video Coding (HEVC), lossless coding, sample-based angular intra prediction (SAP). I

Year: 2013
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