Improved Lossless Comression Algorithm in HEVC

Abstract

The state-of-the-art video-coding standard is High Efficiency Video Coding (HEVC), which achieves significant compression performance relative to H.264/AVC. HEVC is designed for lossy compression, however, and it is not ideal for lossless compression. To overcome the limitations of conventional coding in HEVC, we focus on the improvement of entropy coding for lossless compression. In this method, entropy coding is modified based on the characteristics of residuals in a lossless environment. The experimental results show that the bit savings of the proposed entropy coding is 1.46% on average when compared to HEVC lossless coding. Modified entropy coding with block-based intra prediction shows a bit savings of 7.99% on average. We observe that the combination of intra prediction and entropy coding is effective in screen-contents sequences.