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SATD Based Chroma Mode Decision for Intra Picture in HEVC Range Extensions
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- Authors
- Jongho Kim, Sung-Chang Lim, Sukhee Cho, Hui-Yong Kim
- Issue Date
- 2015-01
- Citation
- International Workshop on Advanced Image Technology (IWAIT) 2015, pp.1-3
- Language
- English
- Type
- Conference Paper
- Abstract
- HEVC range extensions (RExt) is the extension model of HEVC to support various bit-depth and color formats. Especially, the coding tools have adopted for supporting the various color formats and it brings increasing of computational complexity. In this paper, we proposed the sum of absolute transformed differences (SATD) based chroma mode decision method to reduce the computational complexity due to extended color format. The proposed method determines the number of candidate chroma prediction modes based on SATD cost of the each chroma prediction modes. The chroma mode decision process of the prediction modes which have large SATD cost are skipped. We also propose the candidate prediction modes reduction method. It is based on correlations of prediction mode between block in lower depth and its divided blocks in higher depth. The number of selected candidate prediction modes by SATD based mode decision can be minimizing according to the prediction mode of block in lower depth.Experimental results show that the proposed method reduces the computational complexity with negligible loss of quality.
- KSP Keywords
- Coding Tools, Computational complexity, Loss of quality, Mode decision, Prediction mode, Range Extensions, Reduction method, Sum of Absolute Transformed Differences(SATD), bit depth, decision method, decision process