#### Rate-distortion optimization-based intra encoder design = 율-왜곡 최적화 기술을 이용한 인트라 인코더 설계

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In this paper, we proposed a rate-distortion (R-D) optimization-based intra encoder for better R-D performance. To reduce the computational complexity of R-D optimization-based mode decision, we proposed two schemes; an early block type decision method and a rate estimation method for context-based adaptive variable length coding (CAVLC). Using the first method, we decided early the best block size for R-D optimization-based mode decision among luma 4×4, 8×8 and 16×16 block. The proposed method is used for R-D cost of a subblock (8×16 block) instead of that of macroblock (MB) with the proposed encoding order for the intra prediction of 4×4 and 8×8 block. The luma components of total R-D cost are only used for the mode decision without chroma components. The chroma components have small potion of total R-D cost of MB due to subsampling (4:2:0) and relatively small variance between chroma pixels. This method achieved the reduction of computational complexity with average 0.04dB PSNR degradation and rate increase of less than 1% compared with the full search method. The second method is based on replacing the CAVLC table for three key parameters, $\textit{Coefficient\_token}$, $\textit{Total\_zeros}$, and $\textit{Run\_before}$ into simple arithmetic expressions. Experimental results show that the proposed scheme reduced the encoding time by about 50% for full high definition and achieves almost the same PSNR at about 0.1% bit-rate increment compared with the JM reference software.
Kyung, Chong-Minresearcher경종민researcher
Description
한국과학기술원 : 전기및전자공학전공,
Publisher
한국과학기술원
Issue Date
2009
Identifier
327330/325007  / 020074143
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 전기및전자공학전공, 2009. 8., [ v, 26 p. ]

Keywords

H.264/AVC; Intra prediction; RDO; block type decision; rate estimation; H.264/AVC; 인트라 예측; 율왜곡최적화; 블럭 타입 결정; 율 예측; H.264/AVC; Intra prediction; RDO; block type decision; rate estimation; H.264/AVC; 인트라 예측; 율왜곡최적화; 블럭 타입 결정; 율 예측

URI
http://hdl.handle.net/10203/38780