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- W2463677331 startingPage "341" @default.
- W2463677331 abstract "HEVC 표준은 기존의 H.264 표준을 대체할 차세대 고효율 영상 압축 코덱이다. H.264 표준에 비해 약 50% 수준으로 비트레이트를 감소시켰지만 계산 복잡도는 약 1.4배 정도 증가하였다. 계산 복잡도를 낮추기 위해 다양한 고속화 알고리즘들이 제안되어 왔다. 인트라 코딩에는 rough mode decision(RMD) 기법이 적용되었다. 최적의 모드를 선정하기 위한 rate-distortion optimization (RDO) 과정은 복잡도가 높기 때문에 RMD를 사용하여 더 간소화된 방법으로 RDO 단계를 위한 후보 모드들을 선정한다. 그러나 큰 사이즈의 블록들의 경우 RMD 과정 역시 계산 복잡도를 줄일 필요가 있다. 본 논문에서는 RMD 과정에서 참조 픽셀을 가져오고, 예측 픽셀 생성하는 과정에서 다운 샘플링을 적용하였으며 참조 소프트웨어에 적용된 기존 RMD 방식에 비해 계산량을 70%가량 줄일 수 있었다. 이때 BDBR 증가는 0.04%로 미미한 수준이다. 제안한 다운샘플링 기법을 RMD 하드웨어에 적용하면 게이트 카운트는 약 33%, 버퍼의 크기는 약 66% 줄어든다. HEVC is the next compression standard and is expected to be used widely replacing the conventional H.264/AVC standard. The compression ratio of the HEVC is twice times than H.264/AVC, whereas its computational complexity is increased by up to 40%. Many research efforts have been made to reduce the computational complexity and to speed up encoding. For intra coding, the rough mode decision (RMD) is commonly applied. The rate-distortion optimization (RDO) process to decide the best mode is too complex so that RMD chooses the candidate modes with a simple process and sends the candidates to RDO process. However, for large-size blocks, the RMD also requires considerable computations. In this paper, a down-sampling scheme is proposed for the RMD process. The reference pixel loading, predicted pixel generation are performed using the down-sampled pixel data. When the proposed scheme is applied to the RMD, the computational complexity is reduced by 70% with a marginal bitrate increase of 0.04%. In terms of area of hardware-based RMD, the gate count and the buffer size is reduced 33% and 66%, respectively." @default.
- W2463677331 created "2016-07-22" @default.
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- W2463677331 date "2016-05-30" @default.
- W2463677331 modified "2023-10-17" @default.
- W2463677331 title "Down Sampling for Fast Rough Mode Decision for a Hardware-based HEVC Intra-frame encoder" @default.
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- W2463677331 doi "https://doi.org/10.5909/jbe.2016.21.3.341" @default.
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