H.265/HEVC(High Efficiency Video Coding)에서는 하드웨어 비디오 인코더의 처리율(Throughput)을 높이기 위하여 동일 CU(Coding Unit) 내 PU(Prediction Unit)들이 병렬로 머지 후보 리스트를 생성할 수 있는 병렬 머지 방법이 표준 기술로 사용되고 있다. 하지만 이 방법은 동일 CU 내의 PU 간의 의존성만 제거할 수 있고 코딩 순서상의 이전 CU 와의 의존성은 제거할 수 없다. 결국 이전 CU 의 모드 결정 과정이 완료된 후에 현재 CU 내의 PU 가 머지 후보 리스트를 생성할 수 있기 때문에 높은 처리율 향상을 기대할 수 없다. 또한 CU 내의 대부분의 PU 들이 가장 인접한 MV(Motion Vector)를 머지 후보로 사용하지 못하여 압축 효율에 대한 손실도 크다. 본 논문에서는 이전 CU 와의 의존성을 제거함으로써 높은 처리율을 갖으면서 압축 효율에 대한 손실을 최소화할 수 있는 개선된 병렬 머지 방법을 제안한다. 실험 결과, 제안된 방법은 기존 병렬 머지 방법 대비 동일 화질에서 평균 약 1.8%의 압축률이 향상되는 것으로 나타났다.
KSP Keywords
Coding unit(CU), Motion Vector(MV), high efficiency video coding, prediction unit
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