본 논문에서는 화면내 예측의 계산 복잡도를 감소시키기 위한 방법을 제안한다. HM2.0 의 화면내 예측방법인 각도에 의한 예측(Angular prediction)은 예측 대상블록 내부의 각 샘플이 예측하기 위해 사용하는 참조샘플로부터 정수단위의 위치에 있지 않을 경우 참조 샘플들을 보간 하여 예측을 수행한다. 이러한 방법은 예측 대상 블록의 크기가 커질수록 보간 하는 횟수가 증가하고 계산 복잡도가 증가하는 단점이 있다. 제안하는 방법은 한번의 보간으로 복수의 샘플들을 예측함으로써 보간 횟수를 줄이고 결과적으로 계산의 복잡도를 줄인다. PU_32x32 에 대해 제안하는 방법을 적용하였을 경우, 보간하는 횟수는 HM2.0 대비 1/2 배 또는 1/4 배 가까이 감소하고 성능 저하는 High-Efficiency(HE)에서 0.1% 또는 0.2% 정도로 미미하게 나타났다.
KSP Keywords
high efficiency
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