HEVC(High Efficiency Video Coding) 보다 뛰어난 압축 성능을 갖는 차세대 비디오 부호화 표준 후보 기술에 대한 탐색과 검증을 진행한 JVET(Joint Video Exploration Team)은 기술 검증을 위한 참조 SW 코덱인 JEM(Joint Exploration Model)을 공개하였다. JEM은 HEVC의 35개 보다 증가한 67개의 화면내 예측 모드를 사용하고 있으며, 이에 따른 예측 모드 부호화에 대한 부담으로 부호화 성능 개선에 제한이 따른다. 본 논문에서는 화면내 예측 모드의 선택 확률을 분석하고, 이를 바탕으로 보다 효율적인 화면내 예측 모드 부호화 기법과 그 기법의 효율적인 엔트로피 부호화를 위한 문맥 모델링 기법을 제안한다. 실험결과 제안 기법은 AI(All Intra) 부호화 구조에서 JEM 7.0 대비 0.02%의 BD-rate 이득을 보였으며, 향후 추가적인 성능 향상을 위한 문맥 모델링 최적화에 대한 연구가 필요하다.
KSP Keywords
High Efficiency Video coding(HEVC), Video exploration
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