Journal of Broadcast Engineering (방송공학회논문지)

The Korean Institute of Broadcast and Media Engineers (한국방송∙미디어공학회)
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The Reduction of Blocky Artifacts in Conditional Replenishment Algorithm for SC-MMH 3DTV Systems

융합형 3DTV를 위한 조건부대체 알고리즘에서의 블록화 현상 제거

  • 김지원 (국민대학교 전자공학과) ;
  • 김성훈 (한국전자통신연구원 영상미디어연구실) ;
  • 김휘용 (한국전자통신연구원 영상미디어연구실) ;
  • 김기두 (국민대학교 전자공학과) ;
  • 정경훈 (국민대학교 전자공학과)
  • Received : 2016.06.21
  • Accepted : 2016.10.20
  • Published : 2017.01.30
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Abstract

CRA(Conditional Replenishment Algorithm) was proposed to improve the visual quality of SC-MMH(Service Compatible 3DTV using Main and Mobile Hybrid delivery) which is a kind of hybrid 3DTV system and has been standardized by ATSC. In SC-MMH system, reference view and additional view may have different resolutions and/or encoding methods. To reconstruct 3D view, additional view needs to be enlarged as same as reference view. Although the performance of CRA is quite satisfactory, there may exist some blocky artifacts in the enlarged view since it adopts block-shaped processing unit with quad-tree structure. In this paper, we analyze the main causes of blocky artifacts in CRA and show these artifacts can be successfully suppressed by applying the deblocking filter at receiver side.

조건부대체 알고리즘은 ATSC의 융합형 3DTV 표준인 SC-MMH 시스템의 화질을 개선하는 방법으로서 ATSC에 의해서 표준화되었다. SC-MMH 시스템에서는 양안식 스테레오 영상을 구성하는 기준영상과 부가영상의 해상도 및 부호화 방식이 서로 다르게 정해진다. 3D 영상을 합성하기 위해 해상도가 낮은 부가영상을 확장함에 있어서 조건부대체 알고리즘을 적용하면 약간의 부가 정보를 추가함으로써 3D 영상의 화질이 대폭 개선된다. 이 과정에서 부가 정보는 쿼드트리 구조의 가변 크기 블록 단위로 처리되기 때문에 확장된 부가영상에는 시각적으로 거슬리는 블록화 현상이 발생할 수 있다. 본 논문에서는 SC-MMH 시스템의 수신기 측면에서 조건부대체 알고리즘에 의한 블록화 현상이 발생하는 경우를 분석하고 가변크기의 블록에 사용가능한 디블록킹 필터를 적용함으로써 블록화 현상을 효과적으로 억제할 수 있음을 실험을 통해 검증하였다.

Keywords

References

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