Journal of the Institute of Electronics Engineers of Korea SP (대한전자공학회논문지SP)

The Institute of Electronics and Information Engineers (대한전자공학회)
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A New Fast Transcoder for Resizing Coded Video Sequences

부호화된 영상의 크기를 변환하는 새로운 고속 트랜스코더

  • Park, Il-Woo (School of Electronics and Telecommunicatios Kwang Woon University) ;
  • Cho, Yong-Gook (School of Electronics and Telecommunicatios Kwang Woon University) ;
  • Myung, Jin-Su (School of Electronics and Telecommunicatios Kwang Woon University) ;
  • Chae, Byung-Jo (School of Electronics and Telecommunicatios Kwang Woon University) ;
  • Oh, Seoung-Jun (School of Electronics and Telecommunicatios Kwang Woon University) ;
  • Yang, Chang-Mo (Korea Electronic Technology Institute) ;
  • Cho, We-Duke (Korea Electronic Technology Institute)
  • Published : 2002.11.01
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Abstract

Recently, many advanced video application services over the mobile wireless networks have required a transcoder which can efficiently reduce the size of compressed video bitstreams. The transcoder can be worked in either the spatial domain or the DCT domain. In this paper, we propose a new fast hybrid-type transcoder which can efficiently reduce the frame size with keeping the visual quality. The proposed scheme consists of two major processes: a transform domain process and a spatial domain process. We also propose a scheme for coding mode selection and motion vector refinement. Experimental results show that our approach can reduce the computational complexity more than any other conventional spatial-domain transcoder with keeping the visual quality.

최근 이동 무선망을 통한 발전된 비디오 응용 서비스에서 비디오 스트림의 크기를 효과적으로 줄이는 트랜스코더가 필요로 하게 되었다. 이러한 트랜스코더는 화소공간뿐만 아니라 DCT 공간상에서도 가능하다. 본 논문에서는 화소공간과 DCT 공간을 활용하여 시각적 화질을 유지하면서 영상 크기를 효과적으로 줄이는 새로운 고속 복합 트랜스코더를 제안하였다. 또한 부호화 모드 결정과 움직임 벡터 재산출 방법을 제안하였다. 대표적인 실험용 비디오 시퀀스에 적용하였을 때 기존의 공간영역 트랜스코딩 방법과 유사한 시각적 화질을 유지하면서도 계산량을 감소시킬 수 있었다.

Keywords

References

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