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

The Institute of Electronics and Information Engineers (대한전자공학회)
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PSADT(Polar Coordinates Shape Adaptive Discrete Transform) Based Watermarking Scheme for Arbitrary Shape Object

임의의 모양을 가지는 영상 객체에 적용 가능한 극좌표계 모양적응 이산변환(PSADT : Polar Coordinates Shape Adaptive Discrete Transform)에 기반한 워터마킹 기법

  • Go, Yun-Ho (Dept. of Electronic Computer Science, Korea Advanced Institute of Science and Technology) ;
  • Yun, Byeong-Ju (Dept. of Electronic Computer Science, Korea Advanced Institute of Science and Technology) ;
  • Lee, Hun-Cheol (Dept. of Electronic Computer Science, Korea Advanced Institute of Science and Technology) ;
  • Kim, Seung-Dae (Dept. of Electronic Computer Science, Korea Advanced Institute of Science and Technology) ;
  • Yu, Sang-Jo
  • 고윤호 (한국과학기술원 전자전산학과) ;
  • 윤병주 (한국과학기술원 전자전산학과) ;
  • 이훈철 (한국과학기술원 전자전산학과) ;
  • 김승대 (한국과학기술원 전자전산학과) ;
  • 유상조 (인하대학교 정보통신 전문대학원)
  • Published : 2002.03.01
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Abstract

In this paper, we propose a new image-watermarking scheme lot arbitrarily shaped object based on Polar coordinates Shape Adaptive Discrete Transform (PSADT). Using log-polar coordinates conversion and shape adaptive discrete transform, the proposed watermarking method can be applied to any arbitrarily shaped image-object such as MPEG-4 VOP and is much more robust to geometrical attacks such as rotation and scaling than the conventional methods.

본 논문에서는 임의의 모양을 가지는 영상 객체(image object)에 적용 가능한 모양적응 이산변환(PSADT : Polar coordinates shape adaptive discrete transform)에 기반한 새로운 워터마킹 기법을 제안한다. 대수-극 좌표계(log-polar coordinates)와 모양적응 이산변환을 이용하여 제안된 기법은 MPEC-4의 VOP와 같은 임의의 모양을 가지는 영상 객체에 적용할 수 있을 뿐만 아니라 기존 기법에 비하여 회전과 크기 변화와 같은 기하학적인 공격에 대하여 우수한 강인성을 제공한다.

Keywords

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