The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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A Wavelet-based Blind Watermarking Scheme Using Pixel Correlation of Low Sub-band

저주파 대역의 픽셀 상관도를 이용한 웨이블릿 기반 블라인드 워터마킹 기법

  • 유길상 (중앙대학교 첨단영상대학원 영상공학과 영상컨텐츠보호 연구실) ;
  • 장성갑 (중앙대학교 첨단영상대학원 영상예술학과) ;
  • 이원형 (중앙대학교 첨단영상대학원 영상공학과 영상컨텐츠보호 연구실)
  • Published : 2004.09.01
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Abstract

Most watermarking techniques embed watermarks in the middle frequency range for robustness and invisibility. In our proposed watermarking algorithms embed the gaussian sequence watermark into low frequency area of the wavelet transform domain because the histogram of low sub-band area is composed by similar coefficients. Also, our proposed scheme doesn't need the original image in extraction procedure The experimental results show good robustness against the Check Mark benchmarking tools.

현재까지 알려진 대부분의 워터마킹 기엽들은 여러 가지 공격에 대한 강인성과 워터마킹 된 영상의 비가시성을 동시에 만족하기 위하여 중간주파수 영역에 워터마킹을 삽입한다. 그러나 본 논문에서는 이산 웨이블릿 분해 연 영상의 저주파 대역에 가우시안 랜덤 시퀀스를 삽입함으로써 강인성을 높이고 화질 열화가 발생하는 계수에 대하여 워터마크 삽입을 생략함으로써 비가시성을 만족하도록 하였다 제안한 방식은 최저주파 대역의 이웃픽셀과의 상관도 계산에 의하여 워터마크를 삽입함으로써 추출 시에도 동일한 과정을 통하여 원 영상 없이도 워터마크를 검출할 수 있도록 하였다. 벤치마킹 도구를 통한 시뮬레이션 실험결과를 통해, 제시한 방법이 기존 연구와 비교하여 우수한 강인성을 보였다.

Keywords

References

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