Journal of the Korea Convergence Society (한국융합학회논문지)

Korea Convergence Society (한국융합학회)
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An Advanced Watermarking Algorithm with Reversibility

개선된 가역 워터마킹 알고리즘

  • Jung, Soo-Mok (Division of Computer Science & Engineering, Sahmyook University)
  • 정수목 (삼육대학교 컴퓨터.메카트로닉스공학부)
  • Received : 2017.12.13
  • Accepted : 2018.02.20
  • Published : 2018.02.28
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Abstract

In this paper, an efficient reversible watermarking algorithm is proposed. By using the proposed algorithm, it is possible to increase the amount of copyright-related information to be embedded in cover image. Depending on the spatial locality and surface characteristics, it is possible to precisely predict the pixel value using neighboring pixels. If the predicted pixel value almost the same as the pixel value of the cover image, the differential value between the predicted pixel value and the pixel value of cover image is very small. So, the frequency is increased greatly at the peak point of histogram of difference sequence. Thus, it is possible to increase greatly the amount of secret data to be embedded in cover image. The experimental results show that the proposed watermarking algorithm is superior to the previous algorithms.

본 논문에서는 효율적인 가역 워터마킹 알고리즘을 제안하였다. 제안된 기법을 사용하여, 커버 이미지에 은닉할 수 있는 저작권관련 정보의 양을 증가시킬 수 있다. 공간적 지역성과 표면 특성에 따라, 주변 픽셀들을 사용하여 픽셀 값을 정밀하게 예측할 수 있다. 예측된 픽셀 값과 커버 이미지의 원본 픽셀 값이 거의 같게 되면, 커버 이미지의 원본 픽셀 값과 예측 픽셀 값의 차이가 매우 적게 된다. 그러므로 차분 시퀀스에 대한 히스토그램의 피크 포인트에서의 빈도수가 크게 증가하게 된다. 따라서 커버 이미지에 은닉할 수 있는 기밀 데이터의 양이 크게 증가하게 된다. 실험 결과를 통하여 제안된 워터마킹 알고리즘이 기존의 알고리즘보다 우수함을 확인 할 수 있다.

Keywords

References

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