Journal of the Korea Institute of Information Security & Cryptology (정보보호학회논문지)

Korea Institute of Information Security and Cryptology (한국정보보호학회)
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A Study on Optimizing Quantization Steps for QIM Watermarking Schemes

QIM 워터마킹 방식에서의 양자화 구간 간격 최적화에 관한 연구

  • Lee, Yun-Ho (Information Security Group, School of Information and Communication Engineering Sungkyunkwan University) ;
  • Lee, Kwang-Woo (Information Security Group, School of Information and Communication Engineering Sungkyunkwan University) ;
  • Kim, Seung-Joo (Information Security Group, School of Information and Communication Engineering Sungkyunkwan University) ;
  • Yang, Hyung-Kyu (Department of Computer & Media Engineering Kangnam University) ;
  • Won, Dong-Ho (Information Security Group, School of Information and Communication Engineering Sungkyunkwan University)
  • 이윤호 (성균관대학교 정보통신공학부 정보보호연구소) ;
  • 이광우 (성균관대학교 정보통신공학부 정보보호연구소) ;
  • 김승주 (성균관대학교 정보통신공학부 정보보호연구소) ;
  • 양형규 (강남대학교 컴퓨터미디어공학부) ;
  • 원동호 (성균관대학교 정보통신공학부 정보보호연구소)
  • Published : 2006.02.01
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Abstract

In this paper, we propose a method for enlarging quantization steps of a QIM watermarking scheme which determines the perceptual quality and robustness of the watermarked images. In general, increasing the quantization steps leads to good robustness but poor perceptual quality of watermarked images and vice versa. However, if we choose the quantization steps considering the expected quantization results as well as the original images, we can increase both robustness and perceptual quality of the watermarked images.

본 논문에서는 QIM(Quantization Index Modulation) 워터마킹 방식에서 워터마크 삽입 후의 이미지 품질과 워터마크의 강인성을 결정하는 양자화 구간 간격을 크게 하기 위한 방법을 제안한다. 일반적으로 양자화 구간 간격을 크게 할 경우, 삽입 강도는 높아지나 워터마크 삽입 후의 이미지 품질이 저하되며, 작게 하는 경우는 그 반대가 된다. 그러나 원본 이미지와 워터마크 삽입 후의 예상 결과를 이용하여 양자화 구간 간격을 결정하면 삽입 강도와 워터마크 삽입후의 이미지 품질을 모두 높일 수 있다.

Keywords

References

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