A Method for Deciding Quantization Steps in QIM Watermarking Schemes

  • Yunho Lee
  • Kwangwoo Lee
  • Seungjoo Kim
  • Dongho Won
  • Hyungkyu Yang
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 3823)

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.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2005

Authors and Affiliations

  • Yunho Lee
    • 1
  • Kwangwoo Lee
    • 1
  • Seungjoo Kim
    • 1
  • Dongho Won
    • 1
  • Hyungkyu Yang
    • 2
  1. 1.Information Security GroupSungkyunkwan UniversitySuwon-si, Gyeonggi-doKorea
  2. 2.Department of Computer & Media EngineeringKangnam UniversityYongin-si, Gyeonggi-doKorea

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