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http://dx.doi.org/10.13089/JKIISC.2006.16.1.45

A Study on Optimizing Quantization Steps for QIM Watermarking Schemes  

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)
Publication Information
Journal of the Korea Institute of Information Security & Cryptology / v.16, no.1, 2006 , pp. 45-53 More about this Journal
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.
Keywords
QIM; Watermarking;
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