Chaotic system and QR factorization based robust digital image watermarking algorithm |
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Authors: | SONG Wei HOU Jian-jun LI Zhao-hong HUANG Liang |
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Affiliation: | (1) Department of Electrical and Computer Engineering, University of Windsor, Windsor, ON, Canada, N9C 1M2;(2) Department of Mathematics, Indian Institute of Technology Roorkee, Roorkee, 247 667, India |
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Abstract: | In order to protect copyright of digital images, a new robust digital image watermarking algorithm based on chaotic system
and QR factorization was proposed. The host images were firstly divided into blocks with same size, then QR factorization
was performed on each block. Pseudorandom circular chain (PCC) generated by logistic mapping (LM) was applied to select the
embedding blocks for enhancing the security of the scheme. The first column coefficients in Q matrix of chosen blocks were modified to embed watermarks without causing noticeable artifacts. Watermark extraction procedure
was performed without the original cover image. The experimental results demonstrate that the watermarked images have good
visual quality and this scheme is better than the existing techniques, especially when the image is attacked by cropping,
noise pollution and so on. Analysis and discussion on robustness and security issues were also presented. |
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Keywords: | digital watermarking QR factorization pseudorandom circular chain logistic mapping |
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