Improving the robustness of DCT-based image watermarking against JPEG compression

A DCT-based image watermarking technique is proposed in this article. To improve the robustness of watermark against JPEG compression, the most recently proposed techniques embed watermark into the low-frequency components of the image. However, these components hold significant information of the i...

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Bibliographic Details
Published in:Computer standards and interfaces 2010, Vol.32 (1), p.54-60
Main Authors: Lin, Shinfeng D., Shie, Shih-Chieh, Guo, J.Y.
Format: Article
Language:English
Subjects:
Compressing
Computer simulation
Image compression
Image watermarking
JPEG compression
JPEG encoders-decoders
Mathematical models
Robustness
Torus automorphism
Watermarking
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Summary:A DCT-based image watermarking technique is proposed in this article. To improve the robustness of watermark against JPEG compression, the most recently proposed techniques embed watermark into the low-frequency components of the image. However, these components hold significant information of the image. Directly replacing the low-frequency components with watermark may introduce undesirable degradation to image quality. To preserve acceptable visual quality for watermarked images, we propose a watermarking technique that adjusts the DCT low-frequency coefficients by the concept of mathematical remainder. Simulation results demonstrate that the embedded watermarks can be almost fully extracted from the JPEG-compressed images with very high compression ratios.
ISSN:0920-5489
1872-7018
DOI:10.1016/j.csi.2009.06.004