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

Authors:
Shinfeng D. Lin;Shih-Chieh Shie;J. Y. Guo
Affiliations:
Department of Computer Science and Information Engineering, National Dong Hwa University, Hualien County, Taiwan, ROC;Department of Computer Science and Information Engineering, National Formosa University, 64 Wen-Hua Road, Hu-Wei, Yunlin County 632, Taiwan, ROC;Department of Computer Science and Information Engineering, National Dong Hwa University, Hualien County, Taiwan, ROC
Venue:
Computer Standards & Interfaces
Year:
2010

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Abstract

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.