Novel robust image watermarking using difference correlation detector

Authors:
Wei Lu;Hongtao Lu;Fu-Lai Chung
Affiliations:
Department of Computer Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China and Department of Computing, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;Department of Computer Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China;Department of Computing, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
Venue:
Computer Standards & Interfaces
Year:
2007

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Abstract

This paper presents a robust digital image watermarking scheme based on subsampling and difference correlation. Four subimages are obtained from the host image by subsampling. A binary watermark is bit-wisely embedded in the DCT domain of two of the subimages selected by a secret key. The watermark is detected using coefficient difference correlation and does not need the original image. Since the subimages are highly correlated with each other, the proposed difference correlation detector has a better performance than a common coefficient correlation detection. Experimental results show good robustness of the proposed scheme.