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Robust copyright protection scheme based on discrete cosine transform and secret sharing techniques

[+] Author Affiliations
Ming-Shi Wang

National Cheng Kung University, Department of Engineering Science, Tainan 701, Taiwan

Wei-Che Chen

National Cheng Kung University, Department of Engineering Science, Tainan 701, Taiwan

J. Electron. Imaging. 17(2), 023006 (April 30, 2008). doi:10.1117/1.2912065
History: Received April 17, 2007; Revised November 05, 2007; Accepted November 29, 2007; Published April 30, 2008
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This paper presents a robust copyright protection scheme based on discrete cosine transform (DCT) and secret sharing techniques. The scheme cannot only use a binary image of arbitrary size as the watermark, but also generate shares without the need of a codebook. The scheme first performs the DCT on a host image to obtain the image features and uses these features to generate a master share. The master share and a binary watermark are then used to generate an ownership share, according to the secret sharing technique. The hidden watermark, used for copyright verification, can be revealed by combining the master share with the ownership share. It is shown that the hidden watermark can be effectively revealed by the proposed scheme, even if the visual quality of protected images has been greatly degraded. Moreover, the proposed scheme achieves superior resistance to several image processing operations, compared with existing schemes.

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Citation

Ming-Shi Wang and Wei-Che Chen
"Robust copyright protection scheme based on discrete cosine transform and secret sharing techniques", J. Electron. Imaging. 17(2), 023006 (April 30, 2008). ; http://dx.doi.org/10.1117/1.2912065


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