A New Repeating Color Watermarking Scheme Based on Human Visual Model
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A New Repeating Color Watermarking Scheme Based on Human Visual Model Chwei-Shyong Tsai Department of Management Information System, National Chung Hsing University, Taichung 402, Taiwan Email: [email protected]
Chin-Chen Chang Department of Computer Science and Information Engineering, National Chung Cheng University, Chiayi 621, Taiwan Email: [email protected] Received 26 November 2001; Revised 6 March 2004; Recommended for Publication by Yung-Chang Chen This paper proposes a human-visual-model-based scheme that effectively protects the intellectual copyright of digital images. In the proposed method, the theory of the visual secret sharing scheme is used to create a master watermark share and a secret watermark share. The watermark share is kept secret by the owner. The master watermark share is embedded into the host image to generate a watermarked image based on the human visual model. The proposed method conforms to all necessary conditions of an image watermarking technique. After the watermarked image is put under various attacks such as lossy compression, rotating, sharpening, blurring, and cropping, the experimental results show that the extracted digital watermark from the attacked watermarked images can still be robustly detected using the proposed method. Keywords and phrases: secret sharing, digital watermark, human visual model.
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INTRODUCTION
With the improvement of telecommunications, more and more people process, transmit, and store digital media via Internet. However, problems such as illegal use, tampering, and forgery occur that not only violate copyright laws but also do harm to the monetary profits of the copyright owners. Therefore, the protection of the intellectual property for digital media has become an important issue. Recently, digital watermarking has successfully provided the methods to guard the intellectual property rights of digital media, and some excellent research results have been published [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18]. To effectively protect the copyright of the digital images, a successful digital watermarking technique must possess the following four characteristics [17, 18]. (1) Watermarking must not reveal any hint of the digital watermark; that is, the watermarked image must not visually differ from the host image. This achieves the goal of invisible embedding. (2) The host image is unnecessary when verifying the copyright process that detects the watermark from watermarked image. This eliminates the complexity of the process and saves extra space for host image storage.
(3) Even if the embedding and verifying processes are known, unauthorized users still cannot remove and detect the digital watermark from the watermarked image, and this achieves the goal of secure embedding. (4) When purposely enhancing the quality of the watermarked image or when damage occurs so that the watermarked image may be processed by some kind of operation such as lossy JPEG compression, blurring, sharpening, rotating, and cropping, the copyright verificati
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