ABSTRACT

Professor Irwin King

Department of Computer Science & Engineering

The Chinese University of Hong Kong

A Short Summary of Digital Watermarking Techniques for Multimedia Data

The growth of networked multimedia systems has created the need for the copyright protection of various digital medium, eg, images, audio clips, video, etc. Copyright protection involves the authentication of ownership and the identification of illegal copies of a (possibly forged) image. One approach used to address this problem is to add a visible or invisible structure to an image that can be used to seal or mark it. These structures are known as digital watermarks. The watermark is capable of carrying such information as authentication or authorization codes, or a legend essential for image interpretation. This capability is envisaged to find application in image tagging, copyright enforcement, counterfeit protection, and controlled access. In this paper, we first outline the desirable characteristics of digital watermarks. Previous work in digital watermarking is then summarized. Several recent approaches that address these issues are also discussed.

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