Practical Challenges for Digital Watermarking Applications
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ractical Challenges for Digital Watermarking Applications Ravi K. Sharma Digimarc Corporation, 19801 SW 72nd Avenue Suite 100, Tualatin, OR 97062, USA Email: [email protected]
Steve Decker Digimarc Corporation, 19801 SW 72nd Avenue Suite 100, Tualatin, OR 97062, USA Email: [email protected] Received 29 November 2001 The field of digital watermarking has recently seen numerous articles covering novel techniques, theoretical studies, attacks, and analysis. In this paper, we focus on an emerging application to highlight practical challenges for digital watermarking applications. Challenges include design considerations, requirements analysis, choice of watermarking techniques, speed, robustness, and the tradeoffs involved. We describe common attributes of watermarking systems and discuss the challenges in developing real world applications. Our application uses digital watermarking to connect ordinary toys to the digital world. The application captures important aspects of watermarking systems and illustrates some of the design issues faced. Keywords and phrases: digital watermarking, spread spectrum watermarking, challenges for watermarking, watermarking tradeoffs, repetition code, smart toys, connected content.
1. INTRODUCTION Digital watermarking provides a way to imperceptibly embed digital information into both digital (images, video, audio) and conventional (printed material) media content. Information contained within the watermark can be used to add value to a variety of applications [1] such as security, content protection, copy prevention, transaction monitoring, authentication [2], and so forth. A unique advantage of a digital watermark is that the information is imperceptibly bound to the original (cover or host) medium. An emerging application of digital watermarking is that of connected content. In this application, traditional analog media such as printed content [3] are connected to the digital world using embedded digital watermarks. In this paper, we describe a novel connected content application, Smart Toy. In the Smart Toy concept, the play value of ordinary toys is enhanced using digital watermarks. The watermark transforms the toy into an extraordinary object. The watermark acts as an instrument to connect the toy (a real world object) to a digital entity (such as a computer or the Internet). Detecting the watermark is akin to recognizing the object. The digital entity can invoke a multitude of responses on recognizing the object. The field of digital watermarking is characterized by active
research, with numerous articles covering new techniques, theory, various attacks on watermarking techniques, robustness, and analysis. Given that the field is maturing rapidly, there needs to be at least an equal, if not greater, emphasis on the practical aspects of developing real-world watermarking applications. In this article, we focus on the Smart Toy application to highlight practical challenges for watermarking applications. Which watermarking technique to use? How to achieve a specific detection r
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