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Download Digital Watermarking: Second International Workshop, IWDW by Fernando Pérez-González (auth.), Ton Kalker, Ingemar Cox, PDF

By Fernando Pérez-González (auth.), Ton Kalker, Ingemar Cox, Yong Man Ro (eds.)

We are satisfied to offer to you the complaints of the 2d foreign Workshop on electronic Watermarking, IWDW 2003. given that its smooth re-appearance within the educational group within the early Nineties, nice development has been made in figuring out either the features and the weaknesses of electronic watermarking. at the theoretical aspect, all of us are actually good conscious of the truth that electronic waterma- ing is better seen as a kind of conversation utilizing part info. when it comes to electronic watermarking the aspect info in query is the rfile to be wat- marked. This perception has resulted in a greater knowing of the boundaries of the ability and robustness of electronic watermarking algorithms. It has additionally resulted in new and greater watermarking algorithms, either when it comes to ability and imperceptibility. equally, the function of human belief, and types thereof, has been enormously more advantageous within the learn and layout of electronic watermarking algorithms and platforms. at the useful part, functions of watermarking aren't but considerable. the unique euphoria at the function of electronic watermarking in replica safety and copyright prot- tion has no longer led to common utilization in useful structures. With hindsight, a n- ber of purposes may be given for this loss of functional applications.

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Extra resources for Digital Watermarking: Second International Workshop, IWDW 2003, Seoul, Korea, October 20-22, 2003. Revised Papers

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Such distortions form a communication channel across which the watermark must carry information. While it is possible to design watermarks that are robust to a wide variety of distortions, robustness to each distortion must necessarily come at some cost in payload and fidelity. Thus, depending on the application, we might want less robustness against some unlikely distortions, in exchange for more embedded information or better fidelity. If we want a single watermarking system that can be used in a wide variety of applications, then we want a system that can be somehow tailored to each given channel.

L. Miller The results in Section 6 show that the system is sometimes quite sensitive to differences between the channel model used during embedding and the distortions applied before detection. This raises the possibility of using systems like this for semi-fragile or telltale watermarks. Can we explicitly tailor watermarks to be robust against one black-box model, but fragile against another? Finally, the type of embedding function proposed here might have theoretical implications for channel capacity.

Watermark Embedding for Black-Box Channels 33 Fig. 10. A case in which two copies of an image, both watermarked with the same message, same key, and essentially the same fidelity, but each watermarked using a different channel model, yield qualitatively different robustness. 04dB. 06dB. 1). 41). L. Miller The results in Section 6 show that the system is sometimes quite sensitive to differences between the channel model used during embedding and the distortions applied before detection. This raises the possibility of using systems like this for semi-fragile or telltale watermarks.

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