TAILIEUCHUNG - Báo cáo hóa học: " Facilitating Watermark Insertion by Preprocessing Media"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Facilitating Watermark Insertion by Preprocessing Media | EURASIP Journal on Applied Signal Processing 2004 14 2081-2092 2004 Hindawi Publishing Corporation Facilitating Watermark Insertion by Preprocessing Media Ingemar J. Cox Departments of Computer Science and Electronic and Electrical Engineering University College London Adastral Park Postgraduate Campus Ross Building Martlesham Heath Ipswish Suffolk IP5 3RE UK Email Matt L. Miller NEC Research Institute 4 Independence Way Princeton NJ 08540 USA Email mlm@ Received 5 May 2003 Revised 17 January 2004 There are several watermarking applications that require the deployment of a very large number of watermark embedders. These applications often have severe budgetary constraints that limit the computation resources that are available. Under these circumstances only simple embedding algorithms can be deployed which have limited performance. In order to improve performance we propose preprocessing the original media. It is envisaged that this preprocessing occurs during content creation and has no budgetary or computational constraints. Preprocessing combined with simple embedding creates a watermarked Work the performance of which exceeds that of simple embedding alone. However this performance improvement is obtained without any increase in the computational complexity of the embedder. Rather the additional computational burden is shifted to the preprocessing stage. A simple example of this procedure is described and experimental results confirm our assertions. Keywords and phrases digital watermarking preprocessing digital rights management copy control. 1. INTRODUCTION There are a number of applications of watermarking in which it is necessary to deploy a very large number of watermark embedders. In such situations economic constraints are often severe and constrain the computational resources that are available for embedding. Unfortunately high-perfor-mance as measured by effectiveness fidelity and robustness watermark embedders commonly

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