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Digital Watermarking for Images--Its Analysis and Improvement Using Digital Signal Processing Technique--
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/03/01
Print ISSN: 0916-8508
Type of Manuscript: INVITED PAPER (Special Section on the Trend of Digital Signal Processing and Its Future Direction)
watermarking, digital image, quantization, correlation, deconvolution,
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In this paper, we discuss digital watermarking techniques besed on modifying the spectral coefficient of an image, classified into quantization-based and correlation-based watermarking techniques. We first present a model of the watermark embedding and extracting processes and examine the robustness of the watermarking system against common image processing. Based on the result, we clarify the reason why detection errors occur in the watermark extracting process and give a method for evaluating the performance of the watermarking system. And then we study an improvement of the watermark extracting process using the deconvolution technique and present some concluding remarks in the last section.