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Watermarking Spectral Images with Three-Dimensional Wavelet Transform Subject to Various Illumination Conditions

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Digital imaging continues its expansion into various applications. Spectral images are becoming more popular as one field of digital imaging. At the same time, the economic and security aspects in the utilization of images are finding increased emphasis. In this study, the authors apply a watermarking method for spectral images, whereby embedding is based on the three-dimensional wavelet transform. The authors study the influence of illumination to the watermarked images. The authors also define how to estimate an unknown illuminant. Experiments were performed on a dataset of 13 spectral images. These experiments indicate that the illumination in spectral images should be established before watermarking, owing to the properties of the illuminants. Using the proposed watermarking method, the embedded watermark is also robust towards lossy compression. Guidelines for the parameter selection for watermarking with the proposed approach are given.

Document Type: Research Article


Affiliations: 1: Department of Information Technology, Lappeenranta University of Technology, P.O.Box 21, FI-53851 Lappeenranta, Finland 2: Laboratory of Computer Science, University of Joensuu, P.O.Box 111, FI-80101 Joensuu, Finland 3: Laboratory of Physics, University of Joensuu, P.O.Box 111, FI-80101 Joensuu, Finland 4: School of Computer Science and Information Technology, RMIT University, GPO Box 2476V, Melbourne, Victoria 3001, Australia

Publication date: 2008-05-01

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  • The Journal of Imaging Science and Technology (JIST) is dedicated to the advancement of imaging science knowledge, the practical applications of such knowledge, and how imaging science relates to other fields of study. The pages of this journal are open to reports of new theoretical or experimental results, and to comprehensive reviews. Only original manuscripts that have not been previously published, nor currently submitted for publication elsewhere, should be submitted.

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