Multipurpose Image Watermarking Algorithms and Applications - Intelligent Multimedia Data Hiding - page 276

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Multipurpose Image Watermarking Algorithms
and Applications

Zhe-Ming Lu 1,2 , Hans Burkhardt 3 , and Shu-Chuan Chu 4

1

Institute for Computer Science, University of Freiburg
Georges-Koehler-Allee 052, room 01-046
79110 Freiburg i.Br., Germany
[e-mail]

2

Department of Automatic Test and Control, Harbin Institute of Technology,
P.O. Box 339, 150001 Harbin, China
[e-mail]

3

Institute for Computer Science, University of Freiburg Georges-Koehler-Allee
052, room 01-030 79110 Freiburg i.Br., Germany
[e-mail]

4

Department of Information Management Cheng-Shiu University, Kaohsiung 840,
Taiwan
[e-mail]

Summary. The rapid growth of digital multimedia and Internet technologies has
made copyright notification, copyright protection, copy protection, integrity verifi-
cation and multimedia retrieval to become important issues in the digital world. To
solve these problems, digital watermarking technique and content based multimedia
retrieval have been presented and widely researched. In this chapter, we consider
the following three applications for images: (1) to achieve the goal of content au-
thentication and copyright protection simultaneously; (2) to notify and protect the
copyright of digital images simultaneously; (3) to develop a multipurpose watermark-
ing scheme for image retrieval. For the first application, the motivation and main
idea is as follows: traditional watermarking algorithms are mostly based on dis-
crete transform domains, such as discrete cosine transform (DCT), discrete Fourier
transform (DFT) and discrete wavelet transform (DWT). Most of these algorithms
are good for only one purpose. Recently, some multipurpose digital watermarking
methods have been presented, which can achieve the goal of content authentication
and copyright protection simultaneously. They are based on DWT or DFT. Lately,
several robust watermarking schemes based on vector quantization (VQ) have been
presented, but they can be used only for copyright protection. Here, we describe our
multipurpose digital image watermarking method based on the multistage vector
quantizer structure, which can be applied to image authentication and copyright
protection. In this method, the semi-fragile watermark and the robust watermark
are embedded in different VQ stages using different techniques, and both can be ex-
tracted without the original image. Simulation results demonstrate the effectiveness
of this algorithm in terms of robustness and fragility. For the second application,