Digital image watermaking using redundant wavelet transform for copyright protection
The concern of the digital image copyright management raised the research interest all over the world recently. One of the methods to protect our copyright of digital image is using the watermarking technique. Watermarking technique hides digital copyright information into the digital images impe...
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| 格式: | Thesis |
| 语言: | English |
| 出版: |
2007
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| 主题: | |
| 在线阅读: | http://eprints.usm.my/51445/1/Lim%20Say%20Yarn.pdf http://eprints.usm.my/51445/ |
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| 总结: | The concern of the digital image copyright management raised the research
interest all over the world recently. One of the methods to protect our copyright of
digital image is using the watermarking technique. Watermarking technique hides
digital copyright information into the digital images imperceptibly. This digital copyright
information can be extracted for the verification purpose when a copyright issue was in
question. A new redundant wavelet transform based digital image watermarking
scheme was introduced. Redundant wavelet transform is used in the watermark
embedding process because of its property that the size of coefficients remains the
same as the original image after decomposition process. This increases the capacity of
the watermarks that can be embedded into one image. Besides that, as commonly
known, watermark information which is embedded in frequency domain is more robust
to attacks. Logo-based watermark is used in the watermarking scheme so that it can
easily be identified during the verification process. The watermarks are embedded by
adaptively modifying a block of redundant wavelet transform coefficients. This
redundant wavelet transform watermarking scheme can be used on gray scale images
and color images. The properties of the watermarking scheme such as the perceptual
quality of the watermarked images and robustness were tested. Besides that, a
benchmark tool, StirMark, is applied to watermarked images to evaluate the
performance of the watermarking scheme. The experimental result showed that the
watermarking scheme produced a good perceptual quality of the watermarked image
and possessed its robustness to some common image processing attacks. |
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