- Link:
- http://hdl.handle.net/1783.1/4308
- Collection:
-
- Subjects
- Digital watermarking Data encryption (Computer science) Image processing -- Digital techniques
- Creator:
- Yip, Shu Kei
- Format
- 339 bytes
- Format
- text/html
- Language
- en_US
- Type
- Thesis
- Description
- Thesis (M.Phil.)--Hong Kong University of Science
and Technology, 2006
- Description
- xi, 94 leaves : ill. ; 30 cm
- Description
- HKUST Call Number: Thesis ECED 2006
Yip
- Description
- Digital watermarking is one of the proposed methods
to prove the ownership and the authenticity of the media.
Watermarking is the process that embeds data, such as a company
logo or a signature, into a digital multimedia, such as a digital
image or video. Distortion is introduced during the watermark
embedding process. Although the distortion is normally small, for
some applications, such as medical and military, do not allow
permanent loss of signal fidelity. This highlights the need of
lossless watermarking. Lossless watermarking is a watermarking
technique which the original host image can be recovered perfectly
after the watermark extraction. In this thesis, lossy watermarking
and lossless watermarking algorithms are investigated. We can
achieve different objectives, such as excellent JPEG resistibility,
reduction in the Mean Square Error between the original image and
the watermarked image or selection of embedding regions, by
choosing different proposed algorithms with different types of
input images. Moreover, apart from using watermarking to the prove
the ownership of the media, we have noticed that watermarking and
data hiding can be used in trans-coding, such as resizing, or error
concealment. Side information can be embedded using watermarking or
data hiding. Experimental results show that we can obtain better
visual quality in resizing with the help of lossless data hiding
techniques.
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