Image orientation watermarking technique for copyright protection
Image copyright protection utilizes watermarking as one of the Digital Right Management techniques to protect digital images. Watermarking involves embedding a signature into a given image to produce a watermarked copy. This copy is meant to prevent any deliberate or unintentional attempt to remo...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
2016
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/69368/1/FSKTM%202016%2037%20-%20IR.pdf |
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| Summary: | Image copyright protection utilizes watermarking as one of the Digital Right
Management techniques to protect digital images. Watermarking involves embedding
a signature into a given image to produce a watermarked copy. This copy is meant to
prevent any deliberate or unintentional attempt to remove the signature from its
content. In return, a copyright gains its validity based on such robust characteristics.
Watermarking attracts much interest in algorithm design to enable a signature to be
embedded on secrecy and encryption beds. Watermarking imitates steganography in
information hiding but with alternative priorities, it focuses on the cover and not on
the hidden message.
The use of watermarking has still not achieved a meaningful level of reliability in
copyright protection applications as to be able to resolve infringement claims in the
courts. This is due to two main obstacles. The first involves the need to consider
original image quality as the main evidence over any other clues. The second obstacle
on watermarking reliability in copyright protection involves the lack of an adequate
common measure that proves the superiority of one technique over another and then
hampers improvements to the efficiency and quality of algorithms
To address this problem, this research proposes a new image-orientation watermarking
technique overcoming the obstacles. The proposed technique intentionally corrupts
the original images under owner signature control to generate copies for public use.
Corruption is effected intrinsically by image operations such as resizing, which acts
to relocate the original from its default position to an alternative over a presumed
space. The design utilizes Principal Component Analysis and Blind Noise Level
Estimation to resemble these transitions over image resizing operations. In addition, it
formulates two measuring parameters, for evaluating protection techniques, namely
Protection Requirement Parameter (PR) and Distance Decision Measure (D).
The experiment has two phases which are Pre-Protection design and, Protection and
Infringement Resolve. In the Pre-Protection design, it investigates the proofing on image operation corruption to support the principle used in showing the preliminary
impact of data corruption made by resizing. In the second phase, using Protection and
Infringement Resolve, it proceeds to cover the performance of the main two
procedures of the protection technique along the validity parameters devised in this
work. Results set a PR threshold of 0.05 to be totally convincing as an efficient
requirement controlling parameter. Compared to the existing benchmarking noise
measures of PSNR, MSE, MAXERR and L2RAT analysis of variance (ANOVA) and
linearity are applied to support inferences from sample limits towards population
boundaries in order to establish rigid validity on PR.
The main conclusions of this research highlight the contradictions in the use of
watermarking as a tool in image protection as the basis for proposing an alternative
design. Digital watermarking techniques are usually complex and necessarily involve
the need to satisfy many conflicting requirements and tradeoffs. Unlike these
techniques, the proposed work adopts an image-oriented foundation that does not treat
the owner’s signature as paramount but, instead, makes the customer’s image traceable
through the owner’s signature on a transition path that uses original image quality as
the main basis for copyright resolution. Results obtained affirm the validity of this
design basis along with the proposed parameters that make comparison among
techniques possible. |
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