A robust digital image watermarking using repetition codes against common attacks
Digital watermarking is hiding the information inside a digital media to protect for such documents against malicious intentions to change such documents or even claim the rights of such documents. Currently the capability of repetition codes on various attacks in not sufficiently studied. In thi...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2015
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/1258/2/ABDULLAHI%20MOHAMUD%20HASSAN%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/1258/1/24p%20ABDULLAHI%20MOHAMUD%20HASSAN.pdf http://eprints.uthm.edu.my/1258/3/ABDULLAHI%20MOHAMUD%20HASSAN%20WATERMARK.pdf |
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| Summary: | Digital watermarking is hiding the information inside a digital media to protect for
such documents against malicious intentions to change such documents or even
claim the rights of such documents. Currently the capability of repetition codes on
various attacks in not sufficiently studied. In this project, a robust frequency domain
watermarking scheme has been implemented using Discrete Cosine Transform
(DCT). The idea of this scheme is to embed an encoded watermark using repetition
code (3, 1) inside the cover image pixels based on Discrete Cosine Transform (DCT)
embedding technique. The proposed methods have undergone several simulation
attacks tests in order to check up and compare their robustness against various
attacks, like salt and pepper, speckle, compress, Gaussian, image contrast, resizing
and cropping attack. The robustness of the watermarking scheme has been calculated
using Peak Signal-To-Noise Ratio (PSNR), Mean Squared Error (MSE) and
Normalized Correlations (NC). In our experiments, the results show that the
robustness of a watermark with repetition codes is much better than without
repetition codes |
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