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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 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.