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Digital Image Watermarking Based On Joint (DCT-DWT) and Arnold Transform
Majdi Farag Mohammed El Bireki,M. F. L. Abdullah,li Abdrhman M. Ukasha,Ali A. Elrowayati 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.5
The researcher has adopted a digital watermarking technique which operates in the frequency domain: a hybrid watermarking scheme based joint discrete wavelet transform – discrete cosine transform – (DWT-DCT). Its main objective is to test whether this technique can withstand attacks (its robustness) and invisibility (its imperceptibility), achieved by taking DCT of the DWT coefficients of the LL mid-frequency sub-bands from its band. To ensure security, the secret code (watermark) is scrambled using the Arnold transformation which is embedded in the original host image; only gray-scale digital images are used. The results of this research reveal that the secret code (watermark) is strong enough against threats (noise). Comparative results are measured using signal-to-noise ratio criterions, mean square error and normalized cross correlation. Simulated experimentation is done in Matlab.