A Robust Hybrid Watermarking Technique for Securing Medical Image Article Swipe
YOU?
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· 2018
· Open Access
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· DOI: https://doi.org/10.22266/ijies2018.0630.18
· OA: W2803447388
In the aim to contribute to the security of medical image, we present a robust watermarking method which combines discrete wavelet transform (DWT), discrete cosine transform (DCT) and singular value decomposition (SVD).This approach is intended to insert an invisible image watermark in a medical image.The cover medical image is divided up into the third level of DWT coefficients and then is transformed by DCT and SVD.The same procedure is applied to the watermark image.The singular value of watermark is inserted into the singular value of the high-frequency sub bands of the third level DWT of the cover image.However, the insertion of the watermark in these areas makes it possible to reinforce the robustness of the system of watermarking without hindering the quality of the watermarked image.The performance of the proposed method was evaluated in term of invisibility by calculating the Peak Signal to Noise Ratio (PSNR) between the original and the watermarked image and in term of robustness by measuring the normalized correlation coefficient (NC) between the original watermark and the extracted watermark after applying attacks.The experimental results approve that our proposed hybrid algorithm gives an excellent compromise imperceptibility and robustness against several attacks such as Gaussian noise, Saltand-Pepper, Speckle noise, Average filter, Median filter, and Wiener filter compared with existing methods.
