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Browsing by Author "Kayan, Hasan Volkan"

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    Master Thesis
    Watermarking in medical images by using DWT, DCT, DFT and lSB algorithms
    (2015) Kayan, Hasan Volkan
    Digital watermarking is a research area that is becoming increasingly common nowadays. Watermarking is performed by hiding a logo in the original image. In this thesis, logo images are embedded into the medical images (MRI) using DCT, DWT and DFT methods and various attacks are applied on the resulting images. After the attacks, the PSNR values of the attacked images are measured and the SR values of the recovered logo images are calculated. Moreover, using the LSB method, encrypted messages are embedded into the medical images. Then, by applying various attacks, the PSNR values and encrypted messages are extracted from these images. The main objectives of this study are to digitally watermark the medical images and compare the PSNR and SR values before and after the attacks on the images.