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Author(s): Mr. N. Suresh Kumar | Mr. B. Mathan Kumar

Journal: International Journal of Computer Science and Mobile Computing
ISSN 2320-088X

Volume: 2;
Issue: 4;
Start page: 363;
Date: 2013;
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Keywords: Watermarking | Curvelet Transform | FFT | Cooley Tukey

“Improved Method of Image Watermarking Using Cooley-Tukey Algorithm” presents atransformation and watermarking for Image Authentication. Initially, an image is taken and it istransformed by using Curvelet Transformation. This transformation was developed in order to representedges along curves more efficient than the traditional transformations. The concept of Fast FourierTransformation (FFT) algorithm is used in this paper to perform Curvelet Transformation. There are manyFFT algorithms exists and the most common FFT is the Cooley-Tukey algorithm, which is a divide andconquer algorithm. A secret image is taken and embeds with that transformed image. Then the Inverse FFTis applied to obtain the watermarking image. Finally, the embedded secret image is extracted using extractiontechnique. The resultant extract image is compared with the original secret image by calculating ratios usingPeek signal to Noise Ratio (PSNR). PSNR calculation of 2 images, one original and an extracted image,describes how far 2 images are equal. The higher the PSNR, the better the quality of the compressed orreconstructed image.
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