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Robust Color Image Watermarking Using Nonsubsampled Contourlet Transform

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Author(s): C. Venkata Narasimhulu | K. Satya Prasad

Journal: International Journal of Computer Science and Information Security
ISSN 1947-5500

Volume: 9;
Issue: 3;
Start page: 100;
Date: 2011;
Original page

Keywords: Color image watermarking | Nonsubsampled Contourlet Transform | Singular value decomposition | Peak signal to noise ratio | normalized Correlation coefficient

ABSTRACT
In this paper, we propose a novel hybrid spread spectrum watermarking scheme for authentication of color images using nonsubsampled contourlet transform and singular value decomposition. The host color image and color watermark images are decomposed into directional sub- bands using Nonsubsampled contourlet transform and then applied Singular value decomposition to mid frequency sub-band coefficients. The singular values of mid frequency sub-band coefficients of color watermark image are embedded into singular values of mid frequency sub-band coefficients of host color image in Red, Green and Blue color spaces simultaneously based on spread spectrum technique. The experimental results shows that the proposed hybrid watermarking scheme is robust against common image processing operations such as, JPEG, JPEG 2000 compression, cropping, Rotation, histogram equalization, low pass filtering ,median filtering, sharpening, shearing ,salt & Pepper noise, Gaussian noise, grayscale conversion etc. It has also been shown the variation of visual quality of watermarked image for different scaling factors. The comparative analysis reveals that the proposed watermarking scheme out performs the color image watermarking schemes reported recently.
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