07-02-2013, 02:20 PM
Implementation of watermarking Technology for color images Using DWT-SVD
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Abstract:
The security and authenticity issues of digital image are becoming popular than ever, due to the rapid growth of multimedia and Internet technology. On Internet, digital images are easily and widely shared among the different users at different geographical places. Every day large amount of digital images are transmitted over the Internet in various applications. As digital technology allows unauthorized reproduction of digital images, the protection of the copyrights of digital image is a very important issue. Image watermarking schemes are used to protect the digital images. Image watermarking is the process of embedding an imperceptible data (watermark) into cover image. The image watermarking schemes have been widely used to solve the copyright protection problems of digital image related to illegal usage or distribution. Several image watermarking schemes are proposed, considering different view points. The image Watermarking schemes are classified into different types based on domain of processing, visibility of watermark and rigidity of scheme. Very few watermarking schemes have been proposed for defining the copyrights of color image. To resolve the copyright protection problem of color image, we propose an effective, robust and imperceptible color image watermarking scheme. This scheme embeds the watermark into cover image in (Red, Green, Blue) RGB space. The combination of Discrete Wavelet Transformation (DWT) and Singular Value Decomposition (SVD) of Blue channel is used to embed the watermark. The singular values of different subband coefficients of Blue channel are modified using different scaling factors to embed the singular values of the watermark. The copy of the watermark is embedded into four subband coefficients which are very difficult to remove or destroy. The combination of DWT and SVD increases the security, robustness and imperceptibility of the scheme.