期刊名称：International Journal of Advanced Research In Computer Science and Software Engineering
印刷版ISSN：2277-6451
电子版ISSN：2277-128X
出版年度：2013
卷号：3
期号：6
出版社：S.S. Mishra
摘要：Digital image watermarking is hiding information in any form (text, image, audio and video) in original image without degrading its perceptual quality. Watermarking is done for copyright protection of the original data. In this paper, we have done a comparative study of two most recent techniques used in digital image watermarking; they are DWT and hybrid DWT-SVD. Both these techniques are very much robust and imperceptible. In case of DWT, decomposition of the original image is done to embed the watermark and in case of hybrid DWT-SVD firstly image is decomposed according to DWT and then watermark is embedded in singular values obtained by applying SVD. Here, the techniques are compared on the basis of PSNR value at different values of scaling factor, high value of PSNR is desired as it shows good imperceptibility of the technique.
关键词：Watermarking; DWT (Discrete Wavelet Transform); SVD (Singular Value Decomposition); PSNR (Peak ;Signal to Noise Ratio).
