SVD and Lifting Wavelet Based Fragile Image Watermarking

Creation and distribution of digital multimedia, by copying and editing, has both advantages and disadvantages. These can facilitate unauthorized usage, misappropriation, and misrepresentation. Therefore the content providers have become more concerned. So image watermarking, which is the act of embedding another signal (the watermark) into an image, have been proposed for copyright protection and authentication by robust and fragile methodologies respectively. So for various applications, there are different watermarking algorithms, but here this work is mainly for authentication as the watermarking scheme is fragile. The discrete lifting based wavelet transform and the singular value decomposition (SVD) algorithms are used in this scheme. The former for the carrier or the image to be authenticated, while the latter for the logo which is embedded in the carrier. The distribution of SVD compressed pixel values are distributed in the wavelet domain based on a pseudorandom sequence. This has been observed to test the integrity of the stego image and its authentication. Moreover due to usage of lifting based wavelet transform and SVD the hardware implementability is better.