Noise Attack Analysis on Non Blind DWT Watermarking Algorithm

This article presents the analysis of strength of watermarking algorithm against various noises like Gaussian, Speckle etc. Digital watermarking is the technique to insert some kind of ownership information in any digital media like image, audio, video. This enables the owner of the media to claim the ownership against any illegal use or claim of false ownership. These watermarks are permanent and unalterable and can be an image, receipt of copyright revenues etc. Proposed work deals with a review of the various attacks on the watermarked image to alter the watermark, remove the watermark, to degrade the quality of watermark. After the knowledge of all attacks we find a pre implemented algorithm for watermark embedding i.e. “Non blind discreet wavelet transformation based digital watermark embedding and extraction algorithm”. Keywords— Watermarked image, Blind watermark, Non blind watermark, Watermark embedding, Watermark extraction, Host image, Watermark.