Image Watermarking using Hybrid Wavelets and Directional Filter Banks

Abstract

Image authentication is a primal approach of image security and copyright protection has become an importance issue in current authentication applications. Due to digitization of image data with storage and distributed processing, effortless copying, tampering and distribution of digital data has been made easier. Digital watermarking has emerged as a tool for protecting the image data from copyright infringement. In digital watermarking an newlineimperceptible signal watermark is embedded into the host image, which newlineuniquely identifies the ownership. In the process of embedding the watermark, newlineit is required that no perceptual degradation is observed. Additionally it is required that these watermarks should not be removable by unauthorized person and should be robust against intentional and unintentional attacks. Conventional Embedding procedure inevitably brings some permanent distortion to the original Image object. The basic problem observed in such newlinesystem are robustness, transparency, and the false positive problem. The false newlinepositive problem is observed due to error in selection of embedding coordinates newlinein the host image. This error results in lowering of embedding accuracy in the newlinewatermarking process. In addition to the false positive problem the issue of newlineDiagonal Line Problem is also observed. Which is defined as a occurrence of a newlineline diagonally in the reconstructed watermark, termed as a diagonal line newlineproblem. It is hence required to overcome these problems to achieve better newlinewatermarking performance. newline