A Survey of Transform Domain based Semifragile Watermarking Schemes for Image Authentication

摘要

Image authentication is key research area for researchers' world over due to its important function in multimedia content authentication. Hence it's essential to check integrity of images before it can be put to use, in some applications such as medical, military and quality control images. In order to protect authenticity of images many approaches have been proposed, semifragile watermarking scheme is found useful in most of the practical applications. The aim of this paper is to present survey and comparison of transform domain based semifragile watermarking techniques for image authentication. Different transform domain methods used for semifragile watermark embedding are compared based on peak signal to noise ratio and mean square error. Comparative study reflects that selection of methods and parameters are application specific. Furthermore important requirements for an effective image authentication algorithm are also discussed.