Investigation of Adaptive Watermarking Techniques

Abstract

Digital media offer several distinct advantages over analog media, such as high quality, easy editing, high fidelity copying. The proliferation of digitized media due to the rapid growth of networked multimedia systems has created an urgent need for copyright enforcement technologies that can protect copyright ownership of multimedia objects. The ease by which digital information can be duplicated and distributed has led to the need for effective copyright protection tools. Various watermarking techniques have been recently introduced in attempt to address these growing concerns. It is done by hiding data within digital audio, images and video files. Various techniques have been developed based on spatial method and Transform methods. In this paper we are evaluating these adaptive watermarking techniques and analyze these watermark techniques. Currently watermark techniques based on the transform domain are more popular than those of spatial domain .In transform domain methods, DWT based method is most widely used because of its robustness against compression and noise.