Author/Authors :
Amirgholipour، Saeed نويسنده Department of Computer, Islamic Azad University, Ramsar Branch, Ramsar, Iran , , Naghsh-Nilchi، Ahmad Reza نويسنده Department of Computer Engineering, University of Isfahan, Isfahan, Iran , , Mohammad Sharifi، Aboosaleh نويسنده Department of Computer, Islamic Azad University, Ramsar Branch, Ramsar, Iran , , Alirezanejad، Mehdi نويسنده Department of Computer, Islamic Azad University, Firouzkouh Branch, Firouzkouh, Iran , , Arab، Moien نويسنده Department of Computer, Sharif University of Technology International Campus, Kish, Iran ,
Abstract :
It is generally believed that spatial domain watermarking methods are not robust against common image processing attacks. In this paper, a novel application of an unsharp mask is proposed to increase the performance of watermark recovery in correlation based watermarking. Commonly, unsharp mask is used to improve quality of the image by emphasizing its high frequency contents to enhance the edge and details information in it. Dissimilarity between different parts of image is increased by this filter. Thus, the watermark could recover more correctly from the watermarked image. This filter is applied before running watermark recovery procedure. To show efficiency of proposed filter on the spatial domain watermarking, it is applied on a typical correlation based method. Several experiments are done to evaluate the performance of proposed method is improved by applying this filter before watermark extraction procedure.
