期刊名称：International Journal of Computer Technology and Applications
电子版ISSN：2229-6093
出版年度：2012
卷号：3
期号：3
页码：1023-1028
出版社：Technopark Publications
摘要：Watermarking is a technique of embedding hidden and unnoticeable signal into an image in the form of text and image so that even if unauthorized person tries to access and use it illegally, he could be caught on the basis of Copyright Protection and Ownership Identification. There are 2 methods that can be followed to embed a watermark in an image: Visible Watermarking and Invisible Watermarking. Visible Watermarking is used to display the watermark inside the image so that intruder can’t use it unless he has copyrights for that image. Invisible Watermarking hides watermark from the intruder so that he can be caught on the basis of Copyright Protection. Quality loss is the major issue in Watermarking. Embedding watermark inside the image can degrade the quality of watermarked image. In this paper we are going to present a technique that can reduce less amount of quality after the insertion of watermark in both visible and invisible watermarking methods. The implementation of Visible and Invisible Watermarking methods is realized with the help of MATLAB. Results are taken by calculation of PSNR values of Watermarked images after applying various attacks on Watermarked image to check the efficiency of Watermarking
关键词：Discrete Wavelet Transformation (DWT); Invisible Watermarking; Visible Watermarking; Information Hiding; Copyright Protection; Quality loss
