Digital Image Watermarking A Comparative Study

Abstract

With the development of technology and the diverse ways of information storage and the ease of exchange through the Internet, information security has becomes one of the top research areas. And with the spread of digital images has become easy to manipulate with and change their content. Several techniques were proposed among of them digital image watermarking, but still this area needs a lot of research, as there is still a lack of global solution. Watermarking is a promising technology that can be used to fulfill the owner’s copyright protection. Where the information is hidden inside the contents. Two sets of image watermarking algorithms are collected and studied to investigate the common strengths and main gaps that should be focused on. The first is related to spatial domain where the watermark is embedded directly into the pixel data. And the second sets are related to frequency domain where the original image converts into predefined transformation before embed process. Some of performance measurement tools are collected and descripted to provide a common baseline performance measurement tool between watermarking algorithms. The watermarked image can be exposed to different kind of attacks; a number of attacks are collected and described of their impact on the image.