Digital Image Watermarking: A Study on Techniques & Issues

Digital data can be easily copied and modified to create duplicate copies. These modified images are then redistributed through the Internet. As these illegal activities are becoming more and more common, mechanisms to protect digital resources are in high demand. Watermarking is an effective method for restricting abuses of published digital contents and to protect ownership rights of the owner. However, while watermarking, special care should be taken not to affect the visual quality of the host image. At the same time it must be reasonably robust and able to withstand illegal watermark removal attempts. This paper presents a study on watermarking techniques and associated issues. Index Terms – attacks, frequency domain transforms, image watermarking, performance evaluation, watermark embedding and extraction ——————————  ——————————