A new watermarking method using high frequency components to guide the insertion process in the spatial domain

Abstract

This paper presents a new method for signing digital images using high frequency components to guide the way digital watermarks are inserted in the image. Although this is not a new idea, we implement it working in the spatial domain, which means a more efficient algorithm and less processing time. We use a user’s configurable line segment chain to define the watermark and line segments that can be found in high frequency components of an image to guide the process of inserting the watermark. Therefore, this method offers a new way of finding specific zones of the image where watermark is to be inserted. It also presents a distributed system for signing digital images using watermarks and delivering watermarked images over Internet. This system provides secure access using Java applets and a Certification Authority.