Circularly Symmetric Watermark Embedding In 2-D Dft Domain

This paper presents an algorithm for rotation and scale invariant watermarking of digital images. An invisible mark is embedded in magnitude of the DFT domain. It is robust to compression, filtering, cropping, translation and rotation. The watermark introduces image changes that are invisible to the human eye. The detection algorithm does not require the original image. 1. INTRODUCTION Digital products can be easily copied and reproduced in a network enviroment. Therefore the watermarking of the multimedia products has been essential for copyright protection. A digital watermark is a digital signal carrying information about the copyright owner and it is expected to be permanently embedded into the digital products. In the following, we shall limit our presentation to digital image protection. The watermark should be robust to distortions (such as image processing and lossy image compression) and statistically undetectable. In order to be robust, it must be associated to the most sign..