A Novel Approach for Digital Watermarking of an Image Using DFT

Watermarking techniques are always used for copyright and ownership assertion purposes to protect the important documents. There are various type of watermark embedding techniques in transform domain are presented, for example 2-D DFT, 2-D DCT, 2-D DWT, 3-D DCT and 3-D DWT. Some time in case of an image authentication research, an original image is divided into smaller blocks, and inserts a watermark into each and every block after that modification concept is used to detect the watermark in the blocks. A novel design of a DFT-based digital watermarking system for images is proposed in this paper. By using adding invisible watermark into the digital image, the system provides copyright protection. First of all, the original images is split into the blocks and proceed DFT transform after that by using Arnold scrambling change water mark and produce pseudo-random sequence, result a image with watermark is produce. The watermark detection is achieved with image segmentation process, DFT transform process and relativity process. A watermarking algorithm based on image segmentation, is also use for improve the security of the watermark with DFT algorithm.