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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.
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