Digital watermarking is a process in which a piece of information is embedded into a digital data. In this article we review the digital watermarking scheme of image which uses DFT to embed the watermark. Digital watermarking using DFT has attracted researchers due to the fact that watermark using DFT are RST invariant compared to other scheme using other transforms such as DCT or DWT. In the presented article, we tried to cover all the aspect of digital watermarking particularly on DFT based scheme. We also gave some terminology used in the digital image watermarking and briefly discuss the attacks involved in digital image watermarking.
This paper proposes a visible watermarking scheme using Discrete Fourier Transformation and which is reversible with some additional information. In the proposed scheme follows one to one mapping between the DFT coefficient of the cover image and watermark. For the purpose of our scheme the watermark of different size is embedded into the standard test images. Experimental results shows that the watermarked image has good perceptible features and authorised user can recover the original cover image with superior visual quality. The peak signal ratio of the legally recovered image is >50db.
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