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This paper presents a transform domain fragile watermarking technique based on Fermat number transform (FNT). This transform domain is very simple and efficient in terms of computational complexity and speed. FNT is a true digital transform, which makes the watermarking method free from round-off errors. In this method, the image is divided into non-overlapping blocks and FNT is applied on each block...
In this paper we provide improvement over the existing watermarking technique based on encoding of the zeroes of the Z-Transform. Compare to the existing Z-Transform based watermarking technique, our technique provides better visual perceptibility and fragility. This improved algorithm not only more fragile but also makes watermark more image dependent.
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