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Digital Image Watermarking using Fuzzy Logic approach based on DWT and SVD

image watermarking is implemented using fuzzy logic approach based on transform domain. Fuzzy logic is an approach based on "degrees of truth" rather than usual "true or false" i.e., Boolean logic. In this paper, we use a reference image instead of original image. To get a reference image Directive contrast and Threshold value are calculated for middle and high frequency bands. A transform domain with the help of fuzzy logic system is used to embed the watermark in the reference image. Here fuzzy logic is used to find the alpha value that is used to embed the watermark. Watermark embedding is based on DWT and Singular Value Decomposition (SVD). After decomposing the cover image into four bands, SVD is applied to one of the frequency bands, and embed the same watermark data by modifying the singular values. Attacks are also performed on watermarked image. Quantitative measures like PSNR, NCC are also calculated to test the watermarked image and also extracted watermarks with and without attacks