Watermarking Techniques used in Medical Images: a Survey
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Cites background or methods from "Watermarking Techniques used in Med..."
...DCT and DFT give the spectral description of the input image while DWT transforms the input image into predictions onto basis vectors....
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...All other coefficients are titled the AC coefficients [13]....
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...DFT denotes the most popular technique to convert the images from the spatial domain to transform domain [36]....
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...6, respectively [13]: 𝐹(𝑢, 𝑣) = ∑ ∑ 𝑓(𝑥, 𝑦)𝑒−𝑗2𝜋( 𝑢𝑥 𝑁 + 𝑣𝑦 𝑀 ) 𝑀−1 𝑦=0 𝑁−1 𝑥=0 (5) = 𝑅(𝑢, 𝑣) + 𝑗𝐼(𝑢, 𝑣) 𝑓(𝑥, 𝑦) = 1 𝑁𝑀 ∑ ∑ 𝐹(𝑢, 𝑣)𝑒𝑗2𝜋( 𝑢𝑥 𝑁 + 𝑣𝑦 𝑀 ) 𝑀−1 𝑣=0 𝑁−1 𝑢=0 (6) Where: F(u,v) is the DFT coefficient, u=0,1,2,…,M−1, and v=0,1,2,…,N−1, R(u,v) and I(u,v) are the real and imaginary parts of DFT, respectively....
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...DFT decomposes an image in sine and cosine form....
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"Watermarking Techniques used in Med..." refers methods in this paper
...The other transform-based scheme is the contourlet transform (CT), introduced by Minh Do and Martin Vetterli [70, 71]....
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"Watermarking Techniques used in Med..." refers methods in this paper
...The proposed method was based on difference expansion (DE) technique which was proposed by Tian (2003) [94]....
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