Plot nonlinear correlation between two images

2019 4 10
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更新时间：2019 4 10
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Hello,
I need to plot nonlinear correaltion between two images and if the images are same we get to see a sharp peak in the centre.
The formulation is : abs ( IFT( {FT(img1) FT(img2)} x {FT(img1) FT(img2)} / abs(FT(img1) FT(img2)) ) ).^2
can somebody help me realize the code to do this.
The image on left is when two images are same and o right is when they are different.
Thanksdd.png

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