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Convolution in Fourier domain

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Radmilka
Radmilka 2015-5-16
回答： Star Strider 2015-5-16
Hello! I wanna implement 2D convolution using fft2 in such way:
F=fft2(im2double(imread('cameraman.tif')));
H=fft2(fspecial('motion',15,5));
G=F.*H;
But F and H are not the same size.. How to do this correctly?

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Star Strider
Star Strider 2015-5-16
One possibility would be to zero-pad the smaller image so it is the same size as the larger one.
From the documentation:
  • Y = fft2(X,m,n) truncates X, or pads X with zeros to create an m-by-n array before doing the transform. The result is m-by-n.

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