2D IFFT

Senthilkumar February 2, 2011 Coded in Scilab

The code was written in scilab by me. This will be used to calculate the Inverse fast fourier transform of 2D Transformed Image.

function [a] =ifft2d(a2) 
//a2 = 2D-DFT of any real or complex 2D matrix
//a = 2D-IDFT of a2  
m=size(a2,1)
n=size(a2,2)
//Inverse Fourier transform along the rows
for i=1:n
a1(:,i)=exp(2*%i*%pi*(0:m-1)'.*.(0:m-1)/m)*a2(:,i) 
end
//Inverse fourier transform along the columns
for j=1:m
atemp=exp(2*%i*%pi*(0:n-1)'.*.(0:n-1)/n)*(a1(j,:)).' 
a(j,:)=atemp.'
end
a = a/(m*n)
a = real(a)
endfunction

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