ifft2 on an asymmetric matrix does not work correctly?
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I have a complex matrix of size 256x128. When I perform ifft2 the picture is folded across the y direction. The same ifft2 function works well on a symmetric matrix (128x128). Help
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Answers (1)
David Young
on 14 Jan 2015
ifft2 works correctly.
You can demonstrate this with the following code
img = rgb2gray(imread('peppers.png')); % example image
img = img(1:256, 1:128); % make it 256x128
img = double(img)/256; % double, scale to 0-1
imshow(img); % have a look
imgTrans = fft2(img); % transform
imgRestored = ifft2(imgTrans); % inverse transform
figure; imshow(imgRestored); % looks ok
There must be some other problem with the way you generate the 256x128 matrix.
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