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DFT and FFT of Image

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bigdog
bigdog 2015-4-8
评论： JANITHA about 15 hours 前
Shift the Fourier transform so that it is centered around the middle of your figure and plot the absolute value of the shifted DFT. Then apply the log transform (log(1 + DFT)) and plot your result.
I know that I'm supposed to use fft2 and fftshift. I have the image and this is the code I have this far.
>> X = imread('granular_media.jpg');
>> X1 = double(X(501:700,1401:1600));
>> X2 = double(X(1:200,1:200));
I need to first compute the DFT of the 200x200 subimages that I created. Any help with this?
  1 个评论
JANITHA
JANITHA about 15 hours 前
DFT in image processing log of magnitude of FT

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