Fourier transform for image data set

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Mohamed Ahmed
Mohamed Ahmed 2020-11-17
评论： Mohamed Ahmed 2020-11-17
Hello everyone
I'm writing a code for image dataset that has 1 main folder and 10 subfolders within, and I want to apply fourier transform to all images in these folders,
I wrote this code below but I can't find a way to access all 10 subfolders, and convert the images using (for loop).
This code gives me an error (MAP must be a m x 3 array) in (I = rgb2gray(I);) because of the size of (I).
can you please help me with this ?
code:
clc;
clear all;
img = dir('C:\AppliedProj\Train\0\*.jpg');
Images_num = length(img);
for i = 1:Images_num
fname = strcat('C:\AppliedProj\Train\0\', img(i).name);
I = imread(fname);
I = rgb2gray(I);
%Get Fourier Transform of an image
F = fft2(I);
% Fourier transform of an image
S = abs(F);
%get the centered spectrum
Fsh = fftshift(F);
%apply log transform
S2 = log(1+abs(Fsh));
%reconstruct the Image
F = ifftshift(Fsh);
f = ifft2(F);
path = strcat('C:\AppliedProj\New\0\', img(i).name);
imwrite(f,path);
end
Best regars

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回答（1 个）

KALYAN ACHARJYA
KALYAN ACHARJYA 2020-11-17
编辑：KALYAN ACHARJYA 2020-11-17
"This code gives me an error (MAP must be a m x 3 array) in (I = rgb2gray(I);) because of the size of (I)."
May be you are using Gray Scale Images, if yes then remove the rgb2gray assignmnet line and rest code will be same.
  2 个评论
Mohamed Ahmed
Mohamed Ahmed 2020-11-17
Yes, I need to convert it first to gray scale then apply the fourier transform,
I tried it with the (rgb2gray) function it worked but the resulting image was distorted

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