How do we take the inverse fourier transformof this image

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Arya Gopan 2020-12-6

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https://ww2.mathworks.cn/matlabcentral/answers/682448-how-do-we-take-the-inverse-fourier-transformof-this-image

评论： Arya Gopan 2020-12-7

采纳的回答： Setsuna Yuuki.

I need to find the inverse tramsform of the second image

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Answer 1

Setsuna Yuuki. 2020-12-6

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https://ww2.mathworks.cn/matlabcentral/answers/682448-how-do-we-take-the-inverse-fourier-transformof-this-image#answer_566988

在 MATLAB Online 中打开

Your image:

img = imread('imagen','jpg');
h = ifft2(img); %inverse fourier transform
imagesc(abs(h(:,:,1)));

inverse fourier transform:

[r,c,~] = size(h);
H = abs(h(fix(c/2):end,fix(c/2):end,1));
H2 =[H fliplr(H)];
H = [H fliplr(H); flip(H2)];
figure
imagesc(H)

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Arya Gopan 2020-12-7

在 MATLAB Online 中打开

Sir this is the code I used so far from reading the image to taking its fourier transformand then cropping one part of it. Can you please check the last part of the code. I want the inverse fourirer transform using ifftshift

clear all
I = imread('a35.jpg');
I = rgb2gray(I);
[r , c] = size(I);
for i = 1:r
    X(i,:)=fft(I(i,:));
end
for j = 1:c
    Y(:,j)=fft(X(:,j));
end
figure(1)
imshow(I)
figure(2)
M=Y;
M=fftshift(M);
Ab=abs(M);
Ab=(Ab-min(min(Ab)))./(max(max(Ab))).*225;
imshow(Ab)
X=zeros(size(Ab));
X(475:563,556:639,:)=1;
p = Ab.*X;
subplot(2,1,1)
imshow(Ab);
title('Orginal')
subplot(2,1,2)
imshow(p);
title('Cropped')
IFF=(ifftshift(ifft(p)));
Final=uint8(real(IFF));
figure
imshow(Final);