How to save the FFt results of an image in an array?

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Nour Sd 2018-11-16

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https://ww2.mathworks.cn/matlabcentral/answers/430217-how-to-save-the-fft-results-of-an-image-in-an-array

评论： madhan ravi 2018-11-16

采纳的回答： madhan ravi

在 MATLAB Online 中打开

Hello,

Please can you help me saving the result of the Fast Fourier Transform of an image so I can reuse it to draw the bessel function?

My code below, gives this error :

In an assignment A(:) = B, the number of elements in A and B must be the same.

Error in essai (line 13)

stored_values(ii) = Y;

clc;
close all;
imagefiles = dir('*.jpg');
nfiles = length(imagefiles);    % Number of image files found
stored_values = zeros(nfiles,4); % Preallocate the array for saving the values
for ii=1:nfiles
    currentfilename = imagefiles(ii).name;
    I = imread(currentfilename);
    myimage = rgb2gray(I); % Convert image to gray
    Y = fft2(double(myimage))
    stored_values(ii) = Y; 
    imagesc(abs(fftshift(Y)));
end

And if I change this line

stored_values(ii) = Y;

to this

stored_values(ii,1) = Y;

it gives this error:

Assignment has more non-singleton rhs dimensions than non-singleton subscripts

Error in essai (line 13)

stored_values(ii,1) = Y;

Please can anyone correct it for me?

Thank you.

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采纳的回答

madhan ravi 2018-11-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/430217-how-to-save-the-fft-results-of-an-image-in-an-array#answer_347275

编辑：madhan ravi 2018-11-16

在 MATLAB Online 中打开

stored_values = cell(1,nfiles); %before loop
stored_values{ii}=Y; %inside loop
celldisp(stored_values) %outside loop
[stored_values{:}] %double values