Convert multiple images in a single .mat file into jpg images

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Shourya 2022-1-28

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https://ww2.mathworks.cn/matlabcentral/answers/1638480-convert-multiple-images-in-a-single-mat-file-into-jpg-images

评论： Shourya 2022-2-8

There is a .mat file that contains images and I don't have much information about it. I'd like to convert each of these images stored in the single .mat file to jpg and view them. I would also like to know why these images are stored in a single .mat file as opposed to multiple .mat files. Please help.

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Image Analyst 2022-1-28

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https://ww2.mathworks.cn/matlabcentral/answers/1638480-convert-multiple-images-in-a-single-mat-file-into-jpg-images#answer_884170

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Who knows why they chose a single one instead of multiple files. Anyway, to get the images out, assuming they are called iamge1, image2, etc.

s = load(fullFileName)
imwrite('image1.png', s.image1); % Don't use jpg or you'll have compression artifacts.
imwrite('image2.png', s.image2); % Don't use jpg or you'll have compression artifacts.
imwrite('image3.png', s.image3); % Don't use jpg or you'll have compression artifacts.

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Image Analyst 2022-2-1

在 MATLAB Online 中打开

You have to figure out how many patches (images) are across that, and then divide the image up into parts

numImages = 8; % Or whatever it is.
s = load('file_one.mat')
output_array = s.output_array;
[rows, columns, numberOfColorChannels] = size(output_array);
if numberOfColorChannels == 3
    output_array = rgb2gray(output_array);
end
% Extract and display them all in separate subplots.
columnsPerPatch = floor(columns / numImages)
plotRows = ceil(sqrt(numImages));
k = 1;
for col = 1 : columnsPerPatch : columns
    thisImage = output_array(:, col : col + columnsPerPatch - 1);
    subplot(plotRows, plotRows, k);
    imshow(thisImage, []);
    k = k + 1;
end