How can I use a loop to save the output image of the program after each iteration?

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Gulfam Saju 2022-3-15

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https://ww2.mathworks.cn/matlabcentral/answers/1672384-how-can-i-use-a-loop-to-save-the-output-image-of-the-program-after-each-iteration

评论： Image Analyst 2022-3-16

for slice = 1:16
recon_img = senserecon(aliased_img, sen_map,reduc, fi_matrix);
figure;imshow(abs(recon_img),[0 0.000005]);
end

The code is big. So, I just mentioned the loop for the number of iterations here. Here, there will be 16 output images. How can I save all output images using a loop?

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Image Analyst 2022-3-16

By "output image" do you mean you want to save the variable recon_img in a file with a standard image format like PNG? Or do you want to save the figure, which would contain the image, tick marks, tick labels, the surrounding frame between the axes and the edge of the figure, any graphics that might have been drawn on the image, etc.? If you want the whole figure, use exportgraphics(). If you want just the image variable use imwrite() like I show you below in my answer.

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Answer 1

Image Analyst 2022-3-15

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在 MATLAB Online 中打开

It's probably a floating point image. Try converting it to uint8 before saving it.

outputFolder = pwd; % Wherever you want.
for slice = 1:16
    recon_img = senserecon(aliased_img, sen_map,reduc, fi_matrix);
    subplot(4, 4, slice);
    uint8Image = uint8(255 * mat2gray(abs(recon_img)));
    imshow(uint8Image, []);
    drawnow;
    baseFileName = sprintf('Image Slice %d.png', slice);
    outputFileName = fullfile(outputFolder, baseFileName);
    imwrite(uint8Image, outputFileName)
end

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Answer 2

Voss 2022-3-15

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在 MATLAB Online 中打开

for slice = 1:16
    
    recon_img = senserecon(aliased_img, sen_map,reduc, fi_matrix);
    
    imwrite(recon_img,sprintf('image_slice_%03d.png',slice)); % write recon_img to file
    
    figure;imshow(abs(recon_img),[0 0.000005]);
    
end

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Voss 2022-3-15

编辑：Voss 2022-3-15

Try experimenting with different options in imwrite().

If I had one of your images, I might be able to offer more specific advice.

Gulfam Saju 2022-3-15

在 MATLAB Online 中打开

print(gcf,'-dpng','-r200','sense_rec', slice);

when I use this, it perfectly works. But, I don't know how to run a loop on it.

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Answer 3

yanqi liu 2022-3-16

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在 MATLAB Online 中打开

for slice = 1:16
    recon_img = senserecon(aliased_img, sen_map,reduc, fi_matrix);
    figure;imshow(abs(recon_img),[0 0.000005]);
    print(gcf,'-dpng','-r200',sprintf('sense_rec%02d', slice));
end