How to convert DICOM image to JPEG/PNG with out loosing it's metadata?

Question

Suba Suba 2016-9-15

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/303156-how-to-convert-dicom-image-to-jpeg-png-with-out-loosing-it-s-metadata

评论： ismail tepedag 2021-5-23

I need to convert my dicom image to jpg or png format without loosing it's meta data,I have already refered this link,but the solution given on that link is not working at all,cannot save the image as jpg. Please suggest some links or code to this conversion.

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ismail tepedag 2021-5-23

try below trick

b=mat2gray(output_image);

d=im2uint8(b);

new image is d without loosing much details...

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Answer 1

Gopichandh Danala 2016-9-16

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/303156-how-to-convert-dicom-image-to-jpeg-png-with-out-loosing-it-s-metadata#answer_235029

在 MATLAB Online 中打开

    % code
% 793 is a dicom image
DICOM_image = dicomread('793');
info = dicominfo('793');
window_center = info.WindowCenter;
window_width = info.WindowWidth;
rescale_slope = info.RescaleSlope;
rescale_intercept = info.RescaleIntercept;
low = abs(info.RescaleIntercept)-abs(info.WindowCenter)+30;
high = low+info.WindowWidth;
figure, imshow(DICOM_image, [low high]);
[nrows, ncols] = size(DICOM_image);
output_image = zeros(size(DICOM_image));
new_image = zeros(nrows, ncols);
max_pixel_intensity = 255;
for i = 1:nrows
    for j = 1:ncols
        new_image(i, j) = DICOM_image(i, j) * rescale_slope + rescale_intercept;
        if (new_image(i, j) < (window_center - window_width / 2))
            output_image(i, j) = 0;
        else if (new_image(i, j) > (window_center + window_width / 2))
                output_image(i, j) = max_pixel_intensity;
            else
                output_image (i, j) = (max_pixel_intensity / window_width) * (new_image(i, j) + window_width / 2 - window_center);
            end
        end
    end
end
output_image = uint8(output_image);
figure, imshow(output_image);
imwrite(output_image,'converted.jpg');

Hope it helps, Let me Know

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Suba Suba 2016-9-19

Yea,Okey.Thank you.

ismail tepedag 2021-5-23

What is 30 ? it works but why ?

low = abs(info.RescaleIntercept)-abs(info.WindowCenter)+30;

2. +window_width/2 shall not be existing in below code.

output_image (i, j) = (max_pixel_intensity / window_width) * (new_image(i, j) + window_width / 2 - window_center);

Have nice day !

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Answer 2

Walter Roberson 2016-9-16

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https://ww2.mathworks.cn/matlabcentral/answers/303156-how-to-convert-dicom-image-to-jpeg-png-with-out-loosing-it-s-metadata#answer_235033

编辑：Walter Roberson 2016-9-17

It is not possible to convert DICOM to JPG or PNG without losing metadata.

For JPEG files you could convert convert the metadata to some kind of string encoding, and then include it in the file as an EXIF "Description" field, provided that the encoding of the metadata does not occupy more than 64 Kb; see https://en.wikipedia.org/wiki/Exif

PNG does not have EXIF. You can, though, encode arbitrary metadata as name=value strings; see http://stackoverflow.com/questions/9542359/does-png-contain-exif-data-like-jpg -- or at least you could in theory, as imwrite() does not support that. You could, though, instead use the same technique as described above, encoding the metadata as strings (somehow) and then use imwrite() to PNG with the 'Description' name/value pair.

Working out how to convert all of the metadata to strings that could later be parsed would be up to you.