How to preserve image metadata

I want to preserve image metadata but my code strips all metadata. How do I stop this? I run this script from the MATLAB SDE command prompt. Code is below:

p = which('G0011363.JPG');
filelist = dir([fileparts(p) filesep '*.JPG']);
fileNames = {filelist.name};
fileNames_size = size(fileNames,2);
number_of_colums = fileNames_size;
for k = 1:number_of_colums
   imwrite(undistortImage(imread(fileNames{k}), cameraParams2cof, 'OutputView', 'valid'), (strcat(int2str(k), 'R2_3COF_ONRcorrected.jpg')));
end

[Andrew Nault]

The code shown below is what I used to solve my metadata problem. In it I store image capture date only:

load('C:\mypath\workspace.mat')
p = which('G0011363.JPG');
filelist = dir([fileparts(p) filesep '*.JPG']);
fileNames = {filelist.name};
   
fileNames_size = size(fileNames,2);
number_of_colums = fileNames_size;
   
for k = 1:number_of_colums
    k2 = imfinfo(fileNames{k});
    k3 = k2.FileModDate;
    imwrite(undistortImage(imread(fileNames{k}), cameraParams2cof, 'OutputView', 'valid'), (strcat(int2str(k), '_R2_3COF.jpg')), 'jpg', 'comment', k3);    
end

[Image Analyst]

Yeah it's too bad they only allow a single "comment" meta data tag and not all of the IPTC and EXIF tags.

Answer 1

[Andrew Nault]

A rose by any other name is just as sweet. I may not have literally extracted and transferred "metadata" but I have the information I need and I was able to imbed it in the new undistorted images. Of special note in the code below, I changed the metadata variable captured to "DateTime" and added total time (in seconds) to the title in lieu of strictly by the books metadata.

load('C:\redacted_lol\workspace.mat')
p = which('G0017317.JPG');
filelist = dir([fileparts(p) filesep '*.JPG']);
fileNames = {filelist.name};
fileNames_size = size(fileNames,2);
number_of_colums = fileNames_size;
k5 = 0;
for k = 1:number_of_colums
    k2 = imfinfo(fileNames{k});
    k3 = k2.DateTime;
    k4 = strrep(k3(12:19), ':', '-');
    k5 = k5 + 2;
    imwrite(undistortImage(imread(fileNames{k}), cameraParams2cof, 'OutputView', 'valid'), (strcat(int2str(k5), 'SECONDS_LEFTT_', k4, '.png')), 'png', 'comment', k3);    
end

Answer 2

[Image Analyst]

You are creating a brand new image. You did not extract the metadata (EXIF and IPTC tags) from the image so it's not being saved. Also, even if you did extract the tags, I'm pretty sure imwrite() does not have the ability to include metadata tags. I think the TIFF class ( http://www.mathworks.com/help/matlab/ref/tiff-class.html ) does give you the ability to save some tags but I have not used it and don't know if you can save EXIF and IPTC tags.