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extract.m

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+% Define the directory where your images are stored
+for dirName = {'train', 'test'}
+    imageDir = dirName{1};
+
+    % Initialize a dictionary (containers.Map) to store file comments
+    fileComments = containers.Map();
+    
+    % List all image files in the directory
+    imageFiles = dir(fullfile(imageDir, '*.jpg')); % Update the file extension as needed
+    
+    disp(['Total number of image files: ', num2str(length(imageFiles))]);
+    
+    % Iterate over each image file
+    for i = 1:length(imageFiles)
+        % Get the full file path
+        imagePath = fullfile(imageDir, imageFiles(i).name);
+        
+        % Use imfinfo to extract metadata
+        try
+            info = imfinfo(imagePath);
+        catch
+            disp(['Image not recognized or corrupted: ', imagePath]);
+            continue;
+        end
+        info = imfinfo(imagePath);
+        commentParts = info.Comment;
+        % Store the comment in the dictionary with the file name as the key
+        commentDict = containers.Map();
+        for j = 1:length(commentParts)
+            keyValue = strsplit(strtrim(commentParts{j}), '=');
+            if length(keyValue) == 2
+                commentDict(keyValue{1}) = keyValue{2};
+            end
+        end
+        fileComments(imageFiles(i).name) = commentDict;
+    end
+    % Define the output JSON file path
+    outputJsonFile = strcat(imageDir, '.json');
+    
+    % Write the JSON string to the output JSON file
+    fid = fopen(outputJsonFile, 'w');
+    if fid ~= -1
+        fwrite(fid, unicode2native(jsonencode(fileComments, 'PrettyPrint', true), 'UTF-8'));
+        fclose(fid);
+    else
+        disp('Error opening file.');
+    end
+end
+disp('Comments saved to JSON file.');