Storing image properties in loop

Question

Mathew Smith 2022-9-12

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1803565-storing-image-properties-in-loop

评论： Mathew Smith 2022-9-12

Hi,

I would like to ask you to help me to store image name and map in for-end loop. Here they are in square brackets [X, mapX] but how to store for each image name the properties in different letter?

a = dir(fullfile(yourfolder, 'img_??.jpg')); 
for i = 1:length(a)
    imgname(i) = char(a(i.name)
    [X, mapX] = rgb2ind(imread(imgname),256);
end ;

Best regards

Michal

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Answer 1

Image Analyst 2022-9-12

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https://ww2.mathworks.cn/matlabcentral/answers/1803565-storing-image-properties-in-loop#answer_1051915

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@Mathew Smith do it this more robust way:

imageFolder = pwd;
fileListing = dir(fullfile(imageFolder, 'img_*.jpg')); 
if isempty(fileListing)
    warningMessage = sprintf('No jpg image files found in %d.\n', imageFolder);
    uiwait(warndlg(warningMessage));
    return;
end
allFileNames = {fileListing.name}'
numFiles = numel(allFileNames)
counter = 0;
ca = cell(numFiles, 2); % Preallocate space.
for k = 1 : numFiles
    thisFileName = fullfile(imageFolder, allFileNames{k});
    fprintf('Processing file #%d of %d : "%s"\n', k, numFiles, thisFileName);
    [rgbImage, embeddedColorMap] = imread(thisFileName);
    [rows, columns, numberOfColorChannels] = size(rgbImage);
    % If it's not RGB, skip it.
    if numberOfColorChannels < 3
        fprintf('    Skipping "%s" because it is not true color RGB.\n', thisFileName);
        continue;
    end
    [indexedImage, computedColorMap] = rgb2ind(rgbImage,256);
    % Save these in a cell array
    counter = counter + 1;
    ca{counter, 1} = indexedImage;
    ca{counter, 2} = computedColorMap;
end
% Crop in case we skipped any
if counter < numFiles
    ca = ca(1 : counter);
end