How to write datastore to folder?

Hi, may I know how to show and save the segmentation output from pixel label datastore to computer folder?

pxdsResults = semanticseg(imdsTest,net,"WriteLocation",tempdir);

What should be added after this line so that the output from this can be showed and saved to folder?

Answer 1

[Anudeep Kumar]

Hey Jun Er Sim

I went throught the documentation and based on the example code we can loop through the results to show them.

The code should look something like:

for i = 1:numel(pxdsResults.Files)
    % Read the original image
    originalImage = readimage(imdsTest, i);
    
    % Read the segmentation result
    segmentedImage = readimage(pxdsResults, i);
    
    % Overlay the segmentation on the original image
    overlayImage = labeloverlay(originalImage, segmentedImage);
    
    % Display the result
    figure;
    imshow(overlayImage);
    title(sprintf('Segmented Image %d', i));
end

Additionally we can save the overaly image to a specific folder as follows:

outputFolder = fullfile(pwd, 'SegmentationResults');
if ~exist(outputFolder, 'dir')
    mkdir(outputFolder);
end
for i = 1:numel(pxdsResults.Files)
    originalImage = readimage(imdsTest, i);
    segmentedImage = readimage(pxdsResults, i);
    overlayImage = labeloverlay(originalImage, segmentedImage);
    
    % Save the image
    outputFileName = fullfile(outputFolder, sprintf('SegmentedImage_%d.png', i));
    imwrite(overlayImage, outputFileName);
end

I have attached the documentation for 'semanticseg' and 'PixelLaelDataStore' for your reference. These should provide relevant information that will help you achieve your goal.

https://www.mathworks.com/help/releases/R2024b/vision/ref/semanticseg.html

https://www.mathworks.com/help/releases/R2024b/vision/ref/pixellabeldatastore.html

Hope it helps!