Overlay mask on to original image

Question

Joe Perkins 2017-6-28

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https://ww2.mathworks.cn/matlabcentral/answers/346654-overlay-mask-on-to-original-image

回答： Image Analyst 2017-6-28

Hi - Coming to the end of writing a script to first segment particles and then save each individually. Ideally I would only like the particle pixels (without background in boundary box) so I am attempting to create masks of each particle, overlay this, make each binary ROI (value of 0) 'transparent' so that the particle is on show with white (value of 1) surroundings - I have tried modifying other similar examples on here but none of them seem to work and the saved image is just the cropped image mask or a big white box ... any advice would be greatly appreciated.

%I = original image 
%binaryImage3 = logical mask created earlier on
    folder = 'c:/Users/ezxjp1/Documents/MATLAB/ParticleImages'
      for k = 1 : numberOfParticles          
          % Find the bounding box of each particle.
          thisParticleBoundingBox = particleMeasurements(k).BoundingBox;
          % Extract out this particle into it's own image.
          subImage = imcrop(I, thisParticleBoundingBox);
          % Create binary mask of subplot and overlay 
          subImageMask = imcrop(binaryImage3, thisParticleBoundingBox);
          subImageMaskUnit8 = im2uint8(subImageMask);
          % Get size of original image 
          [rowssubImage, colssubImage, numberOfColorChannelssubImage] = size(subImage); 
          [rowssubImageMaskUnit8, colssubImageMaskUnit8, numberOfColorChannelssubImageMaskUnit8] = size(subImageMaskUnit8); 
          % If size of mask does not match original, resize mask
      if rowssubImageMaskUnit8 ~= rowssubImage || colssubImage ~= colssubImageMaskUnit8 
          subImageMaskUnit8 = imresize(subImageMaskUnit8, [rowssubImage colssubImage]); 
      end
          Inew = subImage.*repmat(subImageMaskUnit8,[1,1,3]);
          pngFileName = sprintf('Particle_%d.png', k);
          fullFileName = fullfile(folder, pngFileName);
          saveas(gcf, fullFileName);
  end

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Guillaume 2017-6-28

I'm not really clear what it is you're trying to do. Presumably, your particleMeasurements come from regionprops, isn't what you want the Image property returned by regionprops?

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