MATLAB: How to crop bigger size of blob in binary image and count its pixel .

bounding boxcropImage Processing Toolboximage segmentationMATLABrahulpunk

Best Answer

Not sure what you mean. You can use imcrop() if you want. You can also find the bounding boxes if you want:

props = regionprops(binaryImage, 'BoundingBox');

To crop out each one individually, do this

for k = 1 : length(props)
    thisBB = props(k).BoundingBox;
    subImage = imcrop(binaryImage, thisBB);
    figure;
    imshow(subImage);
end

This is done in my Image Processing Tutorial

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Hi,

I understand what you are trying to achieve, please have a look at this. It might help you filter out the smaller pieces that you dont need.

MATLAB: Auto cropping of pollen

First of all, take a black shot with no pollen in there, and divide your image by that blank shot to do background correction. I'm attaching a demo.

After that, you can do thresholding and cropping like I do in my Image Processing Tutorial: My File Exchange

You might want to convert your image to a binary image using the Color Thresholder on the Apps tab of the tool ribbon. Use the Export button to export the function to do the binarization. Basically to crop each, you'd do

props = regionprops(binaryImage, 'BoundingBox');
figure % Bring up new figure.
spRows = ceil(sqrt(length(props)));
for k = 1 : length(props)
        thisBB = props(k).BoundingBox;
        subImage = imcrop(originalImage, thisBB);
        subplot(spRows, spRows, k);
        imshow(subImage);
end

If you want a specific width and margin to your bounding boxes, then take thisBB and modify it. Like, to make it 50 pixels wider and 75 pixels taller:

thisBB(1) = thisBB(1) - 50;
thisBB(3) = thisBB(3) + 100;
thisBB(2) = thisBB(2) - 75;
thisBB(4) = thisBB(4) + 150;

Or, to make it always 200 pixels wide and tall, do this:

midx = thisBB(1) + thisBB(3)/2; % Right side plus half the width.
thisBB(1) = midx - 100;
thisBB(3) = thisBB(1) + 199;
midy = thisBB(2) + thisBB(4)/2;
thisBB(2) = midy - 100;
thisBB(4) = thisBB(2) + 199;

Best Answer

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