Finding only circular objects?

2016 2 15
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I have a binary image with different shapes of objects. I want to calculate the number of only circular objects in the image. How can I do that by using regionprops function?
Thanks

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Image Analyst
Image Analyst 2016-2-15

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You can compute the circularity. See my attached shape recognition demo.

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rupam baruah
rupam baruah 2016-2-15
Thnks. How can I calculate total number of circles (suppose circulartity threshold is .85) in the image. Is there any particular function to find that thing? Thnks
Image Analyst
Image Analyst 2016-2-15
use ismember and bwlabel
labeledImage = bwlabel(binaryImage);
measurements = regionprops(labeledImage, 'Area', 'Perimeter');
allAreas = [measurements.Area];
allPerimeters = [measurements.Perimeter];
circularities = 4*pi*allAreas ./ allPerimeters.^2;
circleIndexes = find(circularities > 0.85);
circlesOnlyImage = ismember(labeledImage, circleIndexes) > 0;
[labeledImage, numCircles] = bwlabel(circlesOnlyImage);

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