MATLAB: Finding only circular objects

digital image processingimage processingImage Processing Toolboxshape recognition

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

Best Answer

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

Related Solutions

MATLAB: How to select an object of a bw image

With regionprops():

labeledImage = bwlabel(binaryImage);
measurements = regionprops(labeledImage, 'Area');
allAreas = [measurements.Area]

See my Image Segmentation Tutorial for a full demo: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862

MATLAB: Want to find the circular regions

Compute the circularities and determine the circularity that is the dividing line between a circle and non-circle

labeledImage = bwlabel(binaryImage);
props = regionprops(labeledImage, 'Area', 'Perimeter');
allAreas = [props.Area];
allPerimeters = [props.Perimeter];
circularities = allPerimeters .^ 2 ./ (4 * pi * allAreas);
acceptableCircs = circularities < 4; % Or whatever works
indexes = find(acceptableCircs);
circBlobsOnly = ismember(labeledImage, indexes);
imshow(circBlobsOnly);

Best Answer

Related Solutions

MATLAB: How to select an object of a bw image

MATLAB: Want to find the circular regions

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