MATLAB: How can i calculate area enclosed by contour

area;contourImage Processing Toolbox

I used snake to enclosed the left ventricle; how can i calculate area enclosed by contour?

Best Answer

If you used activecontour, it returns a binary image, so you simply label it and call regionprops:

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

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MATLAB: How do you find the centroid of a particular Blob

Since you're working with a binary image here, BW2, you can use the bwpropfilt function to clean up the small areas.

BW2 = bwpropfilt(BW2, 'Area', 1);

The last input argument determines the largest # of regions to keep, so it can be lowered to just the one. From there regionprops would only detect the single centroid.

You could also pass area as an input to regionprops as it is and use the centroid of the largest area.

measurements = regionprops(BW2, 'Centroid', 'Area');
[~,ind] = max(cat(1,measurements.Area));
centroid = measurements(ind).Centroid;

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

Best Answer

Related Solutions

MATLAB: How do you find the centroid of a particular Blob

MATLAB: How to select an object of a bw image

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