how can i calculate area enclosed by contour?
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dziri halima
on 11 Jul 2015
Commented: Image Analyst
on 15 Jul 2015
I used snake to enclosed the left ventricle; how can i calculate area enclosed by contour?
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Accepted Answer
Image Analyst
on 11 Jul 2015
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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Image Analyst
on 15 Jul 2015
You're just calling some automatic threshold on the image and using that to calculate the area.
nb = im2bw(I, graythresh(I));
labeledImage = bwlabel(nb);
measurements = regionprops(labeledImage, 'Area');
allAreas = [measurements.Area]
You're not even using the results of your snakes algorithm at all! Even so, I'd be surprised if the auth-thresholded image for both images gave the very same areas. But regardless, I don't think that's what you want to do. You can use the snake boundaries and pass them into poly2mask() to create a binary image from the snake boundaries.
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