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how to calculate the area of certain portion of an image ?

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ajay
ajay 2014-1-2
评论： Image Analyst 2014-1-4
how to calculate the area of certain portion of an image ?

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Image Analyst
Image Analyst 2014-1-2
编辑：Image Analyst 2014-1-2
Call regionprops(). See my Image Segmentation Tutorial. It goes over all of that:
BlobsDemo
For example with a simple thresholding:
binaryImage = grayImage > 90;
measurements = regionprops(binaryImage, 'Area');
allAreas = [measurements.Area];
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Image Analyst
Image Analyst 2014-1-4
Then just get it. For example to get the area of blob #42, do this
blob42area = allAreas(42);
blob42area = measurements(42).Area; % Same thing as above.

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