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How to calculate the area of dark core of intensity distribution at Full width at half maximum?, which has ring like structure.

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MOHD
MOHD 2019-2-24
评论： MOHD 2019-2-26
Hello sir,
I have to calculate the area of dark core of intensity distribution at Full width at half maximum, which has ring like structure.
Can anyone help in this reard
Thanking you sir

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Image Analyst
Image Analyst 2019-2-24
Try this:
fileName = 'XYintensity.png';
grayImage = imread(fileName);
subplot(2, 1, 1);
imshow(grayImage);
axis('on', 'image');
drawnow;
threshold = mean([min(grayImage(:)), max(grayImage(:))])
mask = grayImage < threshold;
% Get rid of surround
mask = imclearborder(mask);
% Take biggest blob
mask = bwareafilt(mask, 1);
subplot(2, 1, 2);
imshow(mask);
axis('on', 'image');
% Get the area
area = bwarea(mask)
0000 Screenshot.png
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Image Analyst
Image Analyst 2019-2-25
I'm not sure what area you want but you can adjust the threshold from the "half maximum" intensity value you first requested to some other value (higher or lower) to control how much of the fuzzy donut hole it takes. Since it's not a step, but a sloped intensity, where you say the edge actually is, is a judgment call.

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