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how to calculate the no. of pixel?

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hi all,
i done convert gray image to binary image. but how i want to calculate the how much no pixel in red circle as picture attached??
my image name is spect128x128
I15 = dicomread('spect128x128', 'frame', 15);
T15 = graythresh(level);
BW15 = imbinarize(I15,T15);
figure
imshowpair(I15, BW15, 'montage')

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Ameer Hamza
Ameer Hamza 11 Nov 2020
See bwconncomp(): https://www.mathworks.com/help/images/ref/bwconncomp.html. It returns a struct. You can check the number of elements in PixelIdxList property to count the pixels.
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mohd akmal masud
mohd akmal masud 12 Nov 2020
ok, thank you so much sir.
then how to to fill the color in every object. lets say i want fill blue color in object no.4?

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