MATLAB: Get the Centroid of a specific object in an image

centroidcircleimage processingImage Processing Toolboxobjectregionprops

Hi,
I have a binarized image with a circle as shown below, and I wish to get the centroid of the circle.
Can anyone please guide me how?
I have tried with using 'regionprops' with 'Centroid', however it does not provide me the centroid of the circle but the centroid of the whole image.
props = regionprops(binaryImage,'Centroid');
boundingBox = props.Centroid;
Also, I tried using 'BoundingBox' with 'regionprops' as well. But I am not sure whether the value given is location of the circle or the centroid of it. 
props = regionprops(binaryImage,'BoundingBox');
boundingBox = props.BoundingBox;
Thank you if anyone would like to help me.

Best Answer

I = imread("image.png") ; 
[y,x] = find(I==0) ; 
iwant = [mean(x) mean(y)] ; 
% check 
imshow(I) 
hold on
plot(iwant(1),iwant(2),'+r')
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