measure diameter of circle

Hi, I have project to measure diameter of microbubble. I succeed to detect circle but have no idea to measure diameter. the example is like below

[KSSV]

In the above bar plot..xaxis is diameter....already you have the diameters in hand....and when you get circles..it comes with radius or diameter information...

[Adam]

Surely if you have already detected the circles it isn't hard to get their diameters? What format do you have the detected circles in?

Answer 1

[dbmn]

As KSSV and Adam suggested, you should already have most Information readily available when you were able to detect the circles (circles are usually characterized by a parameter for center and radius).

> If you for example use the Matlab-built in imfindcircles it should give you something like

A = imread('coins.png');
imshow(A)
[centers, radii, metric] = imfindcircles(A,[15 30]);
viscircles(centersStrong5, radiiStrong5,'EdgeColor','b');