How can I use " imfindcircles" ?

Hi every one :) I have the following Figure ,, I need to use the function " imfindcircles " but it gives me empty matrix Can any body help ??

Answer 1

[Wayne King]

Hi Christine, you may want to increase the sensitivity a bit. Here, use the file I attach and run the following code.

im = imread('circle.png');
[centers1,radii1] = imfindcircles(im,[30 60],'ObjectPolarity','dark','Sensitivity',0.95);

[Christine Ak]

thxxx Alot .. it was helpful :D