From: Matt J on
"parkpoom " <khunpark(a)gmail.com> wrote in message <hn8960$oeg$1(a)fred.mathworks.com>...
> i can not find radius in each circle please help me. thank you for you kindness.
> my pic http://www.uppicweb.com/x/i/iv/img_and.jpg please help ...T_T
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Assuming you have the Image Processing Toolbox:

help bwconncomp
help regionprops