Draw multiple circles in one image

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Hello, everyone,
I need your help. I wanted to draw several circles in one picture and edit them later. Attached is a screen shot. thank you for your help
Latifa

Accepted Answer

KSSV
KSSV on 27 Jul 2022
Edited: KSSV on 27 Jul 2022
R = 2:2:10 ;
th = linspace(0,2*pi) ;
figure
hold on
for i = 1:length(R)
x = R(i)*cos(th) ;
y = R(i)*sin(th) ;
plot(x,y)
end
axis equal
  9 Comments
Walter Roberson
Walter Roberson on 12 Aug 2022
You cannot reliably recreate the roi given just the subimage and comparing it to 0, as interior pixels could be 0.
You could, it is true, take the subimage and fit a circle to it to recreate the roi.
But if you are going to need the roi later, just record the mask variables as well, it saves a lot of trouble.

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