Identifying the circle that fits the outer white pixels in a binary image (or make external mask)

Prashant Kumar answered . 2025-07-30 03:10:18

I = imread("SampleXRmorph.PNG");
[y,x] = find(I) ; 
% Get center of cricle 
C = [mean(x) mean(y)] ; 
% GEt raidus 
d = sqrt((C(1)-x).^2+(C(2)-y).^2) ; 
R = max(d) ;  
% plot circle 
th = linspace(0,2*pi) ; 
xc = C(1)+R*cos(th) ; 
yc = C(2)+R*sin(th) ; 
% 
imshow(I)
hold on
plot(xc,yc,'r')

 

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