__1. Original image__S = imread('pic13.jpg');

S = im2bw(S);

S2 = ~S;

imshow(S2);

__2. Extracting required objects' properties. Required properties are centroid and the area of the round objects. The area property is used to compute the radius of the object.__S3 = bwlabel(S2);

S4 = regionprops(S3,'Centroid','area');

R = sqrt(S4(1).Area/pi);

h = S4(1).Centroid(1);

k = S4(1).Centroid(2);

**ratio = [2 1.5 1];**

__3. Drawing circles around 1st object with different radius by refering to the radius of the object.__

nR = round(R*ratio);

t = 0:pi/20:2*pi;

x1 = (h+nR'*cos(t))';

y1 = (k+nR'*sin(t))';

hold on;

plot(x1,y1);