draw a set of circles on a given image

2012 6 6
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更新时间：2018 9 11
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hi; I have a set of circles where each circle is defined by its center position (x,y) and its radius r. i want to find a way in order to draw those circles on a given image* Img* . i used a matrix with three columns [x y r] to store the set of circles. any idea please? thank you

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Elad
Elad 2012-6-6

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imshow(image);
hold on
% x, y: Center of the circle
% r: Radius of the circle
theta = 0 : (2 * pi / 10000) : (2 * pi);
pline_x = r * cos(theta) + x;
pline_y = r * sin(theta) + y;
plot(pline_x, pline_y, '-');
hold off

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thoraya
thoraya 2012-6-7
thank you Elad.this work very well
i incorporated it in a for loop so it gave me good results
if i have another geometric shape ellipses or rectangle i do it with the same way?
thoraya
thoraya 2012-6-7
thank you Elad.this work very well
i incorporated it in a for loop so it gave me good results
if i have another geometric shape ellipses or rectangle i do it with the same way?
thoraya
thoraya 2012-6-7
thank you Elad.this work very well
i incorporated it in a for loop so it gave me good results
if i have another geometric shape ellipses or rectangle i do it with the same way?
thoraya
thoraya 2012-6-7
thank you Elad.this work very well
i incorporated it in a for loop so it gave me good results
if i have another geometric shape ellipses or rectangle i do it with the same way?
Ryan
Ryan 2012-6-7
Your comment is showing. You can use that method to plot any pair of x,y vectors on top of an image, you just need to know the equation that defines the shape.
is not working on my image. I want 1d 2d and 3d like r1 r2 and r3 circle on my image how can I add, please help me

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