how to draw a circle in an image?
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i want to draw a circle on an image using this equation x^2+y^2=r
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Accepted Answer
Jan
on 1 Mar 2017
img = rand(100, 100, 3) * 0.2; % Test data
value = bsxfun(@plus, ((1:100) - 50) .^ 2, ((1:100).' - 50) .^ 2);
r = 30;
mask = value < (r + 1)^2 & value > (r - 1)^2;
mask3 = cat(3, mask, mask, mask);
img(mask3) = 1.0;
image(img);
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