Save the circle periphery after detecting the circle

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KatherineL
KatherineL 2020-4-22
评论： KatherineL 2020-4-24
Hello,
I have an image of three circles and I use regionprops() to detect them. I find the radii and centers of the circles, but that is not enough. To illustrate my circles I use viscircles(), but I would like to save the periphery of the circles for later use. I cannot see that regionprops() let me find this property of the circles, and I would like some tips or solution on this problem.
Regards, Katrine
  2 个评论
Ameer Hamza
Ameer Hamza 2020-4-22
regionprops already gives the center and radius of the circle? How else do you want to save the periphery?
KatherineL
KatherineL 2020-4-22
I would like to save all the points on the periphery which I want to use later. For instance save the coordinates of the circle viscircles() draw and use them.

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回答（2 个）

Ameer Hamza
Ameer Hamza 2020-4-22
You can calculate the coordinates on the periphery of a circle given the center and radius using these equations
center = [1 2];
radius = 1;
theta = linspace(0, 2*pi, 100);
x = radius*cos(theta);
y = radius*sin(theta);
plot(x,y);
Image Analyst
Image Analyst 2020-4-22
Try bwboundaries:
boundaries = bwboundaries(binaryImage);
% Plot them.
hold on;
for k = 1 : length(boundaries)
thisBoundary = boundaries{k};
x = thisBoundary(:, 2);
y = thisBoundary(:, 1);
plot(x, y, 'r-', 'LineWidth', 2);
end

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