MATLAB Answers

How to plot a circle on top of my plotted image

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Ruben Alfaro
Ruben Alfaro 9 May 2014
답변: Image Analyst 9 May 2014
I have an image plotted and I wanted to plot a circle on top of it with the same centroid of the image.
I want the radius to be 500 and I want it done with a red color, of somebody could help me with this.
thank you very much

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답변(3개)

lvn
lvn 9 May 2014
To plot on top of an existing figure, start with
hold on

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Ruben Alfaro
Ruben Alfaro 9 May 2014
Thank you,
But it doesnt seem to work for me, maybe im doing something wrong. can somebody help me figure it out or recommend another way of doing this?

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Roberto
Roberto 9 May 2014
post the error you're having, or explain why it doesn't work for you?

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Image Analyst
Image Analyst 9 May 2014
Try this:
grayImage = imread('concordorthophoto.png');
imshow(grayImage);
axis on;
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);
[rows, columns, numberOfColorChannels] = size(grayImage);
hold on; % Don't let plot blow away the image.
xCenter = columns / 2;
yCenter = rows / 2;
theta = 0 : 0.01 : 2*pi;
radius = 500;
x = radius * cos(theta) + xCenter;
y = radius * sin(theta) + yCenter;
plot(x, y, 'r-', 'LineWidth', 3);
grid on;

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