How to get the x and y points of a contour?

%this is the following code which creates a contour for the circle image %now i want the x and y points of that contour

1. I = imread('circle.jpg');
2. figure
3. imshow(I)
4. hold on;
5. mask = false(size(I));
6. mask(60:320,40:300) = true;
7. Display the initial contour on the original image in blue.
8. contour(mask,[0 0],'b');

Answer 1

[the cyclist]

From the documentation for contour() ...

"[C,h] = contour(...) returns a contour matrix, C, that contains the data that defines the contour lines, and a handle, h, to a contourgroup object. The clabel function uses contour matrix C to label the contour lines. ContourMatrix is also a read-only contourgroup property that you can obtain from the returned handle."

[Image Analyst]

We can't run this. Just attach your m-file and image. Make it easy for us to help you, not hard!