How can I draw a circle in this image from the edges that I marked and calculate the angle from the circle like this ?

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wongsathorn pinwihok 2020-1-25

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https://ww2.mathworks.cn/matlabcentral/answers/501970-how-can-i-draw-a-circle-in-this-image-from-the-edges-that-i-marked-and-calculate-the-angle-from-the

编辑： Image Analyst 2020-1-26

采纳的回答： Image Analyst

I want to know the code. i'm not good at coding sir.Thankyou.

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Answer 1

Image Analyst 2020-1-26

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https://ww2.mathworks.cn/matlabcentral/answers/501970-how-can-i-draw-a-circle-in-this-image-from-the-edges-that-i-marked-and-calculate-the-angle-from-the#answer_412045

编辑：Image Analyst 2020-1-26

Assuming you have (x1, y1) on the left side and (x2, y2) on the right side, simply use plot

hold on;
xCenter1 = (x1+x2)/2;
yCenter1 = (y1+y2)/2;
plot(xCenter1, yCenter1, 'w.', 'MarkerSize', 30);
xCenter2 = (x3+x4)/2;
yCenter2 = (y3+y4)/2;
plot(xCenter2, yCenter2, 'w.', 'MarkerSize', 30);

To get the angle of the line, you can use atand2d(), something like

dx = xCenter2-xCenter1;
dy = yCenter2-yCenter1;
angle = atand2d(dy, dx);

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wongsathorn pinwihok 2020-1-26

编辑：wongsathorn pinwihok 2020-1-26

how can i define the 2 markers ? if i want to use this markers with every images like this .

Image Analyst 2020-1-26

编辑：Image Analyst 2020-1-26

What markers are you talking about? I assume you have the edge, which you can get from thresholding for the top and bottom left red X. The bottom right X shows up in the middle of skin. You should search Vision Bibliography for papers on feet or ankles. It is a list of all image processing articles.

Or you can use drawpoint() to have the user place them manually.

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