CODEWITHSUNDEEP
opencvdrawing
user1068636
user1068636

Reputation: 1939

How do you determine the center coordinate of an ellipse drawn using openCV?

On line 151 in this program it draws an ellipse: 

ellipse( image, trackBox, Scalar(0,0,255), 3, CV_AA );

How do I figure the center coordinate of the ellipse that was drawn after line 151?

According to this page an ellipse has a "center" property but I cannot figure out how to access it.

Would appreciate if someone can guide me how to get this center property.

Upvotes: 2

Views: 3435

Answers (2)

krzych
krzych

Reputation: 2176

Have you tried to check docs?

Ellipse is drawn with RotatedRect as you see in code. Here you have it: http://docs.opencv.org/modules/core/doc/basic_structures.html?highlight=rotatedrect#RotatedRect

RotatedRect has center. So just yourRectName.center

Upvotes: 2

G453
G453

Reputation: 1456

the "trackBox" in the code is

RotatedRect

class object type. So you can access the center co ordinates by the following way

trackBox.center.x 
trackBox.center.y

Add the following line of code after the line number 151 and see the center for visualization

ellipse( image, trackBox, Scalar(0,0,255), 3, CV_AA );
circle(image,trackBox.center,5,Scalar(0,255,0));

Upvotes: 3

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