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I've struct with Ellipse Equation: Ax^2 + Bxy + Cy^2 + Dx + Ey + F = 0

struct MyEllipse{ double A, B, C, D, E, F };

Here is the example of my metadata of detected ellipses ----- METADATA OF DETECTED ELLIPSES ----- Ellipse Equation: Ax^2 + Bxy + Cy^2 + Dx + Ey + F = 0

EllipseID | A | B | C | D | E | F | 0 6,262e-7 1,371e-9 2,041e-7 -3,583e-4 -8,804e-4 1,000e+0 1 6,808e-7 -3,807e-9 2,138e-7 -1,293e-4 -9,215e-4 1,000e+0 2 1,465e-6 7,364e-9 4,929e-7 -3,131e-4 -1,393e-3 1,000e+0

The question is How to draw these ellipses via OpenCV ellipse() method? I think openCV ellipse() method use these parameters :

img – Image. center – Center of the ellipse. axes – Length of the ellipse axes. angle – Ellipse rotation angle in degrees. startAngle – Starting angle of the elliptic arc in degrees. endAngle – Ending angle of the elliptic arc in degrees. box – Alternative ellipse representation via RotatedRect or CvBox2D. This means that the function draws an ellipse inscribed in the rotated rectangle. color – Ellipse color. thickness – Thickness of the ellipse arc outline, if positive. Otherwise, this indicates that a filled ellipse sector is to be drawn. lineType – Type of the ellipse boundary. See the line() description. shift – Number of fractional bits in the coordinates of the center and values of axes.

but i don't have these parameters :( I've just you know upper struct Ax^2 + Bxy + Cy^2 + Dx + Ey + F = 0 with struct MyEllipse{ double A, B, C, D, E, F };

Please somebody help me?

user2563982
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  • Your question is mathematical. You need to find the center(x,y), the size(a,b) and the rotation(r), in order to use cvellipse. – LovaBill Jul 09 '13 at 10:22
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    +1. Here is the [link](http://answers.yahoo.com/question/index?qid=20070301184409AAXPGhg) for the formulas. – baci Jul 09 '13 at 10:36

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