Emgu CV Library Documentation
cvEllipse Method (img, center, axes, angle, startAngle, endAngle, color, thickness, lineType, shift)
NamespacesEmgu.CVCvInvokecvEllipse(IntPtr, MCvPoint, MCvSize, Double, Double, Double, MCvScalar, Int32, LINE_TYPE, Int32)

www.emgu.com/wiki
Draws a simple or thick elliptic arc or fills an ellipse sector. The arc is clipped by ROI rectangle. A piecewise-linear approximation is used for antialiased arcs and thick arcs. All the angles are given in degrees.
Declaration Syntax
C#Visual BasicVisual C++
public static void cvEllipse(
	IntPtr img,
	MCvPoint center,
	MCvSize axes,
	double angle,
	double startAngle,
	double endAngle,
	MCvScalar color,
	int thickness,
	LINE_TYPE lineType,
	int shift
)
Public Shared Sub cvEllipse ( _
	img As IntPtr, _
	center As MCvPoint, _
	axes As MCvSize, _
	angle As Double, _
	startAngle As Double, _
	endAngle As Double, _
	color As MCvScalar, _
	thickness As Integer, _
	lineType As LINE_TYPE, _
	shift As Integer _
)
public:
static void cvEllipse(
	IntPtr img, 
	MCvPoint center, 
	MCvSize axes, 
	double angle, 
	double startAngle, 
	double endAngle, 
	MCvScalar color, 
	int thickness, 
	LINE_TYPE lineType, 
	int shift
)
Parameters
img (IntPtr)
Image
center (MCvPoint)
Center of the ellipse
axes (MCvSize)
Length of the ellipse axes
angle (Double)
Rotation angle
startAngle (Double)
Starting angle of the elliptic arc
endAngle (Double)
Ending angle of the elliptic arc
color (MCvScalar)
Ellipse color
thickness (Int32)
Thickness of the ellipse arc
lineType (LINE_TYPE)
Type of the ellipse boundary
shift (Int32)
Number of fractional bits in the center coordinates and axes' values

Assembly: Emgu.CV (Module: Emgu.CV) Version: 1.3.0.0 (1.3.0.0)