Emgu CV Library Documentation
HoughCircles Method (cannyThreshold, accumulatorThreshold, dp, minDist, minRadius, maxRadius)
NamespacesEmgu.CVImage<(Of <(TColor, TDepth>)>)HoughCircles(TColor, TColor, Double, Double, Int32, Int32)

www.emgu.com/wiki
First apply Canny Edge Detector on the current image, then apply Hough transform to find circles
Declaration Syntax
C#Visual BasicVisual C++
public Circle<float>[][] HoughCircles(
	TColor cannyThreshold,
	TColor accumulatorThreshold,
	double dp,
	double minDist,
	int minRadius,
	int maxRadius
)
Public Function HoughCircles ( _
	cannyThreshold As TColor, _
	accumulatorThreshold As TColor, _
	dp As Double, _
	minDist As Double, _
	minRadius As Integer, _
	maxRadius As Integer _
) As Circle(Of Single)()()
public:
array<array<Circle<float>^>^>^ HoughCircles(
	TColor cannyThreshold, 
	TColor accumulatorThreshold, 
	double dp, 
	double minDist, 
	int minRadius, 
	int maxRadius
)
Parameters
cannyThreshold (TColor)
The higher threshold of the two passed to Canny edge detector (the lower one will be twice smaller).
accumulatorThreshold (TColor)
Accumulator threshold at the center detection stage. The smaller it is, the more false circles may be detected. Circles, corresponding to the larger accumulator values, will be returned first
dp (Double)
Resolution of the accumulator used to detect centers of the circles. For example, if it is 1, the accumulator will have the same resolution as the input image, if it is 2 - accumulator will have twice smaller width and height, etc
minDist (Double)
Minimum distance between centers of the detected circles. If the parameter is too small, multiple neighbor circles may be falsely detected in addition to a true one. If it is too large, some circles may be missed
minRadius (Int32)
Minimal radius of the circles to search for
maxRadius (Int32)
Maximal radius of the circles to search for
Return Value

[Missing <returns> documentation for M:Emgu.CV.Image`2.HoughCircles(`0,`0,System.Double,System.Double,System.Int32,System.Int32)]

Assembly: Emgu.CV (Module: Emgu.CV) Version: 1.4.3249.6313 (1.4.0.0)