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CvInvokeCanny Method
http://www.emgu.com
Finds the edges on the input image and marks them in the output image edges using the Canny algorithm. The smallest of threshold1 and threshold2 is used for edge linking, the largest - to find initial segments of strong edges.

Namespace: Emgu.CV
Assembly: Emgu.CV.World (in Emgu.CV.World.dll) Version: 3.1.0.2282 (3.1.0.2282)
Syntax
public static void Canny(
	IInputArray image,
	IOutputArray edges,
	double threshold1,
	double threshold2,
	int apertureSize = 3,
	bool l2Gradient = false
)

Parameters

image
Type: Emgu.CVIInputArray
Input image
edges
Type: Emgu.CVIOutputArray
Image to store the edges found by the function
threshold1
Type: SystemDouble
The first threshold
threshold2
Type: SystemDouble
The second threshold.
apertureSize (Optional)
Type: SystemInt32
Aperture parameter for Sobel operator
l2Gradient (Optional)
Type: SystemBoolean
a flag, indicating whether a more accurate norm should be used to calculate the image gradient magnitude ( L2gradient=true ), or whether the default norm is enough ( L2gradient=false ).
See Also