www.emgu.com/wiki Find the edges on this image and marked them in the returned image.

Declaration Syntax
public Image<TColor, TDepth> Canny(
TColor thresh,
TColor threshLinking
)
Public Function Canny ( _
thresh As TColor, _
threshLinking As TColor _
) As Image(Of TColor, TDepth)
public:
Image<TColor, TDepth>^ Canny(
TColor thresh,
TColor threshLinking
)

Parameters
- thresh (TColor)
- The threshhold to find initial segments of strong edges
- threshLinking (TColor)
- The threshold used for edge Linking

Return Value
The edges found by the Canny edge detector
Assembly:
Emgu.CV (Module: Emgu.CV) Version: 1.3.0.0 (1.3.0.0)