Emgu CV Library Documentation
cvFindNearestPoint2D Method (subdiv, pt)
NamespacesEmgu.CVCvInvokecvFindNearestPoint2D(IntPtr, MCvPoint2D32f)

www.emgu.com/wiki
Locates input point within subdivision. It finds subdivision vertex that is the closest to the input point. It is not necessarily one of vertices of the facet containing the input point, though the facet (located using cvSubdiv2DLocate) is used as a starting point.
Declaration Syntax
C#Visual BasicVisual C++
public static IntPtr cvFindNearestPoint2D(
	IntPtr subdiv,
	MCvPoint2D32f pt
)
Public Shared Function cvFindNearestPoint2D ( _
	subdiv As IntPtr, _
	pt As MCvPoint2D32f _
) As IntPtr
public:
static IntPtr cvFindNearestPoint2D(
	IntPtr subdiv, 
	MCvPoint2D32f pt
)
Parameters
subdiv (IntPtr)
Delaunay or another subdivision
pt (MCvPoint2D32f)
Input point
Return Value
pointer to the found subdivision vertex (CvSubdiv2DPoint)

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