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CvInvokeCornerSubPix Method
http://www.emgu.com
Iterates to find the sub-pixel accurate location of corners, or radial saddle points

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 CornerSubPix(
	IInputArray image,
	IInputOutputArray corners,
	Size win,
	Size zeroZone,
	MCvTermCriteria criteria
)

Parameters

image
Type: Emgu.CVIInputArray
Input image
corners
Type: Emgu.CVIInputOutputArray
Initial coordinates of the input corners and refined coordinates on output
win
Type: System.DrawingSize
Half sizes of the search window. For example, if win=(5,5) then 5*2+1 x 5*2+1 = 11 x 11 search window is used
zeroZone
Type: System.DrawingSize
Half size of the dead region in the middle of the search zone over which the summation in formulae below is not done. It is used sometimes to avoid possible singularities of the autocorrelation matrix. The value of (-1,-1) indicates that there is no such size
criteria
Type: Emgu.CV.StructureMCvTermCriteria
Criteria for termination of the iterative process of corner refinement. That is, the process of corner position refinement stops either after certain number of iteration or when a required accuracy is achieved. The criteria may specify either of or both the maximum number of iteration and the required accuracy
See Also