Could be 5x5..21x21. Correspondence using Sum of Absolute Difference (SAD):

Namespace:  Emgu.CV.Structure
Assembly:  Emgu.CV (in Emgu.CV.dll) Version: 2.1.0.649 (2.1.0.649)

Syntax

         
 C#  Visual Basic  Visual C++ 
public int SADWindowSize
Public SADWindowSize As Integer
public:
int SADWindowSize

See Also