Emgu CV Library Documentation
cvSetImageCOI Method (image, coi)
NamespacesEmgu.CVCvInvokecvSetImageCOI(IntPtr, Int32)

www.emgu.com/wiki
Sets the channel of interest to a given value. Value 0 means that all channels are selected, 1 means that the first channel is selected etc. If ROI is NULL and coi != 0, ROI is allocated.
Declaration Syntax
C#Visual BasicVisual C++
public static void cvSetImageCOI(
	IntPtr image,
	int coi
)
Public Shared Sub cvSetImageCOI ( _
	image As IntPtr, _
	coi As Integer _
)
public:
static void cvSetImageCOI(
	IntPtr image, 
	int coi
)
Parameters
image (IntPtr)
Image header.
coi (Int32)
Channel of interest.

Assembly: Emgu.CV (Module: Emgu.CV) Version: 1.5.0.0 (1.5.0.0)