Returns matrix header for the input array that can be matrix - CvMat, image - IplImage or multi-dimensional dense array - CvMatND* (latter case is allowed only if allowND != 0) . In the case of matrix the function simply returns the input pointer. In the case of IplImage* or CvMatND* it initializes header structure with parameters of the current image ROI and returns pointer to this temporary structure. Because COI is not supported by CvMat, it is returned separately.

public static IntPtr cvGetMat(
	IntPtr arr,
	IntPtr header,
	out int coi,
	int allowNd
)

Public Shared Function cvGetMat ( 
	arr As IntPtr,
	header As IntPtr,
	<OutAttribute> ByRef coi As Integer,
	allowNd As Integer
) As IntPtr

public:
static IntPtr cvGetMat(
	IntPtr arr, 
	IntPtr header, 
	[OutAttribute] int% coi, 
	int allowNd
)

static member cvGetMat : 
        arr : IntPtr * 
        header : IntPtr * 
        coi : int byref * 
        allowNd : int -> IntPtr