Returns the number of non-zero elements in arr: result = sumI arr(I)!=0 In case of IplImage both ROI and COI are supported.

public static int cvCountNonZero(
	IntPtr arr
)

Public Shared Function cvCountNonZero ( _
	arr As IntPtr _
) As Integer

public:
static int cvCountNonZero(
	IntPtr arr
)