The function cvSobel calculates the image derivative by convolving the image with the appropriate kernel: dst(x,y) = dxorder+yodersrc/dxxorder•dyyorder |(x,y) The Sobel operators combine Gaussian smoothing and differentiation so the result is more or less robust to the noise. Most often, the function is called with (xorder=1, yorder=0, aperture_size=3) or (xorder=0, yorder=1, aperture_size=3) to calculate first x- or y- image derivative.

IImage Sobel(
	int xorder,
	int yorder,
	int apertureSize
)

Function Sobel ( _
	xorder As Integer, _
	yorder As Integer, _
	apertureSize As Integer _
) As IImage

IImage^ Sobel(
	int xorder, 
	int yorder, 
	int apertureSize
)