Emgu CV Library Documentation
cvLaplace Method (src, dst, aperture_size)
NamespacesEmgu.CVCvInvokecvLaplace(IntPtr, IntPtr, Int32)

www.emgu.com/wiki
Calculates Laplacian of the source image by summing second x- and y- derivatives calculated using Sobel operator: dst(x,y) = d2src/dx2 + d2src/dy2 Specifying aperture_size=1 gives the fastest variant that is equal to convolving the image with the following kernel: |0 1 0| |1 -4 1| |0 1 0| Similar to cvSobel function, no scaling is done and the same combinations of input and output formats are supported.
Declaration Syntax
C#Visual BasicVisual C++
public static void cvLaplace(
	IntPtr src,
	IntPtr dst,
	int aperture_size
)
Public Shared Sub cvLaplace ( _
	src As IntPtr, _
	dst As IntPtr, _
	aperture_size As Integer _
)
public:
static void cvLaplace(
	IntPtr src, 
	IntPtr dst, 
	int aperture_size
)
Parameters
src (IntPtr)
Source image.
dst (IntPtr)
Destination image.
aperture_size (Int32)
Aperture size

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