Emgu CV Library Documentation
cvDFT Method (src, dst, flags, nonzeroRows)
NamespacesEmgu.CVCvInvokecvDFT(IntPtr, IntPtr, CV_DXT, Int32)

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Performs forward or inverse transform of 1D or 2D floating-point array In case of real (single-channel) data, the packed format, borrowed from IPL, is used to to represent a result of forward Fourier transform or input for inverse Fourier transform
Declaration Syntax
C#Visual BasicVisual C++
public static void cvDFT(
	IntPtr src,
	IntPtr dst,
	CV_DXT flags,
	int nonzeroRows
)
Public Shared Sub cvDFT ( _
	src As IntPtr, _
	dst As IntPtr, _
	flags As CV_DXT, _
	nonzeroRows As Integer _
)
public:
static void cvDFT(
	IntPtr src, 
	IntPtr dst, 
	CV_DXT flags, 
	int nonzeroRows
)
Parameters
src (IntPtr)
Source array, real or complex
dst (IntPtr)
Destination array of the same size and same type as the source
flags (CV_DXT)
Transformation flags
nonzeroRows (Int32)
Number of nonzero rows to in the source array (in case of forward 2d transform), or a number of rows of interest in the destination array (in case of inverse 2d transform). If the value is negative, zero, or greater than the total number of rows, it is ignored. The parameter can be used to speed up 2d convolution/correlation when computing them via DFT. See the sample below

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