Emgu CV Library Documentation
DCT Method (type)
NamespacesEmgu.CVIImageDCT(CV_DCT_TYPE)

www.emgu.com/wiki
performs forward or inverse transform of 2D floating-point image
Declaration Syntax
C#Visual BasicVisual C++
IImage DCT(
	CV_DCT_TYPE type
)
Function DCT ( _
	type As CV_DCT_TYPE _
) As IImage
IImage^ DCT(
	CV_DCT_TYPE type
)
Parameters
type (CV_DCT_TYPE)
Transformation flags
Return Value
The result of DCT

Assembly: Emgu.CV (Module: Emgu.CV) Version: 1.3.0.0 (1.3.0.0)