FFT(W) based functions

Detailed Description

Collaboration diagram for FFT(W) based functions:

Functions
template<class T1 , class T2 >
RES_T	correlation (Image< T1 > &imIn1, Image< T1 > &imIn2, Image< T2 > &imOut)
	2D image (normalized) cross correlation using FFT. More...

Function Documentation

correlation()

RES_T smil::correlation	(	Image< T1 > &	imIn1,
		Image< T1 > &	imIn2,
		Image< T2 > &	imOut
	)

2D image (normalized) cross correlation using FFT.

Input images must have same size.

Can be used to find a template image within a larger one:

correlation(sourceImg, templateImg, corrImg)
pt = IntPoint()
maxVal(corrImg, pt)
# gives the position of the template image within the source image
print pt.x, pt.y