AlgCorr

Files
file	AlgAutoCorr.c
	Frequency domain auto correlation functions.
file	AlgCrossCorr.c
	Frequency domain cross correlation functions.

Functions
AlgError	AlgCrossCorrelate2D (double **data0, double **data1, int nX, int nY)
	Cross correlates the given 2D double arrays leaving the result in the first of the two arrays. The cross correlation data are un-normalized. More...
void	AlgCrossCorrPeakXY (int *dstMaxX, int *dstMaxY, double *dstMaxVal, double **data, int nX, int nY, int searchX, int searchY)
	Find the maximum correlation value in the given two dimensional array. Because the correlation data are stored in wrap-around order and the maximum is known to lie within a limited search range, only the four corners of the array are searched. More...

Detailed Description

Function Documentation

AlgCrossCorrelate2D()

AlgError AlgCrossCorrelate2D	(	double **	data0,
		double **	data1,
		int	nX,
		int	nY
	)

Cross correlates the given 2D double arrays leaving the result in the first of the two arrays. The cross correlation data are un-normalized.

Returns

Error code.

Parameters

data0	Data for/with obj0's FFT (source: AlcDouble2Malloc) which holds the cross correlation data on return.
data1	Data for/with obj1's FFT (source: AlcDouble2Malloc).
nX	Number of columns in each of the data arrays.
nY	Number of lines in each of the data arrays.

References ALG_ERR_FUNC, ALG_ERR_NONE, AlgBitNextPowerOfTwo(), AlgFourReal2D(), and AlgFourRealInv2D().

AlgCrossCorrPeakXY()

void AlgCrossCorrPeakXY	(	int *	dstMaxX,
		int *	dstMaxY,
		double *	dstMaxVal,
		double **	data,
		int	nX,
		int	nY,
		int	searchX,
		int	searchY
	)

Find the maximum correlation value in the given two dimensional array. Because the correlation data are stored in wrap-around order and the maximum is known to lie within a limited search range, only the four corners of the array are searched.

Returns

void

Parameters

dstMaxX	Destination ptr for column coordinate with maximum value.
dstMaxY	Destination ptr for line coordinate with maximum value.
dstMaxVal	Destination ptr for maximum value.
data	Data to search for maximum.
nX	Number of colimns in data.
nY	Number of lines in data.
searchX	Maximum number of columns to search.
searchY	Maximum number of lines to search.