2.1.22.2.1.14 fft_2d_correlation

Description

Perform 2d correlation on real matrices basing FFT algorithm.

Syntax

int fft_2d_correlation( matrixbase & matSignal1, matrixbase & matSignal2, matrix & matCorrelation, bool bNormalize = true, bool bCircular = true )

Parameters

matSignal1

[Input] the real matrices, could be the same one as matSignal2

matSignal2

[Input] the real matrices, could be the same one as matSignal1

matCorrelation

[Output] the correlation matrix.

bNormalize

[Input] normalize corelation result to +/-1 range if true(by default)

bCircular

[Input] perform circular correlation if true(by default) or else linear correlation

Return

0 for success or error codes.

Examples

Prior to compilation, load fftEx_utils.c to the workspace by executing the following LabTalk command:

Run.LoadOC("Originlab\fftEx_utils.c", 16);

To retain fftEx_utils.c in the workspace for successive sessions, drag and drop the file from the Temporary folder to the System folder.

EX1

#include <fftex_utils.h>
void fft_2d_correlation_ex1()
{
    matrix sig1 = {{1, 0}, {0, 1}};
    matrix sig2 = {{0, 1}, {1, 0}};
    matrix result(2, 2);
    fft_2d_correlation(sig1, sig2, result);
    for (int ii=0; ii<2; ii++)
    {
        for (int jj=0; jj<2; jj++)
            printf ("%lf\t", result[ii][jj]);
        printf ("\n");
    }
}

Remark

See Also

correlation_2d_shift_accumulate

Header to Include

fftEx_utils.h

Reference