Normalized cross-correlation using the Fourier Transform
#include "dip_findshift.h"
dip_Error dip_CrossCorrelationFT ( in1, in2, out, in1rep, in2rep, outrep )
binary, integer, float, complex
This function calculates the cross-correlation between two images of equal size. The returned image is the cross-correlation normalized in such a way that only the phase information is of importance. This results as a very sharp peak in the spatial domain. This function performs out = (Conj(in1)*in2)/((Abs(in1))^2) in the Fourier domain. It is used by FindShift. The inrep, psfrep and outrep specify whether the images are spatial images (DIP_IMAGE_REPRESENTATION_SPATIAL) or their Fourier transform. (DIP_IMAGE_REPRESENTATION_SPECTRAL).
| Data type | Name | Description |
| dip_Image | in1 | Input image |
| dip_Image | in2 | Input image |
| dip_Image | out | Output image |
| dipf_ImageRepresentation | in1rep | Input 1 spatial or spectral |
| dipf_ImageRepresentation | in2rep | Input 2 spatial or spectral |
| dipf_ImageRepresentation | outrep | Output spatial or spectral |