Machine Vision

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Explanation of CrossCorrelation.VI in Frequency Domain


I'm curious as to how the cross correlation vi works in the frequency domain. I understand with the direct method it is matching the pixels looking for the best correlation. Does it compare the power spectrum of the two images in the frequency domain? Is it possible to have a 'search area' in the frequency domain as is possible with the direct method? I'm interested in doing 2D cross correlation for image stitching and wanted to test out the speed of this system in the frequency domain, since it is considerably slow using the direct method.

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