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Altera_Forum's avatar
Altera_Forum
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16 years ago

IFFT odd behavior

I'm at the tail end of a design that uses 2D FFTs, does phase correlation calculation in frequency domain then does 2D Inverse FFT to get spatial shift between two images. I'm finding that the ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

sounds like a DC offset issue caused by fixed point truncation after the FFT but before the IFFT. going FFT => IFFT directly and see if there is a spike at the origin.