How much should you zero pad an image before taking the fft ?

5 vues (au cours des 30 derniers jours)

raheem mian le 25 Mar 2020

Commenté : raheem mian le 31 Mar 2020

If i have an image that is 200x200 and I want to take the FFT how much zero padding is required ?

David Goodmanson le 30 Mar 2020

Hi raheem, for what purpose might you want to use zero padding?

raheem mian le 31 Mar 2020

To calculate a phase correlation

Bhargavi Maganuru le 31 Mar 2020

Modifié(e) : Bhargavi Maganuru le 31 Mar 2020

If input signal of fft is not in the powers of 2, which is 200 in your case so, you can do zero padding till length is 256.

David Goodmanson le 31 Mar 2020

Modifié(e) : David Goodmanson le 31 Mar 2020

HI Bhargavi,

could you explain why going to a power of 2 is a good idea, or not?

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