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

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raheem mian el 25 de Mzo. de 2020

Comentada: raheem mian el 31 de Mzo. de 2020

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

David Goodmanson el 30 de Mzo. de 2020

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

raheem mian el 31 de Mzo. de 2020

To calculate a phase correlation

Bhargavi Maganuru el 31 de Mzo. de 2020

Editada: Bhargavi Maganuru el 31 de Mzo. de 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 el 31 de Mzo. de 2020

Editada: David Goodmanson el 31 de Mzo. de 2020

HI Bhargavi,

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

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