Fourier Transform In matlab

Hello every one..

I am confused on a one question of my assignment which is on fourier transformation.Can anyone help me plz?The question is

1) Use lena image (f(i,j)). Calculate F(u-N/2,v-N/2). Plot|F(u-N/2,v-N/2)|. Reverse the magnitude of FT properly so that the resultant image is not too dark.

I am waiting for this answer. Can any one here o help me with a complete code? Thanks

[Wayne King]

In addition to just telling you to look at the help fft2()? You want somebody to "help" you by writing the complete answer to your assignment?

[Algorithms Analyst]

thank you Mr Wayne.I need some to to help me out from this question.This is soo confusing u know.I Know how to transfor image into fourier trnasform and I also know that how to find the magnitude and phase of the image using matlab.But still confuse how to solve it.Can you please send proper solution of this question.I didnot get any feedback from fft2. coz they are just using fourier transformation. Thanks

Answer 1

[Rick Rosson]

   >> doc fftshift

[Algorithms Analyst]

WHat is this?doc fftshift.I know fftshift will bring the image into center but what is doc fftshift.?

[Rick Rosson]

If you already know what fftshift does, and you already know how to use fft2, then what else do you need to know?

If you don't know what the doc command does, why don't you just try it?

[Algorithms Analyst]

Thanks Rosson for your help.