[scilab-Users] 2-D Fourier Transform?

[ray joseph]

I am sorry that I can not offer a direct scilab review but in general, the
Fourier transform can have complex results.  Rather than square, multiply by
the complex conjegate.  But you might first look at your resultant data and
see if there is complex components.  Additionally, consider using test
images rather than real images.  An example test image would be a one
dimensional sinusoidal gradient, f(x,y) = 1+sin(a*x).

Ray 

-----Original Message-----
From: hadi motamedi [mailto:motamedi24 at gmail.com] 
Sent: Wednesday, November 10, 2010 1:22 AM
To: users
Subject: [scilab-Users] 2-D Fourier Transform?

Dear All
To get 2-D Fourier transform from my image , I tried as :
->im=imread("image.png");
->img=rgb2gray(im);
->imd=im2double(img);
->size(imd)
->yf=fft2(imd,1024,768);
->yfa=abs(yf);
->yfs=yfa.^2;
At this point , I tried to make plots of it by using surf(yfa) or
Matplot(yfs) but none of them resulted to meaningful drawings. Can you
please let me know how can I obtain meaningful graphs for this purpose?
Thank you