how to plot frequency vs log intensity of a 2D image?

The graph should appear as shown in the figure given

[Thomas]

you have not attached any figures..

[Sansri Basu]

the output of the resultant image should appear as that shown in figure 1 and figure 2 of the paper in the link i have provided below:

www.klab.caltech.edu/~xhou/papers/cvpr07.pdf

Answer 1

[Image Analyst]

Call fft2 on your image. Take the real part or call abs(). Then take the log and call

imshow(logImage, []);

[Sansri Basu]

i tried this..... im=imread('filename.jpg'); logIm=log(abs(fft2(im))); imshow(logIm,[]); But it showed error!!!!!!!!!

[Image Analyst]

What error? It should work. Does this work for you?

grayImage = imread('cameraman.tif');
subplot(1,2,1);
imshow(grayImage);
axis on;
ft = fftshift(log(abs(fft2(grayImage))));
subplot(1,2,2);
imshow(ft, []);
axis on;

[Sansri Basu]

nop, itz only showing the original image, the graph is appearing blank!!!!!!!! please help!!!!!!!

[Image Analyst]

Sansri, I just copied and pasted and it worked fine. It produced this:

I don't know why you are expecting a graph. It makes an image, not a graph. What did you do to my code to make it not work? You must have done something else besides just copying and pasting that code.