power spectral density of image

Hallo every one i need your help please

i want to calculate the power spectral density of an image (my image size is 256*256 und their pixel values between 0 and 2^8=256). i did not find in matlab how to calculate that for an image?

thank you for your help.

Answer 1

[Vieniava]

Try this:

imagesc( log10(abs(fftshift(fft2(Picture))).^2 ))

[Sai Chandra Sekhar Reddy Nallamilli]

Yes thank you, it's working

[OLGA BARRERA]

Hi,

I am having problem with the power spectral density of this image (circ2.tif), this is a 1024*1024

A = imread('circ2.tif');

imagesc( log10(abs(fftshift(fft2(A))).^2 ))

I only get an emply windows..

Thank you in advance for your help

[Anitha Thomas]

OLGA BARRERA

change the code like this

A = imread('circ2.tif');

A1=rgb2gray(A);

imagesc( log10(abs(fftshift(fft2(A1))).^2 ))