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1/f amplitude frequency plot

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Ayesha Batool
Ayesha Batool 2019-2-5
I'm running an image analysis using fourier transform.
I want to use spectral amplitude as a measure of naturalness of an image.
It is said that the i/f amplitude-frequency scaling is modulated by the naturalness of scenes, with steeper slops for naturalistics compared to artifactual scenes.
I just want to run this in matlab and test on two images, naturalistic and artifactual to see how it is.
Please share a simple code to read an image and run this 1/f amplitude - frequency scaling.
I'm here so far:
clear all; close all; clc
imdata = imread('C:\....\ab.jpg');
figure(1);imshow(imdata); title('Original Image');
imdata = rgb2gray(imdata);
figure(2); imshow(imdata); title('Gray Image');
%get fourier transform of an image
F = fft2(imdata);
%fourier transform of an image
S = abs(F);
figure(3);imshow(S,[]);title('Fourier Transform of an Image');
%get the centered spectrium
Fsh = fftshift(F);
figure(4);imshow(abs(Fsh),[]);title('Centered Fourier Transform of Image')
%apply log transform
S2 = log(1+abs(Fsh));
figure(5);imshow(S2,[]);title('log transformed image')
%reconstruct our image
F = ifftshift(Fsh);
f =ifft2(F);
figure(6);imshow(f,[]),title('reconstruct image')
If I'm missing something, too, please explain how to go about it.

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