Page 183 - Algorithm Collections for Digital Signal Processing Applications using MATLAB

172 Chapter 4

0’s, decide that the image is photographic image. Otherwise the image is
classified as photo realistic image.

8.2 M-program for Detecting Photo Realistic Images
Using ICA Basis

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photorealisticdetgv.m

k=1;
for i=1:1:20
s=strcat('C:\Documents and Settings\user1\Desktop\Photorealistic\',num2str(i),'.jpg');
for j=1:1:50
temp=imread(s);
temp=rgb2gray(temp);
temp=temp(101:1:200,101:1:200);
r1=round(rand*(size(temp,1)-8))+1;
r2=round(rand*(size(temp,2)-8))+1;
temp=reshape(temp(r1:1:r1+7,r2:1:r2+7),1,64);;
temp=double(temp);
A{k}=lpc(temp,16);
k=k+1;
end
end

temp=cell2mat(A');
temp=temp(:,2:1:17);
I=fastica(temp);
save I I

k=1 ;
for i=1:1:20
s=strcat('C:\Documents and Settings\user1\Desktop\Photorealistic\',num2str(i),'.jpg');
for j=1:1:100
temp=imread(s);
temp=rgb2gray(temp);
temp=temp(101:1:200,101:1:200);
r1=round(rand*(size(temp,1)-8))+1;
r2=round(rand*(size(temp,2)-8))+1;