HPFAttack.m

clc;
close all;
clear all;
p=10;
chtimg=zeros(256,256);
notr=input('Enter no of traitors');
for i=1:notr
    traitor(i)=input('Enter Traitor');
end
ti=0
for m=1:p
    str = int2str(m);
    str = strcat('E:\M Tech\Semester 4\Project Work\Watermarked Images\',str,'.bmp');
    a = imread(str);
    b=size(a); 
    c=size(find(traitor-m));
    sizc=c(2);
        if (notr~=sizc)
           chtimg=chtimg+double(a/notr);
            ti=ti+1
        end    
        b=size(a);
        for i=1:(b(1)*b(2))
            db(i,m)=a(i);
        end
end
meanvector=mean(db,2);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%   Calculating mean centered images
for l=1:p;
    meancenter(1:b(1)*b(2),l)=double(db(1:b(1)*b(2),l))-meanvector(1:b(1)*b(2));
end
mc=meancenter';
H=fspecial('unsharp');
sharpenedimage=imfilter(chtimg,H,'replicate');
chtimg=sharpenedimage;
test=chtimg;
 for i=1:b(1)*b(2)
     testvector(i,1)=test(i);
 end
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %%Finding the mean centered test  image
 meancenttest=double(testvector)-meanvector;
 mct=meancenttest';
 A=db';
% e=0.1;
% beta=3;
% n=size(A,1);
% %k=achlioptasreduceddimension(n,e,beta);
% k=1500;
 d=size(A,2);
% R=achlioptasRandomMatrix(d,k);
% r=(1/sqrt(k))*R;
%load r
%load r1500;
%load MaximumAttack r
for t=1:10
k=1500;
  R=achlioptasRandomMatrix(d,k);
  r=(1/sqrt(k))*R;
%load r1500
projectedImages = [];
for i = 1 : p
    temp = mc(i,:)*r; % projection of centered images into facespace
    projectedImages = [projectedImages; temp]; 
 end

% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %%projecting the test image as span of eigen faces
 projectedTestImage = mct*r; % Test image feature vector
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %%Finding the eucledian distance between test image and data base images
 for i=1:p
     euc(i,t)=(norm(projectedImages(i,:)-projectedTestImage))^2;
 end
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
end
% %% Image with the minimum eucledian distance is the recognised image
eu=mean(euc,2);
eu./max(eu)
%  [mindis arg_min]=min(euc);
% % %%%%%%%%%%%%%%%%%%%%%%%%%%%
%  arg_min
%  mindis
%  figure;
%  imshow(uint8(test));
%  figure;
%  stem(euc);
%  imwrite(uint8(test),'chtimghpf.bmp','BMP');