psnr_roubst.m

matlab code for spread spectrumusing M george algo

axis on;
axis([0 50 -30 80])

clc
clear a
org=imread('lena.jpg');
%wat=imread('lena_wat.bmp');
[rowr colr]=size(org);
k=1;
for i=1:15
    wat=ss_pnf(org,s,i);
    a(k)=psnr_cal(org,wat,rowr,colr);
    k=k+1  ;
end
plot(a,'r.:','LineWidth',3.0,'MarkerSize',4)
hold on
plot(b,'b.:','LineWidth',2.0,'MarkerSize',4)
hold off
axis([0 50 -30 80])


title('\bfPSNR vs ALPHA');
xlabel('\fontsize{15}ALPHA');
ylabel('\fontsize{15}PSNR');
legend('\fontsize{15}ss');
hold on;
for i=1:15
    b(i)=25;
end

grid on;
clear org
clear wat
clear rowr
clear colr
clear k