%--  4:27 PM 12/13/01 --%
  
x=imread('pattern.png');
imshow(x)
x=double(x);
n1 = 10*randn(size(x));
n2 = 10*randn(size(x));
n3 = 10*randn(size(x));
n4 = 10*randn(size(x));
imshow(n1,[])
x1 = x + n1;
x2 = x + n2;
x3 = x + n3;
x4 = x + n4;
imshow(x1,[])
figure,imshow(x2,[])
figure,imshow(x3,[])
figure,imshow(x4,[])
for k=1:4,figure(k),pause(1),end
for k=1:4,figure(k),pause(1),end
y1 = x1;
y2 = (x1+x2)/2;
y3 = (x1+x2+x3)/3;
y4 = (x1+x2+x3+x4)/4;
delfigs
imshow(y1,[])
figure,imshow(y2,[])
figure,imshow(y3,[])
figure,imshow(y4,[])
for m=1:5,for k=1:4,figure(k),pause(1),end,end
delfigs
tdemo
exit