Question

Using MATLAB (a) Write a computer program capable of zooming and shrinking an image by pixel replication. Assume that the desired zoom/shrink factors are integers.

Answer 1

`Hey,

Note: Brother if you have any queries related the answer please do comment. I would be very happy to resolve all your queries.

clc
clear all
close all
format long
name=input('Enter image name: ','s');
A=imread(name);
disp('Input Image ==> cameraman.tif');
f=input('Enter the shrinking factor of the image: ');
s=size(A);
s1=s/f;
k=1;
l=1;
for i=1:s1
for j=1:s1
B(i,j)=A(k,l);
l=l+f;
end
l=1;
k=k+f;
end
figure,imshow(A)
title('Original Image');
figure,imshow(B)
title('Shrinked Version');
% Zooming
  
f1=input('Enter the factor by which the image is to be Zoomed: ');
s2=s*f1;
k=1;
l=1;
for i=1:f1:s2
for j=1:f1:s2
C(i,j)= A(k,l);
l=l+1;
end
l=1;
k=k+1;
end
for (i=1:f1:s2)
for (j=2:f1:s2-1)
C(i,j)= [C(i,j-1)+ C(i, j+1)]*0.5;
end
end
for j=1:f1:s2
for i=2:f1:s2-1
C(i,j)=[C(i-1,j)+C(i+1,j)]*0.5;
end
end
for (i=2:f1:s2-1)
for (j=2:f1:s2-1)
C(i,j)= [C(i,j-1)+ C(i, j+1)]*0.5;
end
end
figure,imshow(C)
title('Zoomed Image')

Kindly revert for any queries

Thanks.