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.

- Ask a user to choose a picture

- Ask the user to enter the factor

- The factor must be an integer

- Use if- statement it the user wants to zoom or shrink.

- Make the user re-enter if he/ she doesn't enter the factor number as an integer.

Answer 1

PLEASE REFER BELOW CODE

close all
clear all
clc

%taking image name as input
str = input('Enter image name : ', 's');
I = imread(str);

%display input image
imshow(I);
title('Input image');

go = true;
x=0;
%checking input factor should be integer
while go
    x = input('Input factor : ');
    if floor(x) == x
        break;
    else
        fprintf('Entered factor is not integer\n');
    end
end

%taking user input for zoom and shrink
oper = input('Enter\n 1. Zoom\n2. Shrink\n');

if oper == 1
    C = imresize(I, x); %zoom by x
    figure();
    imshow(C);
    title(['Image after zoom by factor ', num2str(x)]);
elseif oper == 2
    C = imresize(I, 1/x); %shrink by x
    figure();
    imshow(C);
    title(['Image after shrink by factor ', num2str(x)]);
else
    fprintf('\nInvalid input\n');
end

PLEASE REFER BELOW OUTPUT

Enter image name : cameraman.tif
Input factor : 0.3
Entered factor is not integer
Input factor : 9.3
Entered factor is not integer
Input factor : 5
Enter
1. Zoom
2. Shrink
1