Question

in mathlab

1. Take two color images of same size

Write the coding to perform the following operations

1. Image addition
2. Image subtraction
3. Image multiplication
4. Image division

Answer 1

Syntax :

1)  subplot(numberOfRows, numberOfColumns, indexToBeDisplayedAt),imshow(imageName);

This will plot the image on the figure

example --> subplot(2,2,3),imshow(image);  Displaying canvas will have 2 rows, 2 columns and image will be displayed on 2nd row 1st column

2) % preceding a line comments the line. Just remove the % sign run the alternative code that has been provided in the solution.

3) img = Imread('imageName') -> Reads the image and stores the matrix by the variable name img.

Caution -> if image doesn't exist in directory/folder of the coding file, you will have to specify the relative path.

example - if folder1 contains folder2 and soccer.jpg and folder2 contains the Matlab file in which you are coding then :-

img1 = imread('../soccer.jpg');

else if folder2 contains both Matlab coding file and soccer.jpg, then :-

img2 = imread('soccer.jpg').

Matlab Code

img1 = imread('rice.png');

img2 = imread('cameraman.tif');

subplot(3,2,1),imshow(img1);

subplot(3,2,2),imshow(img2);

%Arithmetic operations work well as 16 bit operations

img1 = uint16(img1);

img2 = uint16(img2);

% % Adding images

%Using Library Function

img31 = imadd(img1,img2);

subplot(3,2,3),imshow(img31,[]);

% Self coded

img32 = img1 + img2;

% subplot(3,2,3),imshow(img32,[]);

% % Subtracting images

%Using Library Function

img41 = imsubtract(img1,img2);

subplot(3,2,4),imshow(img41,[]);

% Self coded

img42 = img1 - img2;

% subplot(3,2,4),imshow(img42,[]);

% % Multiplying images

img51 = immultiply(img1,img2);

subplot(3,2,5),imshow(img51,[]);

% % Dividing images

%Using Library Function

img61 = imdivide(img1,img2);

subplot(3,2,6),imshow(img61,[]);

% Self coded

img62 = img1./img2;

% subplot(3,2,6),imshow(img62,[]);

Output looks like this