MAT-LAB Image Processing, Basic Image Operations

MAT-LAB BASIC IMAGE OPERATIONS

Image Addition

%Adding constant to image, using inbuilt function

img = imread('face.tif');

img1 = imadd(img,128);

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

title('Original');

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

title('Inbuilt function added 128');

%Manually

img2 = img;

for i=1:size(img)

for j=1:size(img)

img2(i,j) = img(i,j)+64;

end

end

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

title('Manually added 64');

%Adding two images of same size 300x300

img3 = rgb2ind(imread('pattern.tiff'),0);

img4 = uint8(zeros(300,300));

for i=1:size(img)

for j=1:size(img)

img4(i,j) = img(i,j)+img3(i,j);

end

end

%img4 = img+img3; even this works

subplot(2,3,4), imshow(img);

title('Original image1');

subplot(2,3,5), imshow(img3);

title('Original image2');

subplot(2,3,6), imshow(img4);

title('Effect of adding image1 and image2');

Image Subtraction

%Subtracting constant to image, using inbuilt function

img = imread('face.tif');

img1 = imsubtract(img,128);

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

title('Original');

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

title('Inbuilt function subtracted 128');

%Manually

img2 = img;

for i=1:size(img)

for j=1:size(img)

img2(i,j) = img(i,j)-64;

end

end

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

title('Manually subtracted 64');

%Subtracting two images of same size 300x300

img3 = imread('pattern4.tif');

img4 = uint8(zeros(300,300));

for i=1:size(img)

for j=1:size(img)

img4(i,j) = img(i,j)-img3(i,j);

end

end

%img4 = img3 - img;

subplot(2,3,4), imshow(img);

title('Original image1');

subplot(2,3,5), imshow(img3);

title('Original image2');

subplot(2,3,6), imshow(img4);

title('Effect of subtracting image 1 and 2');

Image Division

%Divide image by 128, using inbuilt function

img = imread('face.tif');

img1 = imdivide(img,2);

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

title('Original');

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

title('Inbuilt function divided by 2');

%Manually

img2 = zeros(300,300);

for i=1:size(img)

for j=1:size(img)

img2(i,j) = img(i,j)/128;

end

end

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

title('Manually divided by 128');

%Dividing two images of same size 300x300

img3 = imread('pattern3.tif');

img4 = zeros(300,300);

for i=1:size(img)

for j=1:size(img)

img4(i,j) = img(i,j)/img3(i,j);

end

end

%img4 = img3 - img;

subplot(2,3,4), imshow(img);

title('Original image1');

subplot(2,3,5), imshow(img3);

title('Original image2');

subplot(2,3,6), imshow(img4);

title('Effect of dividing image1 by image2');

Image Multiplication

%Multiply image by 8, using inbuilt function

img = imread('face.tif');

img1 = immultiply(img,4);

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

title('Original');

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

title('Inbuilt function multiplied by 4');

%Manually

img2 = uint8(zeros(300,300));

for i=1:size(img)

for j=1:size(img)

img2(i,j) = img(i,j)*0.5;

end

end

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

title('Manually multiplied by 0.5');

%Multiplying two images of same size 300x300

img3 = uint8(ones(300,300));

for i=1:300

for j=1:300

img3(i+(i-1),j+(j-1))=2;

end

end

img4 = uint8(zeros(300,300));

for i=1:size(img)

for j=1:size(img)

img4(i,j) = img(i,j)*img3(i,j);

end

end

%img4 = img3 - img;

subplot(2,3,4), imshow(img);

title('Original image1');

subplot(2,3,5), imshow(img3);

title('Original image2');

subplot(2,3,6), imshow(img4);

title('Effect of multiplying image1 and image2');

Logical AND

%Logical AND operation

A = imread('logical1.tif');

A = logical(A);

B = imread('logical2.tif');

B = logical(B);

C = A & B;

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

title('Original Image 1');

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

title('Original Image 2');

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

title('Effect of Logical AND');

D = logical(imread('logical3.tif'));

E = A & D;

subplot(2,3,4), imshow(A);

title('Original Image 1');

subplot(2,3,5), imshow(D);

title('Original Image 3');

subplot(2,3,6), imshow(E);

title('Effect of Logical AND');

%***********************************************

%Applications are in Object movement detection

Logical OR

% Image Logical OR

A = imread('logical4.tif');

A = logical(A);

B = imread('logical5.tif');

B = logical(B);

C = A | B;

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

title('Original Image 1');

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

title('Original Image 2');

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

title('Effect of Logical OR');

D = logical(imread('logical6.tif'));

E = logical(imread('logical7.tif'));

F = D | E;

subplot(2,3,4), imshow(D);

title('Original Image 3');

subplot(2,3,5), imshow(E);

title('Original Image 4');

subplot(2,3,6), imshow(F);

title('Effect of Logical OR');

%Pattern analysis