MATLAB TUTORIAL THREE

Image Enhancement in spatial domain.

clc;

clear all;

close all;

I = imread('capture.jpg');

subplot(3,3,1)

imshow(I)

title('original image')

J = rgb2gray(I);

subplot(3,3,2)

imshow(J)

title('grayscale image of original image')

subplot(3,3,5);

imhist(J);

title('histogram of grayscale image')

F = histeq(J);

subplot(3,3,3),imshow(F)

title('histogram equalized grayscale image')

subplot(3,3,6),imhist(F)

title('histogram equalization graph of grayscale equlized image')

L = imadjust(J,[0.2;0.6],[0.2;0.5])

subplot(3,3,4),imshow(L)

title('grayscale image is adjsuted in some range')

subplot(3,3,7),imhist(L)

title('histogram of adjusted grayscale image')

K = imadjust(F,[0.2 ;0.3 ],[0.1 ; 0.4 ],0.8);

subplot(3,3,8),imshow(K)

title('grayscale image is adjsuted with some gamma value')

subplot(3,3,9),imhist(K)

title('histogram of gamma adjusted grayscale image')

close all;

clear all;

clc;

r = imread('flowers.jpg');

% r = imresize(a,[64 64]);

g = input('enter the value of gamma = ')

v = r.^g;

c = input('enter the value of constant multiplier = ')

s = c*(v);

size(r)

subplot(1,2,1)

imshow(r)

subplot(1,2,2)

imshow(s)

  

Output

enter the value of gamma = 3

g =  3

enter the value of constant multiplier = 2

c = 2

ans = 1600        2560           3

clear all;

close all;

clc;

a=imread('flowers.jpg');

a = imresize(a,[256 256])

a=double(a);

b1=[];

b2=[];

b3=[];

b4=[];

b5=[];

b6=[];

b7=[];

for m=1:256

for n=1:256

        b1(m,n)=ceil(a(m,n)/power(2,7))*power(2,7);

        b2(m,n)=ceil(a(m,n)/power(2,6))*power(2,6);

        b3(m,n)=ceil(a(m,n)/power(2,5))*power(2,5);

        b4(m,n)=ceil(a(m,n)/power(2,4))*power(2,4);

        b5(m,n)=ceil(a(m,n)/power(2,3))*power(2,3);

        b6(m,n)=ceil(a(m,n)/power(2,2))*power(2,2);

        b7(m,n)=ceil(a(m,n)/power(2,1))*power(2,1);

end

end

subplot(2,4,1);

imshow(uint8(a));

title('image of flowers','color','r');

subplot(2,4,2);

imshow(uint8(b7));

title('bit-7','color','r');

subplot(2,4,3);

imshow(uint8(b6));

title('bit-6','color','r');

subplot(2,4,4);

imshow(uint8(b5));

title('bit-5','color','r');

subplot(2,4,5);

imshow(uint8(b4));

title('bit-4','color','r');

subplot(2,4,6);

imshow(uint8(b3));

title('bit-3','color','r');

subplot(2,4,7);

imshow(uint8(b2));

title('bit-2','color','r');

subplot(2,4,8);

imshow(uint8(b1));

title('bit-1','color','r');  

B=imread('Audi A9_214.jpg');

A = rgb2gray(B)

subplot(3,3,1);imshow(A);title('grayscale image')

B=bitget(A,1);

subplot(3,3,2);imshow(logical(B));title('Bit plane 1');

B=bitget(A,3);

subplot(3,3,3);imshow(logical(B));title('Bit plane 2');

B=bitget(A,3);

subplot(3,3,4);imshow(logical(B));title('Bit plane 3');

B=bitget(A,4);

subplot(3,3,5);imshow(logical(B));title('Bit plane 4');

B=bitget(A,5);

subplot(3,3,6);imshow(logical(B));title('Bit plane 5');

B=bitget(A,6);

subplot(3,3,7);imshow(logical(B));title('Bit plane 6');

B=bitget(A,7);

subplot(3,3,8);imshow(logical(B));title('Bit plane 7');

B=bitget(A,8);

subplot(3,3,9);imshow(logical(B));title('Bit plane 8');