MATLAB CODES - Red Chaneel Image ,Quantized image with 4 bits , Synthetic Image ,Pseudocolor image , Grey image -8bits

clc

close all

% Read the colour image and resize it to 256 x 256

myimage = imread('zoo1.jpg');

mycolourimage = imresize(myimage,[256,256],'nearest');

%Display the Colour Image

subplot(2, 4, 1);

subimage(mycolourimage), title('Original colour image');

axis off; axis equal;

% Extract the Red band from the colour image

myredimage = mycolourimage(:, :, 1);

subplot(2, 4, 2);

subimage(myredimage); title('Red channel');

axis off; axis equal;

% Display the histogram of the Red channel

subplot(2, 4, 3);

imhist(myredimage); title('Red channel');

axis off; 

%Convert the colour image to Grey level image

mygrayimage = rgb2gray(mycolourimage);

subplot(2, 4, 4);

subimage(uint8(mygrayimage)), title('Grey image-8 bits');

axis off; axis equal;

% Resolution demo

% let us convert mygrayimage to 8-bit image for resolution demo

% Reduce the resolution to 8 X 8

myreducedimg = uint8(mygrayimage);

myreducedresolutionimg = imresize(imresize(myreducedimg,1/16),16);

subplot(2, 4,5);

subimage(myreducedresolutionimg), title('resolution now 16 x 16');

axis off; axis equal;

% Quantization demo

% let us convert mygrayimage to 8-bit image for resolution demo

% Reduce the resolution to 8 X 8

subplot(2,4,6);

subimage(grayslice(myreducedimg,2),gray(2));

title('Quantized image with 4 bits');

axis off; axis equal;

% generate a syntheic Image

% Matlab command phantom is used to generate a 64 x 64 image

subplot(2, 4, 7);

p = phantom('Modified Shepp-Logan',64);

subimage(p), title('Synthetic image'); 

axis off; axis equal;

%Display the grey level image using Pesudocolour using colormap(Jet(256)).

% This is the default colour map used to display the pesudocolour image

subplot(2, 4, 8);

subimage(mygrayimage,colormap(jet(256))), title('Pseudocolour image'); 

axis off; axis equal;