How to convert color image to binary image in Matlab

How to convert color image to binary image in Matlab

Digital Computers are being applied to the variety of applications because they can be programmed to handle almost any computational problem. Computer Imaging deals with interpreting images in a useful image, that is actually application dependent. A subset of Physical images (Color Images) is multi-spectral images-those having more than one local property defined at each point (trispectral-RGB image, reproduced in color photography,). Black and white image has one value of brightness at each point, the color image has three values of brightness, one each for Red, Green, and Blue. The three values represent intensity in different spectral bands, which the eye perceives as different colors. Each Pixel requires 8 bits to show gray level range from 0-255. Normal Gray Level image contains 8 bits per pixel, but in binary Image, we represent image with 2 bits per pixel ( 0 OR 1)

Follow these steps to make Program for conversion of Color Image to Gray Level Image without Matlab built-in function with GUI

  1. Run Matlab, First window you will get something like below
Matlab Main Window
Matlab Main Window

2. Type “guide” in command window, “GUIDE Quick Start” window will appear

3. Select “Blank GUI (Default)” and press Okay, see in below picture

GUI in matalb
GUI in Matlab

4. In GUI window select “Static Text”  from left sidebar then double click on “Static Text”

5. “Inspector window” will appear, Type your desired Text in String Field

6. Then drag a “Button” from sidebar and Rewrite desired text, GUI will look like below picture

binaryImageGUI
Binary Image GUI

7. Save GUI with “Ctrl + S” then write code for color to grayscale conversion after pushbutton1_Callback

function varargout = GUI(varargin)
% GUI MATLAB code for GUI.fig
% GUI, by itself, creates a new GUI or raises the existing
% singleton*.
%
% H = GUI returns the handle to a new GUI or the handle to
% the existing singleton*.
%
% GUI(‘CALLBACK’,hObject,eventData,handles,…) calls the local
% function named CALLBACK in GUI.M with the given input arguments.
%
% GUI(‘Property’,’Value’,…) creates a new GUI or raises the
% existing singleton*. Starting from the left, property value pairs are
% applied to the GUI before GUI_OpeningFcn gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed to GUI_OpeningFcn via varargin.
%
% *See GUI Options on GUIDE’s Tools menu. Choose “GUI allows only one
% instance to run (singleton)”.
%
% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help GUI

% Last Modified by GUIDE v2.5 22-Apr-2017 21:51:20

% Begin initialization code – DO NOT EDIT
gui_Singleton = 1;
gui_State = struct(‘gui_Name’, mfilename, …
‘gui_Singleton’, gui_Singleton, …
‘gui_OpeningFcn’, @GUI_OpeningFcn, …
‘gui_OutputFcn’, @GUI_OutputFcn, …
‘gui_LayoutFcn’, [] , …
‘gui_Callback’, []);
if nargin && ischar(varargin{1})
gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
[varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
gui_mainfcn(gui_State, varargin{:});
end
% End initialization code – DO NOT EDIT

% — Executes just before GUI is made visible.
function GUI_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject handle to figure
% eventdata reserved – to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% varargin command line arguments to GUI (see VARARGIN)

% Choose default command line output for GUI
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes GUI wait for user response (see UIRESUME)
% uiwait(handles.figure1);

% — Outputs from this function are returned to the command line.
function varargout = GUI_OutputFcn(hObject, eventdata, handles)
% varargout cell array for returning output args (see VARARGOUT);
% hObject handle to figure
% eventdata reserved – to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure
varargout{1} = handles.output;

% — Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton1 (see GCBO)
% eventdata reserved – to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
[Filename Path] = uigetfile({‘*.*’},’File Selector’);
FullFilePath = strcat(Path,Filename);
Matrix = imread(FullFilePath);
[width, height,d] = size(Matrix);
greyImage = rgb2gray(Matrix);
processedImage = zeros(width,height);
Red = Matrix(:,:,1);
Green = Matrix(:,:,2);
Blue = Matrix(:,:,3);

for col = 1: 1: width
for row = 1 : 1 : height

if(greyImage(col,row) > 128)
processedImage(col,row) = 1;
else
processedImage(col,row) = 0;
end

end
end

figure,imshow(Matrix),title(‘Original Image’);
figure,imshow(processedImage),title(‘Processed Image’);

Input Image:

Color Image
Color Image

Processed Image:

Lenna Binary Image
Binary Image
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