Histogram Shrink in Matlab

Histogram Shrink in Matlab

Image Histogram is a graphical representation of the gray level distribution in an Image.

Follow these steps to make Program for shrinking the range of Gray Level in Image

  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

 

ImageShrinkingGUI
GUI: Histogram Shrink

 

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 21:13:23

% 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);

ShrinkMax = str2double(get(handles.max,’String’));
ShrinkMin = str2double(get(handles.min,’String’));
%ShrinkMax = input(‘Please give maximum value::: ‘);
%ShrinkMin = input(‘Please give minimun value::: ‘);

[width ,height ,d] = size(Matrix);
processedImage = Matrix;

[value, index] = max(Matrix,[],2);
ImageMaxValue = max(max(value));

[value, index] = min(Matrix,[],2);
ImageMinValue = min(min(value));
for col = 1 : 1 : width
for row = 1 : 1 : height
processedImage(col,row) = round(((double(ShrinkMax – ShrinkMin)/ double(ImageMaxValue – ImageMinValue)) * double(Matrix(col,row) – ImageMinValue)) + ShrinkMin);
end
end

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

function min_Callback(hObject, eventdata, handles)
% hObject handle to min (see GCBO)
% eventdata reserved – to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)

% Hints: get(hObject,’String’) returns contents of min as text
% str2double(get(hObject,’String’)) returns contents of min as a double
% — Executes during object creation, after setting all properties.
function min_CreateFcn(hObject, eventdata, handles)
% hObject handle to min (see GCBO)
% eventdata reserved – to be defined in a future version of MATLAB
% handles empty – handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
% See ISPC and COMPUTER.
if ispc && isequal(get(hObject,’BackgroundColor’), get(0,’defaultUicontrolBackgroundColor’))
set(hObject,’BackgroundColor’,’white’);
end

function max_Callback(hObject, eventdata, handles)
% hObject handle to max (see GCBO)
% eventdata reserved – to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)

% Hints: get(hObject,’String’) returns contents of max as text
% str2double(get(hObject,’String’)) returns contents of max as a double
% — Executes during object creation, after setting all properties.
function max_CreateFcn(hObject, eventdata, handles)
% hObject handle to max (see GCBO)
% eventdata reserved – to be defined in a future version of MATLAB
% handles empty – handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
% See ISPC and COMPUTER.
if ispc && isequal(get(hObject,’BackgroundColor’), get(0,’defaultUicontrolBackgroundColor’))
set(hObject,’BackgroundColor’,’white’);
end

Input Image:

Gray Level Image
Gray Level Image

Processed Image: 

Min = 20 & Max = 100

LennaShrinkedImage.PNG

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