Operasi Morfologi Citra


Operasi morfologi citra merupakan suatu proses yang bertujuan untuk mengubah bentuk objek pada citra asli. Proses tersebut dapat dilakukan pada citra grayscale maupun citra biner.

Jenis-jenis operasi morfologi di antaranya adalah dilasi, erosi, closing, dan opening. Secara berurutan, persamaan yang digunakan untuk masing-masing operasi yaitu:

Screen Shot 2013-09-16 at 4.44.12 PM
di mana A adalah citra asli dan B adalah structuring element. Structuring element merupakan matriks operator yang dapat berbentuk garis, persegi, disk, diamond, dll.

Contoh pemrograman GUI Matlab untuk operasi morfologi adalah sebagai berikut:
1. Membaca citra grayscale (asli) dan mengkonversinya menjadi citra biner
1

2. Operasi erosi dengan structure element ‘line’ dan R = 307

3. Operasi erosi dengan structure element ‘disk’ dan R = 10 2

4. Operasi dilasi dengan structure element ‘diamond’ dan R = 103

5. Operasi dilasi dengan structure element ‘square’ dan R = 30 4

6. Operasi opening dengan structure element ‘diamond’ dan R = 205

7. Operasi closing dengan structure element ‘line’ dan R = 30 6
Source code dan citra untuk proses operasi morfologi dapat diunduh pada laman berikut: link
Sedangkan tampilan source codenya adalah:

function varargout = Morphological_Operation(varargin)
% MORPHOLOGICAL_OPERATION MATLAB code for Morphological_Operation.fig
% MORPHOLOGICAL_OPERATION, by itself, creates a new MORPHOLOGICAL_OPERATION or raises the existing
% singleton*.
%
% H = MORPHOLOGICAL_OPERATION returns the handle to a new MORPHOLOGICAL_OPERATION or the handle to
% the existing singleton*.
%
% MORPHOLOGICAL_OPERATION('CALLBACK',hObject,eventData,handles,...) calls the local
% function named CALLBACK in MORPHOLOGICAL_OPERATION.M with the given input arguments.
%
% MORPHOLOGICAL_OPERATION('Property','Value',...) creates a new MORPHOLOGICAL_OPERATION or raises the
% existing singleton*. Starting from the left, property value pairs are
% applied to the GUI before Morphological_Operation_OpeningFcn gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed to Morphological_Operation_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 Morphological_Operation

% Last Modified by GUIDE v2.5 11-Aug-2015 12:56:06

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @Morphological_Operation_OpeningFcn, ...
'gui_OutputFcn', @Morphological_Operation_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 Morphological_Operation is made visible.
function Morphological_Operation_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 Morphological_Operation (see VARARGIN)

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

% Update handles structure
guidata(hObject, handles);
movegui(hObject,'center');
clc;clear;

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


% --- Outputs from this function are returned to the command line.
function varargout = Morphological_Operation_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 radiobutton1.
function radiobutton1_Callback(hObject, eventdata, handles)
% hObject handle to radiobutton1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)

% Hint: get(hObject,'Value') returns toggle state of radiobutton1
set(handles.radiobutton1,'Value',1)
set(handles.radiobutton2,'Value',0)
set(handles.radiobutton3,'Value',0)
set(handles.radiobutton4,'Value',0)


% --- Executes on button press in radiobutton2.
function radiobutton2_Callback(hObject, eventdata, handles)
% hObject handle to radiobutton2 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)

% Hint: get(hObject,'Value') returns toggle state of radiobutton2
set(handles.radiobutton1,'Value',0)
set(handles.radiobutton2,'Value',1)
set(handles.radiobutton3,'Value',0)
set(handles.radiobutton4,'Value',0)

% --- Executes on button press in radiobutton3.
function radiobutton3_Callback(hObject, eventdata, handles)
% hObject handle to radiobutton3 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)

% Hint: get(hObject,'Value') returns toggle state of radiobutton3
set(handles.radiobutton1,'Value',0)
set(handles.radiobutton2,'Value',0)
set(handles.radiobutton3,'Value',1)
set(handles.radiobutton4,'Value',0)

% --- Executes on button press in radiobutton4.
function radiobutton4_Callback(hObject, eventdata, handles)
% hObject handle to radiobutton4 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)

% Hint: get(hObject,'Value') returns toggle state of radiobutton4
set(handles.radiobutton1,'Value',0)
set(handles.radiobutton2,'Value',0)
set(handles.radiobutton3,'Value',0)
set(handles.radiobutton4,'Value',1)

% --- Executes on button press in radiobutton5.
function radiobutton5_Callback(hObject, eventdata, handles)
% hObject handle to radiobutton5 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)

% Hint: get(hObject,'Value') returns toggle state of radiobutton5
set(handles.radiobutton5,'Value',1)
set(handles.radiobutton6,'Value',0)
set(handles.radiobutton7,'Value',0)
set(handles.radiobutton8,'Value',0)

% --- Executes on button press in radiobutton6.
function radiobutton6_Callback(hObject, eventdata, handles)
% hObject handle to radiobutton6 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)

% Hint: get(hObject,'Value') returns toggle state of radiobutton6
set(handles.radiobutton5,'Value',0)
set(handles.radiobutton6,'Value',1)
set(handles.radiobutton7,'Value',0)
set(handles.radiobutton8,'Value',0)

% --- Executes on button press in radiobutton7.
function radiobutton7_Callback(hObject, eventdata, handles)
% hObject handle to radiobutton7 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)

% Hint: get(hObject,'Value') returns toggle state of radiobutton7
set(handles.radiobutton5,'Value',0)
set(handles.radiobutton6,'Value',0)
set(handles.radiobutton7,'Value',1)
set(handles.radiobutton8,'Value',0)

% --- Executes on button press in radiobutton8.
function radiobutton8_Callback(hObject, eventdata, handles)
% hObject handle to radiobutton8 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)

% Hint: get(hObject,'Value') returns toggle state of radiobutton8
set(handles.radiobutton5,'Value',0)
set(handles.radiobutton6,'Value',0)
set(handles.radiobutton7,'Value',0)
set(handles.radiobutton8,'Value',1)

% --- 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,pathname] = uigetfile({'*.*'});

if ~isequal(filename,0)
Info = imfinfo(fullfile(pathname,filename));
if Info.BitDepth == 1
msgbox('Citra masukan harus citra RGB atau Grayscale');
return
elseif Info.BitDepth == 8
Img_Gray = imread(fullfile(pathname,filename));
axes(handles.axes1)
cla('reset')
imshow(Img_Gray)
title('Grayscale Image')
Img_bw = im2bw(Img_Gray,graythresh(Img_Gray));
axes(handles.axes2)
cla('reset')
imshow(Img_bw)
title('Binary Image')
else
Img_Gray = rgb2gray(imread(fullfile(pathname,filename)));
axes(handles.axes1)
cla('reset')
imshow(Img_Gray)
title('Grayscale Image')
Img_bw = im2bw(Img_Gray,graythresh(Img_Gray));
axes(handles.axes2)
cla('reset')
imshow(Img_bw)
title('Binary Image')
end
else
return
end

handles.Img_Gray = Img_Gray;
handles.Img_Gray2 = Img_Gray;
handles.Img_bw = Img_bw;
handles.Img_bw2 = Img_bw;
guidata(hObject,handles);

set(handles.pushbutton2,'Enable','on')
set(handles.pushbutton3,'Enable','on')

% --- Executes on button press in pushbutton2.
function pushbutton2_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton2 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
Img_Gray = handles.Img_Gray;
Img_bw = handles.Img_bw;

% Operations
val1 = get(handles.radiobutton1,'Value');
val2 = get(handles.radiobutton2,'Value');
val3 = get(handles.radiobutton3,'Value');
val4 = get(handles.radiobutton4,'Value');

% Structure Element
val5 = get(handles.radiobutton5,'Value');
val6 = get(handles.radiobutton6,'Value');
val7 = get(handles.radiobutton7,'Value');
val8 = get(handles.radiobutton8,'Value');

% R
R = str2double(get(handles.edit1,'String'));

%
if val5 == 1
se = strel('disk',R);
elseif val6 == 1
se = strel('diamond',R);
elseif val7 == 1
se = strel('square',R);
elseif val8 == 1
se = strel('line',R,45);
end


if val1 == 1
Img_Gray = imerode(Img_Gray,se);
Img_bw = imerode(Img_bw,se);
elseif val2 == 1
Img_Gray = imdilate(Img_Gray,se);
Img_bw = imdilate(Img_bw,se);
elseif val3 == 1
Img_Gray = imopen(Img_Gray,se);
Img_bw = imopen(Img_bw,se);
elseif val4 == 1
Img_Gray = imclose(Img_Gray,se);
Img_bw = imclose(Img_bw,se);
end

axes(handles.axes1)
cla('reset')
imshow(Img_Gray)
title('Grayscale Image')
axes(handles.axes2)
cla('reset')
imshow(Img_bw)
title('Binary Image')

handles.Img_Gray = Img_Gray;
handles.Img_bw = Img_bw;
guidata(hObject,handles)

% --- Executes on slider movement.
function slider1_Callback(hObject, eventdata, handles)
% hObject handle to slider1 (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,'Value') returns position of slider
% get(hObject,'Min') and get(hObject,'Max') to determine range of slider
val = get(hObject,'Value');
set(handles.edit1,'String',val+1)

% --- Executes during object creation, after setting all properties.
function slider1_CreateFcn(hObject, eventdata, handles)
% hObject handle to slider1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles empty - handles not created until after all CreateFcns called

% Hint: slider controls usually have a light gray background.
if isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor',[.9 .9 .9]);
end


function edit1_Callback(hObject, eventdata, handles)
% hObject handle to edit1 (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 edit1 as text
% str2double(get(hObject,'String')) returns contents of edit1 as a double


% --- Executes during object creation, after setting all properties.
function edit1_CreateFcn(hObject, eventdata, handles)
% hObject handle to edit1 (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


% --- Executes on button press in pushbutton3.
function pushbutton3_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton3 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
Img_Gray = handles.Img_Gray2;
Img_bw = handles.Img_bw2;

axes(handles.axes1)
cla('reset')
imshow(Img_Gray)

axes(handles.axes2)
cla('reset')
imshow(Img_bw)

handles.Img_Gray = Img_Gray;
handles.Img_bw = Img_bw;
guidata(hObject,handles)

 

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