Tutorial

Tutorial membuat thresholding

(program matlab)

Thresholding merupakan salah satu metode segmentasi citra di mana prosesnya didasarkan pada perbedaan derajat keabuan citra.

Marilah kita simak penjelasan tentang cara pembuatan thresholding di bawah ini :

1.      Langkah pertama kita membuat disegn thresholding

2.      Lalu kita mengisi skrip yang pertama open image

% --- Executes on button press in pushbutton1.

function pushbutton1_Callback(hObject, eventdata, handles)

[name_file1,name_path1] = uigetfile(...

    {'*.bmp;*.jpg;*.tif','files of type (*.bmp,*.jpg,*.tif)';

    '*.bmp','file Bitmap (*.Bmp)';...

    '*.jpg','file jpeg (*.jpg)';

    '*.tif','file Tif (*.tif)';

    '*.*','All Files (*.*)'},...

    'Open image');

   

    if ~isequal(name_file1,0)

      handles.data1 = imread(fullfile(name_path1,name_file1));

      guidata(hObject,handles);

      axes(handles.axes1);

      imshow(handles.data1);

    else

        return;

    end

3.      Lalu kita mengisi skrip yang ke dua grayscale

% --- Executes on button press in pushbutton2.

function pushbutton2_Callback(hObject, eventdata, handles)

image1 = handles.data1;

gray = rgb2gray(image1);

axes(handles.axes2);

imshow(gray);

handles.data2 = gray;

guidata(hObject,handles);

4. Lalu kita mengisi skrip yang ke tiga slider1_Callback

% --- Executes on slider movement.

function slider1_Callback(hObject, eventdata, handles)

gray = handles.data2;

value = get(handles.slider1,'value');

thresh = imcomplement(im2bw(gray,value/255));

axes(handles.axes2);

imshow(thresh);

handles.data3 = thresh;

guidata(hObject,handles);

set(handles.edit1,'string',value)

5.      Lalu kita mengisi skrip yang ke empat save

% --- Executes on button press in pushbutton3.

function pushbutton3_Callback(hObject, eventdata, handles)

thresh = handles.data3;

[name_file_save,path_save] = uiputfile( ...

    {'*.bmp','file Bitmap (*.bmp)';...

    '*.jpg','file jpeg (*.jpg)';

    '*.tif','file Tif (*.tif)';

    '*.*','All Files (*.*)'},...

'save image');

if~isequal(name_file_save,O)

    imwrite(thresh,fullfile(path_save,name_file_save));

else

    return

end