Matlab (Matrix Laboratory) merupakan salah satu perangkat lunak yang mendukung bidang pengolahan citra digital. Dalam bidang tersebut pada umumnya diawali dengan proses akuisisi citra digital.

Proses akuisisi citra digital dilakukan dengan cara menangkap (capture) atau memindai (scan) citra analog kemudian mengkonversinya menjadi citra digital agar dapat disimpan dan juga diolah melalui komputer.

Salah satu alat akuisisi citra digital yang sering digunakan adalah webcam.

Dalam software Matlab, proses akuisisi citra digital menggunakan webcam dapat dilakukan dengan terlebih dahulu menginstal driver Image Acquisition Support Packages for Hardware Adaptors.

Ada cukup banyak driver yang perlu diinstal yaitu sebagai berikut:

Langkah-langkah untuk menginstal driver-driver tersebut adalah:
1. Klik tool ‘Add-Ons’ pada home tool, kemudian pilih ‘Get Hardware Support Packages’

2. Pilih install from internet, lalu pilih next

3. Pilih support packages yang ingin diinstal sesuai dengan tabel tersebut di atas, misalnya ‘DCAM Hardware’, kemudian pilih next

4. Log in dengan akun mathworks (bagi yang sudah punya akun). Jika belum mempunyai akun, sign up lah terlebih dahulu pada laman berikut https://www.mathworks.com/mwaccount/register?uri=/accesslogin/myAccount.do

5. Setelah log in, beri centang pada  ‘I accept’, kemudian pilih next

6. Pilih next

7. Lalu pilih install

8. Install juga driver Image Acquisition Support Packages for Hardware Adaptors yang lain sesuai dengan tabel di atas.

9. Setelah semua driver-driver tersebut berhasil diinstal, maka Software Matlab telah support untuk melakukan akuisisi citra. Persiapkanlah webcam yang akan digunakan, bisa menggunakan usb webcam atau bisa juga menggunakan webcam laptop.

10. Berikut ini merupakan contoh pemrograman GUI Matlab untuk mengakuisisi citra digital menggunakan webcam:
a. Tampilan GUI awal

b. Konfigurasi kamera, untuk webcam pilih winvideo

c.Pilih device id 1 untuk webcam laptop, pilih device id 2 untuk usb webcam

d. Pilih resolusi kamera yang diinginkan

e. Klik capture untuk menangkap sekaligus menyimpan citra hasil akuisisi

f. Citra hasil akuisisi secara otomatis akan tersimpan dalam komputer

File source code lengkap untuk akuisisi citra digital dapat diperoleh melalui halaman berikut ini: Source Code

Sedangkan tampilan source codenya adalah:

% Adi Pamungkas, S.Si, M.Si
% Website: https://pemrogramanmatlab.com/
% Email  : pemrogramanmatlab@gmail.com

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

% Last Modified by GUIDE v2.5 04-Apr-2016 13:44:04

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

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

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

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


% --- Outputs from this function are returned to the command line.
function varargout = Camera_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)
IAHI = imaqhwinfo;
IA = (IAHI.InstalledAdaptors);
D = menu('Select Video Input Device:',IA);

if isempty(IA)||D==0
    msgbox({'You don''t have any VideoInput Installed Adaptors!',...
        'Please! try again and select Adaptor properly.'})
    return
end

IA = char(IA);
IA = IA(D,:);
IA(IA==' ')=[];
x = imaqhwinfo(IA);

try
    DeviceID = menu('Select Device ID',x.DeviceIDs);
    F = x.DeviceInfo(DeviceID).SupportedFormats;
    nF = menu('Select FORMAT',F);
    Format = F{nF};
catch
    warndlg({'Try Another Device or ID ';...
        'You Don''t Have Installed This Device (VideoInputDevice)'})
    return
end

VidObj = videoinput(IA, DeviceID, Format);
handles.VidObj = VidObj;
vidRes = get(handles.VidObj, 'VideoResolution');
nBands = get(handles.VidObj, 'NumberOfBands');
axes(handles.axes1)
hImage = image( zeros(vidRes(2), vidRes(1), nBands) );
preview(handles.VidObj, hImage)
set(VidObj,'returnedcolorspace','rgb');
guidata(hObject, handles);

% --- 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)
try
    VidObj = handles.VidObj;
    i = getsnapshot(VidObj);
    
    n = str2double(get(handles.edit1,'String'))+1;
    set(handles.edit1,'String',num2str(n));
    
    axes(handles.axes2)
    imshow(i);
    
    imwrite(i,strcat(['Image ',num2str(n),'.jpg']))
catch
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)
try
    delete(handles.VidObj)
catch
end

axes(handles.axes1)
cla reset
set(gca,'XTick',[])
set(gca,'YTick',[])

axes(handles.axes2)
cla reset
set(gca,'XTick',[])
set(gca,'YTick',[])

set(handles.edit1,'String',0)

% --- Executes on button press in pushbutton4.
function pushbutton4_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton4 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
close;


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

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