MATLAB 2015a
    • Image Processing and Computer Vision
       –Use graphical tools to visualize and manipulate images and 
         video. Connect to hardware and develop new ideas using 
         libraries of reference-standard algorithms.
    • Products:
       –MATLAB
       –Computer Vision System Toolbox
       –Image Acquisition Toolbox
       –Image Processing Toolbox
       –Parallel Computing Toolbox
       –Signal Processing Toolbox
       –Statistics and Machine Learning Toolbox
                  PCD-ML Pengolahan Citra Menggunakan MATLAB
                                                Images in Matlab
                     • Matlab is optimised for operating on 
                           matrices
                     • Images are matrices!
                     • Many useful built-in functions in the 
                           Matlab Image Processing Toolbox
                     • Very easy to write your own image 
                           processing functions
                                                                                                                                                          •   3
                                              PCD-ML Pengolahan Citra Menggunakan MATLAB
              Loading and displaying images
         >> I=imread('mandrill.bmp','bmp');                    % load image
                                                                    image format as a string
    Matrix  with               image filename as a string
    image data
         >> image(I)   % display image
         >> whos I
         Name       Size                   Bytes         Class
           I            512x512x3             786432    uint8 array
         Grand total is 786432 elements using 786432 bytes
                                                                Matlab      can      only          Display    the 
                   Dimensions  of  I  (red,                     perform       arithmetic           left half of the 
                   green and blue intensity                     operations  on  data               mandrill 
                                                                with class double!                 image
                   information)
                                PCD-ML Pengolahan Citra Menggunakan MATLAB
           Ekstraksi Color Channel
       %----------membaca dan isi variabel----------------¬
       gambar=imread(‘lena.jpg’);
       red=gambar; 
       green=gambar;
       blue=gambar;
       %----------memproses per channel ---------------¬
       red(:,:,2)=0;
       red(:,:,3)=0;
       green=(:,:,1)=0;
       green=(:,:,3)=0;
       blue(:,:,1)=0;
       blue(:,:,2)=0;
       %----------menampilkan gambar----------------¬
       imshow(gambar)
       imshow(red)
       imshow(green)
       imshow(blue)
              PCD-ML Pengolahan Citra Menggunakan MATLAB
            Konversi RGB ke Gray
       %------- Image Processing Toolbox ------
       gambar=imread(‘lena.jpg’);
       gray=rgb2gray(gambar);
       imshow(gray);
       %------- Conventional ------
       gray2 = 0.2989 * rgb(:,:,1) +0.5870 * 
       rgb(:,:,2) + 0.1140 * rgb(:,:,3); 
       imshow(gray2);
              PCD-ML Pengolahan Citra Menggunakan MATLAB