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   1: public BufferedImage matToBufferedImage(Mat matrix){

   2:         int cols = matrix.cols();

   3:         int rows = matrix.rows();

   4:         int elemSize = (int)matrix.elemSize();

   5:         byte[] data = new byte[cols*rows*elemSize];    

   6:         matrix.get(0, 0, data);

   7:         BufferedImage bufImg = null;

   8:         switch(matrix.channels())

   9:         {

  10:         case 1:

  11:             bufImg = new BufferedImage(cols, rows, BufferedImage.TYPE_BYTE_GRAY);

  12:             break;

  13:         case 3:

  14:             bufImg = new BufferedImage(cols,rows, BufferedImage.TYPE_3BYTE_BGR);

  15:             break;

  16:         }        

  17:         bufImg.getRaster().setDataElements(0, 0, cols, rows, data);

  18:         return bufImg;        

  19:     }

   1: private void initialize() {

   2:         System.loadLibrary(Core.NATIVE_LIBRARY_NAME);

   3:         Mat imgSrc = Imgcodecs.imread("C:\\OpenCV\\images\\lena.jpg");

   4:         //Mat imgSrc = Imgcodecs.imread("C:\\OpenCV\\images\\left01.jpg");

   5:         Mat imgDst = new Mat();

   6:         Imgproc.cvtColor(imgSrc, imgDst, Imgproc.COLOR_BGR2RGB);

   7:         BufferedImage bufImg = matToBufferedImage(imgDst);

   8:         

   9:         frame = new JFrame();

  10:         frame.setBounds(100, 100, 700, 737);

  11:         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

  12:         frame.getContentPane().setLayout(null);

  13:         

  14:         JLabel lblImage = new JLabel("New label");

  15:         lblImage.setBounds(0, 0, imgSrc.width(), imgSrc.height());

  16:         lblImage.setIcon(new ImageIcon(bufImg));

  17:         frame.getContentPane().add(lblImage);

  18:         frame.setBounds(100,100,imgSrc.width(), imgSrc.height());

  19:     

  20:     }

   1: // bgr to rgb

   2: byte b;

   3: for(int i=0; i< data.length; i=i+3)

   4: {

   5:    b = data[i];

   6:    data[i] = data[i+2];

   7:    data[i+2]= b;

   8: }