Desktop : OpenCV Text

<h5>Goal</h5>
Test OpenCV text.

```OpenCV_Text.java
import org.opencv.core.Core;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.core.Scalar;
import org.opencv.imgproc.Imgproc;

import org.opencv.core.Point;
import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;

public class OpenCV_Text {
    static{ System.loadLibrary(Core.NATIVE_LIBRARY_NAME); }
    private JFrame frmjavaSwing;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {

        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    OpenCV_Text window = new OpenCV_Text();
                    window.frmjavaSwing.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     */
    public OpenCV_Text() {
        init();
    }

    /**
     * Initialize the contents of the frame.
     */
    private void init() {
        Mat source =  paint();
        BufferedImage image=matToBufferedImage(source);

        frmjavaSwing = new JFrame();
        frmjavaSwing.setTitle("opencv ¿é¤J¤å¦r½m²ß");
        frmjavaSwing.setBounds(100, 100, 300, 300);
        frmjavaSwing.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frmjavaSwing.getContentPane().setLayout(null);

        final JLabel lblNewLabel = new JLabel("");
        lblNewLabel.setBounds(5, 5, image.getHeight()+10, image.getWidth()+10);
        lblNewLabel.setIcon(new ImageIcon(image));
        frmjavaSwing.getContentPane().add(lblNewLabel);
    }

    public Mat paint(){

        Mat source = new Mat(250,250, CvType.CV_8UC3, new Scalar(255,255,255));

        Imgproc.putText(source,new String("I love Opencv"), new Point(125,25), 0, 0.5, new Scalar(255, 0, 0));
        Imgproc.putText(source,new String("I love Opencv"), new Point(125,50), 1, 0.5, new Scalar(255, 0, 0));
        Imgproc.putText(source,new String("I love Opencv"), new Point(125,75), 2, 0.5, new Scalar(255, 0, 0));
        Imgproc.putText(source,new String("I love Opencv"), new Point(125,100), 3, 0.5, new Scalar(255, 0, 0));
        Imgproc.putText(source,new String("I love Opencv"), new Point(125,125), 4, 0.5, new Scalar(255, 0, 0));
        Imgproc.putText(source,new String("I love Opencv"), new Point(125,150), 5, 0.5, new Scalar(255, 0, 0));
        Imgproc.putText(source,new String("I love Opencv"), new Point(125,175), 6, 0.5, new Scalar(255, 0, 0));
        Imgproc.putText(source,new String("I love Opencv"), new Point(125,200), 7, 0.5, new Scalar(255, 0, 0));
        return source;
    }

    public BufferedImage matToBufferedImage(Mat matrix) {
        int cols = matrix.cols();
        int rows = matrix.rows();
        int elemSize = (int)matrix.elemSize();
        byte[] data = new byte[cols * rows * elemSize];
        int type;
        matrix.get(0, 0, data);
        switch (matrix.channels()) {
            case 1:
                type = BufferedImage.TYPE_BYTE_GRAY;
                break;
            case 3:
                type = BufferedImage.TYPE_3BYTE_BGR;
                // bgr to rgb
                byte b;
                for(int i=0; i<data.length; i=i+3) {
                    b = data[i];
                    data[i] = data[i+2];
                    data[i+2] = b;
                }
                break;
            default:
                return null;
        }
        BufferedImage image2 = new BufferedImage(cols, rows, type);
        image2.getRaster().setDataElements(0, 0, cols, rows, data);
        return image2;
    }
}
```
<h5>Result</h5>
![opencv_text.JPG](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/276243/7c16bcda-2cff-72c7-0832-4b605989a29b.jpeg)