Desktop : OpenCV Customized Filter

<h5>Goal</h5>
OpenCV Customized Filter.

```
import org.opencv.core.Core;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;

public class OpenCV_Customized {

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

    /**
        * Launch the application.
        */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    OpenCV_Customized window = new OpenCV_Customized();
                    window.frmjavaSwing.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

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

    /**
        * Init tha contents of the frame.
        */
        private void init(){
            final Mat src = Imgcodecs.imread(
                    "D:\\projects\\Java\\OpenCV_Samples\\resource\\imgs\\lena.jpg");

            BufferedImage image=matToBufferedImage(src);

            frmjavaSwing = new JFrame();
            frmjavaSwing.setTitle("opencv ¦Û¤vªºfilter½m²ß");
            frmjavaSwing.setBounds(100, 100, 560, 620);
            frmjavaSwing.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frmjavaSwing.getContentPane().setLayout(null);

            final JLabel lblNewLabel = new JLabel("");
            lblNewLabel.setBounds(5, 60, image.getHeight()+10, image.getWidth()+10);
            lblNewLabel.setIcon(new ImageIcon(image));
            frmjavaSwing.getContentPane().add(lblNewLabel);

            JButton btnR0 = new JButton("C0");
            btnR0.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent arg0) {
                    BufferedImage newImage=matToBufferedImage(Convolution(src,0));
                    lblNewLabel.setIcon(new ImageIcon(newImage));
                }
            });
            btnR0.setBounds(5, 10, 63, 23);
            frmjavaSwing.getContentPane().add(btnR0);

            JButton btnR1 = new JButton("C1");
            btnR1.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent arg0) {
                    BufferedImage newImage=matToBufferedImage(Convolution(src,1));
                    lblNewLabel.setIcon(new ImageIcon(newImage));
                }
            });
            btnR1.setBounds(72, 10, 63, 23);
            frmjavaSwing.getContentPane().add(btnR1);

            JButton btnR2 = new JButton("C2");
            btnR2.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent arg0) {
                    BufferedImage newImage=matToBufferedImage(Convolution(src,2));
                    lblNewLabel.setIcon(new ImageIcon(newImage));
                }
            });
            btnR2.setBounds(136, 10, 63, 23);
            frmjavaSwing.getContentPane().add(btnR2);

            JButton btnR3 = new JButton("C3");
            btnR3.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent arg0) {
                    BufferedImage newImage=matToBufferedImage(Convolution(src,3));
                    lblNewLabel.setIcon(new ImageIcon(newImage));
                }
            });
            btnR3.setBounds(202, 10, 63, 23);
            frmjavaSwing.getContentPane().add(btnR3);

            JButton btnR4 = new JButton("C4");
            btnR4.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent arg0) {
                    BufferedImage newImage=matToBufferedImage(Convolution(src,4));
                    lblNewLabel.setIcon(new ImageIcon(newImage));
                }
            });
            btnR4.setBounds(268, 10, 63, 23);
            frmjavaSwing.getContentPane().add(btnR4);

            JButton btnR5 = new JButton("C5");
            btnR5.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent arg0) {
                    BufferedImage newImage=matToBufferedImage(Convolution(src,5));
                    lblNewLabel.setIcon(new ImageIcon(newImage));
                }
            });
            btnR5.setBounds(336, 10, 63, 23);
            frmjavaSwing.getContentPane().add(btnR5);
        }

    public Mat Convolution(Mat source,int type){
        Mat kernel =new Mat(3,3, CvType.CV_32F);
        if (type==0){
            kernel.put(0, 0, new float[]{0,-1,5});
            kernel.put(1, 0, new float[]{-1,4,-1});
            kernel.put(2, 0, new float[]{0,-1,3});

        }else if (type==1){
            kernel.put(0, 0, new float[]{0,-1,5});
            kernel.put(1, 0, new float[]{-1,4,-1});
            kernel.put(2, 0, new float[]{0,-1,6});


        }else if (type==2){
            kernel.put(0, 0, new float[]{0,-1,5});
            kernel.put(1, 0, new float[]{-1,4,-1});
            kernel.put(2, 0, new float[]{0,-1,9});


        }else if (type==3){
            kernel.put(0, 0, new float[]{-1,-2,1});
            kernel.put(1, 0, new float[]{0,0,0});
            kernel.put(2, 0, new float[]{1,2,1});



        }else if (type==4){
            kernel.put(0, 0, new float[]{-3,-0,-3});
            kernel.put(1, 0, new float[]{-10,0,10});
            kernel.put(2, 0, new float[]{-3,10,3});



        }else if (type==5){
            kernel.put(0, 0, new float[]{-3,-0,3});
            kernel.put(1, 0, new float[]{-10,0,10});
            kernel.put(2, 0, new float[]{-3,10,3});

        }
        Mat destination=new Mat(source.rows(),source.cols(),source.type());
        Imgproc.filter2D(source, destination, -1, kernel);
        return destination;

    }

    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_customized.JPG](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/276243/296c07f5-f41e-7a94-3d77-ca2379edaf17.jpeg)