Desktop : OpenCV pyrMeanShift Filter

<h5>Goal</h5>
Test OpenCV pyrMeanShift filter.

```OpenCV_pyrMeanShiftFiltering.java
import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.TermCriteria;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;

import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import java.awt.*;
import java.awt.image.BufferedImage;

public class OpenCV_pyrMeanShiftFiltering {

    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_pyrMeanShiftFiltering window = new OpenCV_pyrMeanShiftFiltering();
                    window.frmjavaSwing.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     */
    public OpenCV_pyrMeanShiftFiltering() {
        initialize();

    }

    /**
     * Initialize the contents of the frame.
     */
    private void initialize() {

        frmjavaSwing = new JFrame();
        frmjavaSwing.setTitle("opencv ªoµe³B²z½m²ß");
        frmjavaSwing.setBounds(100, 100, 565, 550);
        frmjavaSwing.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frmjavaSwing.getContentPane().setLayout(null);

        final JLabel showSpValue = new JLabel("17");
        showSpValue.setBounds(142, 20, 46, 15);
        frmjavaSwing.getContentPane().add(showSpValue);

        final JSlider slider_method = new JSlider();
        slider_method.setMinimum(1);
        slider_method.setMaximum(30);
        slider_method.setValue(17);

        slider_method.setBounds(26, 10, 106, 25);
        frmjavaSwing.getContentPane().add(slider_method);

        JLabel lblAlpha = new JLabel("SP");
        lblAlpha.setBounds(10, 20, 46, 15);
        frmjavaSwing.getContentPane().add(lblAlpha);

        final JLabel lblNewLabel_2 = new JLabel("");
        lblNewLabel_2.setBounds(10, 38, 517, 468);
        frmjavaSwing.getContentPane().add(lblNewLabel_2);

        JLabel lblSr = new JLabel("SR");
        lblSr.setBounds(176, 20, 46, 15);
        frmjavaSwing.getContentPane().add(lblSr);

        final JSlider slider = new JSlider();

        slider.setValue(30);
        slider.setMinimum(1);
        slider.setMaximum(50);
        slider.setBounds(199, 10, 112, 25);
        frmjavaSwing.getContentPane().add(slider);

        final JLabel showSrValue = new JLabel("30");
        showSrValue.setBounds(310, 20, 46, 15);
        frmjavaSwing.getContentPane().add(showSrValue);

        JLabel lblMaxlevel = new JLabel("maxLevel");
        lblMaxlevel.setBounds(342, 20, 65, 15);
        frmjavaSwing.getContentPane().add(lblMaxlevel);

        final JSlider slider_maxLevel = new JSlider();

        slider_maxLevel.setValue(1);
        slider_maxLevel.setMinimum(1);
        slider_maxLevel.setMaximum(10);
        slider_maxLevel.setBounds(404, 10, 106, 25);
        frmjavaSwing.getContentPane().add(slider_maxLevel);

        final JLabel labelMaxLevel = new JLabel("1");
        labelMaxLevel.setBounds(511, 20, 46, 15);
        frmjavaSwing.getContentPane().add(labelMaxLevel);

        slider_method.addChangeListener(new ChangeListener() {
            public void stateChanged(ChangeEvent arg0) {
                //System.out.println(slider_alpha.getValue());
                showSpValue.setText(slider_method.getValue()+"");

                BufferedImage newImage=matToBufferedImage(pyrMeanShiftFiltering(slider_method.getValue(),slider.getValue(),slider_maxLevel.getValue()));
                lblNewLabel_2.setIcon(new ImageIcon(newImage));
            }
        });

        slider.addChangeListener(new ChangeListener() {
            public void stateChanged(ChangeEvent arg0) {
                showSrValue.setText(slider.getValue()+"");
                BufferedImage newImage=matToBufferedImage(pyrMeanShiftFiltering(slider_method.getValue(),slider.getValue(),slider_maxLevel.getValue()));
                lblNewLabel_2.setIcon(new ImageIcon(newImage));
            }
        });
        slider_maxLevel.addChangeListener(new ChangeListener() {
            public void stateChanged(ChangeEvent e) {
                labelMaxLevel.setText(slider_maxLevel.getValue()+"");
                BufferedImage newImage=matToBufferedImage(pyrMeanShiftFiltering(slider_method.getValue(),slider.getValue(),slider_maxLevel.getValue()));
                lblNewLabel_2.setIcon(new ImageIcon(newImage));
            }
        });
    }
    public Mat pyrMeanShiftFiltering(int sp,int sr,int maxLevel){
        Mat source2 = Imgcodecs.imread("D:\\projects\\Java\\OpenCV_Samples\\resource\\imgs\\clean.jpg");
        Mat output=new Mat();
        Imgproc.pyrMeanShiftFiltering(source2, output, sp, sr,maxLevel, new TermCriteria(TermCriteria.MAX_ITER| TermCriteria.EPS,50,0.001));

        return output;
    }

    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_pyr_mean_shift_filter.JPG](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/276243/bc291931-a58b-4dfd-b4a6-4057ac7de137.jpeg)