Desktop : OpenCV Adaptive Threshold

<h5>Goal</h5>
Test OpenCV adaptive threshold.

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

public class OpenCV_Adaptive_Threshold {

    static{System.loadLibrary(Core.NATIVE_LIBRARY_NAME);}

    private JFrame frmjavaSwing;
    double thresh = 0;
    int type = 0;

    /**
     *  Launch the application.
     */
    public static void main(String[] argv) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    OpenCV_Adaptive_Threshold window = new OpenCV_Adaptive_Threshold();
                    window.frmjavaSwing.setVisible(true);

                } catch (Exception ex) {
                    ex.printStackTrace();
                }
            }
        });
    }
        /**
                *  Create the application.
                */
        public OpenCV_Adaptive_Threshold(){
            init();
            System.out.println("THRESH_BINARY="+Imgproc.THRESH_BINARY);
            System.out.println("THRESH_BINARY_INV="+Imgproc.THRESH_BINARY_INV);
            System.out.println("ADAPTIVE_THRESH_GAUSSIAN_C="+ Imgproc.ADAPTIVE_THRESH_GAUSSIAN_C);
            System.out.println("ADAPTIVE_THRESH_MEAN_C="+Imgproc.ADAPTIVE_THRESH_MEAN_C);
        }


    private void init() {
        final Mat source = Imgcodecs.imread("D:\\projects\\Java\\OpenCV_Samples\\resource\\imgs\\clean.jpg", CvType.CV_8UC1);

        BufferedImage image=matToBufferedImage(source);

        frmjavaSwing = new JFrame();
        frmjavaSwing.setTitle("opencv adaptiveThreshold�m��");
        frmjavaSwing.setBounds(100, 100, 520, 550);
        frmjavaSwing.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frmjavaSwing.getContentPane().setLayout(null);

        final JLabel showAlphaValue = new JLabel("1");
        showAlphaValue.setBounds(260, 10, 40, 15);
        frmjavaSwing.getContentPane().add(showAlphaValue);

        final JLabel showBetaValue = new JLabel("1");
        showBetaValue.setBounds(256, 35, 29, 15);
        frmjavaSwing.getContentPane().add(showBetaValue);

        final JLabel lblNewLabel = new JLabel("");
        lblNewLabel.setBounds(10, 68, 438, 438);
        lblNewLabel.setIcon(new ImageIcon(image));
        frmjavaSwing.getContentPane().add(lblNewLabel);

        final JSlider slider_Maxval = new JSlider();
        slider_Maxval.setMinimum(1);
        slider_Maxval.setValue(1);
        slider_Maxval.setMaximum(300);
        slider_Maxval.setBounds(67, 33, 185, 25);
        frmjavaSwing.getContentPane().add(slider_Maxval);

        final JSlider slider_AdaptiveMethod = new JSlider();
        slider_AdaptiveMethod.setMaximum(1);
        slider_AdaptiveMethod.setValue(0);
        slider_AdaptiveMethod.setBounds(380, 10, 46, 25);
        frmjavaSwing.getContentPane().add(slider_AdaptiveMethod);


        final JSlider slider_blockSize = new JSlider();
        slider_blockSize.setMinimum(3);
        slider_blockSize.setMaximum(301);
        slider_blockSize.setValue(3);

        slider_blockSize.setBounds(67, 10, 192, 25);
        frmjavaSwing.getContentPane().add(slider_blockSize);

        JLabel lblThresh = new JLabel("blockSize");
        lblThresh.setBounds(10, 20, 58, 15);
        frmjavaSwing.getContentPane().add(lblThresh);

        JLabel lblMaxval = new JLabel("Maxval");
        lblMaxval.setBounds(10, 45, 46, 15);
        frmjavaSwing.getContentPane().add(lblMaxval);

        JLabel lblAdaptiveMethod = new JLabel("adaptiveMethod");
        lblAdaptiveMethod.setBounds(291, 10, 93, 15);
        frmjavaSwing.getContentPane().add(lblAdaptiveMethod);

        final JLabel showAdaptiveMethodValue = new JLabel("0");
        showAdaptiveMethodValue.setBounds(429, 10, 19, 15);
        frmjavaSwing.getContentPane().add(showAdaptiveMethodValue);

        JLabel lblNewLabel_1 = new JLabel("type");
        lblNewLabel_1.setBounds(306, 35, 46, 15);
        frmjavaSwing.getContentPane().add(lblNewLabel_1);

        final JSlider slider_Type = new JSlider();

        slider_Type.setValue(0);
        slider_Type.setMaximum(1);
        slider_Type.setBounds(343, 25, 46, 25);
        frmjavaSwing.getContentPane().add(slider_Type);

        final JLabel showTypeValue = new JLabel("0");
        showTypeValue.setBounds(402, 35, 46, 15);
        frmjavaSwing.getContentPane().add(showTypeValue);

        slider_blockSize.addChangeListener(new ChangeListener() {
            public void stateChanged(ChangeEvent arg0) {
                //System.out.println(slider_alpha.getValue());
                if(slider_blockSize.getValue()%2==0){
                    slider_blockSize.setValue(slider_blockSize.getValue()+1);
                }

                showAlphaValue.setText(slider_blockSize.getValue()+"");
                BufferedImage newImage=matToBufferedImage(threshold(source,slider_blockSize.getValue(),slider_Maxval.getValue(),slider_AdaptiveMethod.getValue(),slider_Type.getValue()));
                lblNewLabel.setIcon(new ImageIcon(newImage));
            }
        });

        slider_Type.addChangeListener(new ChangeListener() {
            public void stateChanged(ChangeEvent arg0) {
                showTypeValue.setText(slider_Type.getValue()+"");
                BufferedImage newImage=matToBufferedImage(threshold(source,slider_blockSize.getValue(),slider_Maxval.getValue(),slider_AdaptiveMethod.getValue(),slider_Type.getValue()));
                lblNewLabel.setIcon(new ImageIcon(newImage));

            }
        });
        slider_AdaptiveMethod.addChangeListener(new ChangeListener() {
            public void stateChanged(ChangeEvent arg0) {
                showAdaptiveMethodValue.setText(slider_AdaptiveMethod.getValue()+"");
                BufferedImage newImage=matToBufferedImage(threshold(source,slider_blockSize.getValue(),slider_Maxval.getValue(),slider_AdaptiveMethod.getValue(),slider_Type.getValue()));
                lblNewLabel.setIcon(new ImageIcon(newImage));

            }
        });

        slider_Maxval.addChangeListener(new ChangeListener() {
            public void stateChanged(ChangeEvent arg0) {
                showBetaValue.setText(slider_Maxval.getValue()+"");
                BufferedImage newImage=matToBufferedImage(threshold(source,slider_blockSize.getValue(),slider_Maxval.getValue(),slider_AdaptiveMethod.getValue(),slider_Type.getValue()));
                lblNewLabel.setIcon(new ImageIcon(newImage));
            }
        });
    }

    public Mat threshold(Mat source,int blockSize,double maxval,int AdaptiveMethod,int type){

        Mat destination=new Mat(source.rows(),source.cols(),source.type());
        Imgproc.adaptiveThreshold(source, destination, maxval,AdaptiveMethod, type, blockSize, 0);
        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_adaptive_threshold.JPG](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/276243/aaae4be6-d499-f12d-7176-234db8346d4f.jpeg)