OpenCV_Laplacian_Filter_GrayScale.java
import org.opencv.core.Core;
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_Laplacian_Filter_GrayScale {
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_Laplacian_Filter_GrayScale window = new OpenCV_Laplacian_Filter_GrayScale();
window.frmjavaSwing.setVisible(true);
}catch (Exception e){
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public OpenCV_Laplacian_Filter_GrayScale() {
init();
}
private void init() {
final Mat src = Imgcodecs.imread(
"D:\\projects\\Java\\OpenCV_Samples\\resource\\imgs\\lena.jpg ");
final Mat temp = new Mat(src.rows(), src.cols(), src.type());
Imgproc.cvtColor(src, temp, Imgproc.COLOR_RGB2GRAY);
BufferedImage image = matToBufferedImage(temp);
frmjavaSwing = new JFrame();
frmjavaSwing.setTitle("opencv Laplacian grayscale image practice");
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);
JLabel lblKsize = new JLabel("Ksize:");
lblKsize.setBounds(10, 10, 46, 15);
frmjavaSwing.getContentPane().add(lblKsize);
final JSlider slider_Ksize = new JSlider();
slider_Ksize.setMinimum(1);
slider_Ksize.setMaximum(31);
slider_Ksize.setValue(1);
slider_Ksize.setBounds(50, 0, 200, 25);
frmjavaSwing.getContentPane().add(slider_Ksize);
final JLabel lblKsize_Val = new JLabel("1");
lblKsize_Val.setBounds(253, 10, 46, 15);
frmjavaSwing.getContentPane().add(lblKsize_Val);
JLabel lblScale = new JLabel(" Scale:");
lblScale.setBounds(5, 35, 42, 15);
frmjavaSwing.getContentPane().add(lblScale);
final JSlider slider_Scale = new JSlider();
slider_Scale.setMinimum(1);
slider_Scale.setValue(1);
slider_Scale.setBounds(50, 35, 200, 25);
frmjavaSwing.getContentPane().add(slider_Scale);
final JLabel lblScale_Val = new JLabel("1");
lblScale_Val.setBounds(253, 35, 46, 15);
frmjavaSwing.getContentPane().add(lblScale_Val);
JLabel lblNewLabel_1 = new JLabel("delta");
lblNewLabel_1.setBounds(301, 10, 46, 15);
frmjavaSwing.getContentPane().add(lblNewLabel_1);
final JSlider slider_Delta = new JSlider();
slider_Delta.setValue(0);
slider_Delta.setBounds(283, 35, 180, 25);
frmjavaSwing.getContentPane().add(slider_Delta);
final JLabel lblDelta_Val = new JLabel("0");
lblDelta_Val.setBounds(473, 35, 46, 15);
frmjavaSwing.getContentPane().add(lblDelta_Val);
slider_Ksize.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent arg0) {
if (slider_Ksize.getValue() % 2 == 0) {
slider_Ksize.setValue(slider_Ksize.getValue() + 1);
}
lblKsize_Val.setText(slider_Ksize.getValue() + "");
BufferedImage newImage = matToBufferedImage(Laplacian(temp, slider_Ksize.getValue(), slider_Scale.getValue(), slider_Delta.getValue()));
lblNewLabel.setIcon(new ImageIcon(newImage));
}
});
slider_Scale.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent arg0) {
lblScale_Val.setText(slider_Scale.getValue() + "");
BufferedImage newImage = matToBufferedImage(Laplacian(temp, slider_Ksize.getValue(), slider_Scale.getValue(), slider_Delta.getValue()));
lblNewLabel.setIcon(new ImageIcon(newImage));
}
});
slider_Delta.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent arg0) {
lblDelta_Val.setText(slider_Delta.getValue() + "");
BufferedImage newImage = matToBufferedImage(Laplacian(temp, slider_Ksize.getValue(), slider_Scale.getValue(), slider_Delta.getValue()));
lblNewLabel.setIcon(new ImageIcon(newImage));
}
});
}
public Mat Laplacian(Mat source,int ksize,double scale,double delta){
Mat destination=new Mat(source.rows(),source.cols(),source.type());
Imgproc.Laplacian(source, destination, -1,ksize,scale,delta);
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;
}
}
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