Java tutorial
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package imagegame; import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.Graphics; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.image.BufferedImage; import java.awt.image.DataBufferByte; import java.lang.reflect.Field; //import java.util.List; import java.util.concurrent.Executors; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.TimeUnit; import java.util.logging.Level; import java.util.logging.Logger; import javax.swing.JOptionPane; import javax.swing.JPanel; //import javafx.geometry.Rectangle2D; import org.opencv.core.Core; import org.opencv.core.Mat; //import org.opencv.core.MatOfByte; //import org.opencv.imgcodecs.Imgcodecs; import org.opencv.videoio.VideoCapture; /** * * @author ruhuayan */ public class Camera extends javax.swing.JFrame { private ScheduledExecutorService timer; private VideoCapture videoCapture; private BufferedImage image; public Camera() { super("Camera - click screen to take a picture"); initComponents(); setLayout(new BorderLayout()); setLibraryPath(); System.loadLibrary(Core.NATIVE_LIBRARY_NAME); videoCapture = new VideoCapture(); videoCapture.open(0); System.out.println("Camera open: " + videoCapture.isOpened()); if (videoCapture.isOpened()) { this.addWindowListener(new WindowAdapter() { @Override public void windowClosing(WindowEvent e) { // Implementation here stop(); System.out.println("Camera released"); } });//end WindowListener JPanel cameraJPanel = new JPanel() { @Override public void paint(Graphics g) { g.drawImage(image, 0, 0, this); } }; cameraJPanel.setPreferredSize(new Dimension(420, 500)); add(cameraJPanel, BorderLayout.NORTH); Runnable frameGrabber; frameGrabber = () -> { Mat mat = new Mat(); videoCapture.read(mat); image = mat2BufferedImage(mat); //g.drawImage(image, 0, 0,this); cameraJPanel.repaint(); // rectList.stream().forEach((Rectangle2D rect) -> { // g2d.strokeRect(rect.getMinX(), rect.getMinY(), rect.getWidth(), rect.getHeight()); // }); }; //end frameGrabber this.timer = Executors.newSingleThreadScheduledExecutor(); this.timer.scheduleAtFixedRate(frameGrabber, 0, 133, TimeUnit.MILLISECONDS); } else {//if videoCapture.isOpen() is false JOptionPane.showMessageDialog(null, "You have no camera installed"); } } private static void setLibraryPath() { try { System.setProperty("java.library.path", "lib/"); Field fieldSysPath = ClassLoader.class.getDeclaredField("sys_paths"); fieldSysPath.setAccessible(true); fieldSysPath.set(null, null); } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException ex) { throw new RuntimeException(ex); } } public static BufferedImage mat2BufferedImage(Mat mat) { // MatOfByte buffer = new MatOfByte(); // Imgcodecs.imencode(".png", mat, buffer); int type = mat.channels() > 1 ? BufferedImage.TYPE_3BYTE_BGR : BufferedImage.TYPE_BYTE_GRAY; BufferedImage image = new BufferedImage(mat.cols(), mat.rows(), type); mat.get(0, 0, ((DataBufferByte) image.getRaster().getDataBuffer()).getData()); return image; //return new Image(new ByteArrayInputStream(buffer.toArray())); } public BufferedImage getCameraImage() { return image; } public void stop() { timer.shutdown(); videoCapture.release(); try { timer.awaitTermination(133, TimeUnit.MILLISECONDS); } catch (InterruptedException ex) { Logger.getLogger(Camera.class.getName()).log(Level.SEVERE, null, ex); } } /** * This method is called from within the constructor to initialize the form. * WARNING: Do NOT modify this code. The content of this method is always * regenerated by the Form Editor. */ @SuppressWarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents private void initComponents() { setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGap(0, 400, Short.MAX_VALUE)); layout.setVerticalGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGap(0, 300, Short.MAX_VALUE)); pack(); }// </editor-fold>//GEN-END:initComponents /** * @param args the command line arguments */ public static void main(String args[]) { /* Set the Nimbus look and feel */ //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) "> /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel. * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html */ try { for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { if ("Nimbus".equals(info.getName())) { javax.swing.UIManager.setLookAndFeel(info.getClassName()); break; } } } catch (ClassNotFoundException ex) { java.util.logging.Logger.getLogger(Camera.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (InstantiationException ex) { java.util.logging.Logger.getLogger(Camera.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { java.util.logging.Logger.getLogger(Camera.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(Camera.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } //</editor-fold> /* Create and display the form */ java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new Camera().setVisible(true); } }); } // Variables declaration - do not modify//GEN-BEGIN:variables // End of variables declaration//GEN-END:variables }