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 gui; import java.awt.Graphics; import java.awt.Image; import java.awt.image.BufferedImage; import java.io.ByteArrayInputStream; import javax.imageio.ImageIO; import org.opencv.core.Core; import org.opencv.core.Mat; import org.opencv.core.MatOfByte; import org.opencv.videoio.VideoCapture; /** * * @author erandi */ public class WebCamTesting extends javax.swing.JFrame { /** * Creates new form WebCamTesting */ //definitions private DaemonThread myThread = null; int count = 0; VideoCapture webSource = null; Mat frame = new Mat(); MatOfByte mem = new MatOfByte(); //class of thread class DaemonThread implements Runnable { protected volatile boolean runnable = false; @Override public void run() { synchronized (this) { while (runnable) { if (webSource.grab()) { try { webSource.retrieve(frame); //Highgui.imencode(".bmp", frame, mem); Image im = ImageIO.read(new ByteArrayInputStream(mem.toArray())); BufferedImage buff = (BufferedImage) im; Graphics g = jPanelVideo.getGraphics(); if (g.drawImage(buff, 0, 0, getWidth(), getHeight() - 150, 0, 0, buff.getWidth(), buff.getHeight(), null)) if (runnable == false) { System.out.println("Going to wait()"); this.wait(); } } catch (Exception ex) { System.out.println("Error"); } } } } } } public WebCamTesting() { initComponents(); } /** * 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() { jPanelVideo = new javax.swing.JPanel(); jButtonStart = new javax.swing.JButton(); jButtonPause = new javax.swing.JButton(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); javax.swing.GroupLayout jPanelVideoLayout = new javax.swing.GroupLayout(jPanelVideo); jPanelVideo.setLayout(jPanelVideoLayout); jPanelVideoLayout.setHorizontalGroup(jPanelVideoLayout .createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGap(0, 454, Short.MAX_VALUE)); jPanelVideoLayout.setVerticalGroup(jPanelVideoLayout .createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGap(0, 335, Short.MAX_VALUE)); jButtonStart.setText("Start"); jButtonStart.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButtonStartActionPerformed(evt); } }); jButtonPause.setText("Pause"); jButtonPause.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButtonPauseActionPerformed(evt); } }); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup().addGap(121, 121, 121).addComponent(jButtonStart) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .addComponent(jButtonPause).addGap(117, 117, 117)) .addGroup(layout.createSequentialGroup().addGap(29, 29, 29) .addComponent(jPanelVideo, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addContainerGap(40, Short.MAX_VALUE))); layout.setVerticalGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup().addContainerGap() .addComponent(jPanelVideo, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 31, Short.MAX_VALUE) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jButtonPause).addComponent(jButtonStart)) .addGap(55, 55, 55))); pack(); }// </editor-fold>//GEN-END:initComponents private void jButtonStartActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButtonStartActionPerformed // TODO add your handling code here: webSource = new VideoCapture(0); //video capture from default cam myThread = new DaemonThread(); //create object from thread class Thread t = new Thread(myThread); t.setDaemon(true); myThread.runnable = true; t.start(); //start thread jButtonStart.setEnabled(false); //deactivate start button jButtonPause.setEnabled(true); // activate pause button }//GEN-LAST:event_jButtonStartActionPerformed private void jButtonPauseActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButtonPauseActionPerformed // TODO add your handling code here: myThread.runnable = false; //stop thread jButtonPause.setEnabled(false); //activate start jButtonStart.setEnabled(true); //deactivate pause webSource.release(); }//GEN-LAST:event_jButtonPauseActionPerformed /** * @param args the command line arguments */ public static void main(String args[]) { /* Set the Nimbus look and feel */ System.loadLibrary(Core.NATIVE_LIBRARY_NAME); // load native library of opencv /* Create and display the form */ java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new WebCamTesting().setVisible(true); } }); } // Variables declaration - do not modify//GEN-BEGIN:variables private javax.swing.JButton jButtonPause; private javax.swing.JButton jButtonStart; private javax.swing.JPanel jPanelVideo; // End of variables declaration//GEN-END:variables }