如何使用OpenCV在Java Swing中显示来自3个网络摄像头的视频流？
我可以为1台相机做到这一点，但我至少无法成功为2台相机做到这一点。
这是我的代码，试图显示2个摄像机流。即使相机启动，我也没有收到任何视频。
public class Test1 extends javax.swing.JFrame {
// definitions
private DaemonThread myThread=null;
private DaemonThread2 secondThread=null;
int count=0;
VideoCapture webSource=null;
VideoCapture webSource2=null;
Mat frame=new Mat();
MatOfByte mem = new MatOfByte();
Mat frame2=new Mat();
MatOfByte mem2 = new MatOfByte();
class DaemonThread implements Runnable
{
protected volatile boolean runnable = false;
@Override
public void run()
{
synchronized(this)
{
while(runnable)
{
if(webSource.grab())
{
try
{
webSource.retrieve(frame);
//webSource2.retrieve(frame2);
Highgui.imencode(".bmp", frame, mem);
Image im = ImageIO.read(new ByteArrayInputStream(mem.toArray()));
// Highgui.imencode(".bmp", frame2, mem2);
// Image im2 = ImageIO.read(new ByteArrayInputStream(mem2.toArray()));
BufferedImage buff = (BufferedImage) im;
Graphics g=jPanel1.getGraphics();
// BufferedImage buff2 = (BufferedImage) im2;
// Graphics g2=jPanel2.getGraphics();
if (g.drawImage(buff, 0, 0, getWidth(), getHeight() -150 , 0, 0, buff.getWidth(), buff.getHeight(), null))
// if (g2.drawImage(buff2, 0, 0, getWidth(), getHeight() -150 , 0, 0, buff2.getWidth(), buff2.getHeight(), null))
if(runnable == false)
{
System.out.println("Going to wait()");
this.wait();
}
}
catch(Exception ex)
{
System.out.println("Error");
}
}
}
}
}
}
class DaemonThread2 implements Runnable
{
protected volatile boolean runnable = false;
@Override
public void run()
{
synchronized(this)
{
while(runnable)
{
if(webSource2.grab())
{
try
{
webSource2.retrieve(frame2);
//webSource2.retrieve(frame2);
Highgui.imencode(".bmp", frame2, mem2);
Image im = ImageIO.read(new ByteArrayInputStream(mem2.toArray()));
// Highgui.imencode(".bmp", frame2, mem2);
// Image im2 = ImageIO.read(new ByteArrayInputStream(mem2.toArray()));
BufferedImage buff = (BufferedImage) im;
Graphics g=jPanel2.getGraphics();
// BufferedImage buff2 = (BufferedImage) im2;
// Graphics g2=jPanel2.getGraphics();
if (g.drawImage(buff, 0, 0, getWidth(), getHeight() -150 , 0, 0, buff.getWidth(), buff.getHeight(), null))
// if (g2.drawImage(buff2, 0, 0, getWidth(), getHeight() -150 , 0, 0, buff2.getWidth(), buff2.getHeight(), null))
if(runnable == false)
{
System.out.println("Going to wait()");
this.wait();
}
}
catch(Exception ex)
{
System.out.println("Error");
}
}
}
}
}
}
/**
* Creates new form Test
*/
public Test1() {
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">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
jButton1 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
jPanel2 = new javax.swing.JPanel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 190, Short.MAX_VALUE)
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 177, Short.MAX_VALUE)
);
jButton1.setText("Start");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jButton2.setText("Pause");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
jPanel2.setLayout(jPanel2Layout);
jPanel2Layout.setHorizontalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 0, Short.MAX_VALUE)
);
jPanel2Layout.setVerticalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 169, Short.MAX_VALUE)
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGap(74, 74, 74)
.addComponent(jButton1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 141, Short.MAX_VALUE)
.addComponent(jButton2)
.addGap(67, 67, 67))
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGap(19, 19, 19)
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 78, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton1)
.addComponent(jButton2))
.addContainerGap())
);
pack();
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
webSource=new VideoCapture(0);
webSource2=new VideoCapture(1);
myThread=new DaemonThread();
Thread t=new Thread(myThread);
t.setDaemon(true);
myThread.runnable=true;
t.start();
secondThread=new DaemonThread2();
Thread t2=new Thread(secondThread);
t2.setDaemon(true);
t2.start();
jButton1.setEnabled(false);
jButton2.setEnabled(true);
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
myThread.runnable=false;
jButton2.setEnabled(false);
jButton1.setEnabled(true);
webSource.release();
}
/**
* @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(Test1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Test1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Test1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Test1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
//</editor-fold>
System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Test1().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
// End of variables declaration
}