我是初学者，在java中尝试创建一个图像捕获程序，它既记录用户又允许将图像移动到GUI上捕获的图像区域，我唯一的问题是记录似乎被切断了即使我指定了应该显示的区域，任何帮助都会被高度评价。
package gesture.recognition;
import com.sun.xml.internal.ws.api.Component;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.awt.*;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.border.EtchedBorder;
import javax.swing.border.TitledBorder;
import javax.swing.*;
import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.MatOfByte;
import org.opencv.core.Size;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;
import org.opencv.videoio.VideoCapture;
import static org.opencv.videoio.Videoio.CV_CAP_PROP_FRAME_HEIGHT;
import static org.opencv.videoio.Videoio.CV_CAP_PROP_FRAME_WIDTH;
public class GestureRecognition extends javax.swing.JFrame {
private DaemonThread myThread = null;
int count = 0;
VideoCapture webSource = null;
Mat vid = new Mat();
MatOfByte mem = new MatOfByte();
int CANVAS_INITIAL_WIDTH =400;
int CANVAS_INITIAL_HEIGHT =500;
int Video_display=400;
int Button_Area=200;
float h,s,v;
int alpha,r,g,b;
BufferedImage img = null;
File f = null;
Mat hsv = new Mat();
class Canvas extends JPanel
{
// Called every time there is a change in the canvas contents.
public void paintComponent(Graphics g)
{
super.paintComponent(g);
draw(g);
}
}
class DaemonThread implements Runnable
{
protected volatile boolean runnable = false;
@Override
public void run()
{
synchronized(this)
{
while(runnable)
{
if(webSource.grab())
{
try
{
webSource.retrieve(vid);
Imgcodecs.imencode(".jpg", vid, mem);
Image im = ImageIO.read(new ByteArrayInputStream(mem.toArray()));
BufferedImage buff = (BufferedImage) im;
Graphics g=freehandSliderPanel.getGraphics();
if (g.drawImage(im, 0, 0, null));
// 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(IOException | InterruptedException ex)
{
System.out.println("Error");
}
}
}
}
}
}
private Canvas canvas;
private JPanel controlPanel;
private JPanel messageArea;
private JButton jButton1;
private JPanel freehandSliderPanel;
public GestureRecognition()
{
setTitle("Gesture Recognition");
setLayout(new BorderLayout()); // Layout manager for the frame.
// Canvas
canvas = new Canvas();
canvas.setBorder(new TitledBorder(new EtchedBorder(), "Video"));
canvas.setPreferredSize(new Dimension(CANVAS_INITIAL_WIDTH, CANVAS_INITIAL_HEIGHT));
add(canvas, BorderLayout.WEST);
controlPanel = new JPanel();
controlPanel.setBorder(new TitledBorder(new EtchedBorder(), "Picture"));
controlPanel.setPreferredSize(new Dimension(Video_display, CANVAS_INITIAL_HEIGHT));
// the following two lines put the control panel in a scroll pane (nicer?).
JScrollPane controlPanelScrollPane = new JScrollPane(controlPanel);
controlPanelScrollPane.setPreferredSize(new Dimension(Video_display + 30, CANVAS_INITIAL_HEIGHT));
add(controlPanelScrollPane, BorderLayout.EAST);
messageArea = new JPanel();
messageArea.setBackground(canvas.getBackground());
messageArea.setBorder(new TitledBorder(new EtchedBorder(), "Message Area"));
messageArea.setPreferredSize(new Dimension(Video_display + CANVAS_INITIAL_WIDTH, Button_Area));
add(messageArea, BorderLayout.SOUTH);
jButton1 = new JButton("Start Video");
jButton1.setPreferredSize(new Dimension(Button_Area - 10, 50));
messageArea.add(jButton1);
freehandSliderPanel = new JPanel();
freehandSliderPanel.setPreferredSize(new Dimension(CANVAS_INITIAL_WIDTH - 20, 90));
canvas.setLayout(new GridLayout(0, 1));
freehandSliderPanel.setBorder(new TitledBorder(new EtchedBorder(), "Display"));
canvas.add(freehandSliderPanel,BorderLayout.CENTER);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
setLocationRelativeTo(null);
setVisible(true);
jButton1.setText("Video Capture");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
}
void draw(Graphics g)
{
}// end draw method
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
webSource =new VideoCapture(0);
myThread = new DaemonThread();
Thread t = new Thread(myThread);
t.setDaemon(true);
myThread.runnable = true;
t.start();
jButton1.setEnabled(false); //start button
// jButton2.setEnabled(true); // stop button
}
public static void main(String args[]) {
System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
GestureRecognition GestureRecognitionInstance = new GestureRecognition();
/*Create and display the form */
/* java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
}
});
*/ }
}
到目前为止，它显示了GUI，但正如您所看到的，它只是简单地切断了图像
