使用JavaCV/OpenCV抓取并存储摄像头图像

本程序通过JFrame实时显示本机摄像头图像，并将图像存储到一个缓冲区，当用户用鼠标点击JFrame中任何区域时，显示抓取图像的简单动画，同时保存缓冲区的图像到磁盘文件中。点击JFrame关闭按钮可以退出程序。

实现：

import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.Timer;

import com.googlecode.javacv.CanvasFrame;
import com.googlecode.javacv.OpenCVFrameGrabber;
import com.googlecode.javacv.cpp.opencv_core.IplImage;
import static com.googlecode.javacv.cpp.opencv_core.cvReleaseImage;

/**
*
* Use JavaCV/OpenCV to capture camera images
*
* There are two functions in this demo:
* 1) show real-time camera images
* 2) capture camera images by mouse-clicking anywhere in the JFrame,
* the jpg file is saved in a hard-coded path.
*
* @author ljs
* 2011-08-19
*
*/
public class CameraCapture {
public static String savedImageFile = "c:\\tmp\\my.jpg";

//timer for image capture animation
static class TimerAction implements ActionListener {
private Graphics2D g;
private CanvasFrame canvasFrame;
private int width,height;

private int delta=10;
private int count = 0;

private Timer timer;
public void setTimer(Timer timer){
this.timer = timer;
}

public TimerAction(CanvasFrame canvasFrame){
this.g = (Graphics2D)canvasFrame.getCanvas().getGraphics();
this.canvasFrame = canvasFrame;
this.width = canvasFrame.getCanvas().getWidth();
this.height = canvasFrame.getCanvas().getHeight();
}
public void actionPerformed(ActionEvent e) {
int offset = delta*count;
if(width-offset>=offset && height-offset >= offset) {
g.drawRect(offset, offset, width-2*offset, height-2*offset);
canvasFrame.repaint();
count++;
}else{
//when animation is done, reset count and stop timer.
timer.stop();
count = 0;
}
}
}

public static void main(String[] args) throws Exception {
//open camera source
OpenCVFrameGrabber grabber = new OpenCVFrameGrabber(0);
grabber.start();

//create a frame for real-time image display
CanvasFrame canvasFrame = new CanvasFrame("Camera");
IplImage image = grabber.grab();
int width = image.width();
int height = image.height();
canvasFrame.setCanvasSize(width, height);

//onscreen buffer for image capture
final BufferedImage bImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D bGraphics = bImage.createGraphics();

//animation timer
TimerAction timerAction = new TimerAction(canvasFrame);
final Timer timer=new Timer(10, timerAction);
timerAction.setTimer(timer);

//click the frame to capture an image
canvasFrame.getCanvas().addMouseListener(new MouseAdapter(){
public void mouseClicked(MouseEvent e){
timer.start(); //start animation
try {
ImageIO.write(bImage, "jpg", new File(savedImageFile));
} catch (IOException e1) {
e1.printStackTrace();
}
}
});

//real-time image display
while(canvasFrame.isVisible() && (image=grabber.grab()) != null){
if(!timer.isRunning()) { //when animation is on, pause real-time display
canvasFrame.showImage(image);
//draw the onscreen image simutaneously
bGraphics.drawImage(image.getBufferedImage(),null,0,0);
}
}

//release resources
cvReleaseImage(image);
grabber.stop();
canvasFrame.dispose();
}

}