详解使用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(); 
  } 
 
} 

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