java调用摄像头拍照录像.doc

首先到sun下载最新的jmf，然后安装。
然后，说一下需求
1． 用摄像头拍照
2． 在文本框输入文件名
3． 按下拍照按钮，获取摄像头内的图像
4． 在拍下的照片上有一红框截取固定大小的照片。
5． 保存为本地图像为jpg格式，不得压缩画质
技术关键，相信也是大家最感兴趣的部分也就是如何让一个摄像头工作，并拍下一张照片了。

利用jmf，代码很简单：

//利用这三个类分别获取摄像头驱动，和获取摄像头内的图像流，获取到的图像流是一个swing的component组件类

public static player player = null;
private capturedeviceinfo di = null;
private medialocator ml = null;

//文档中提供的驱动写法，为何这么写我也不知：）

string str1 = "vfw:logitech usb video camera:0 ";
string str2 = "vfw:microsoft wdm image capture (win32):0 ";
di = capturedevicemanager.getdevice(str2);
ml = di.getlocator();
try
{
player = manager.createrealizedplayer(ml);
player.start();
component comp;
if ((comp = player.getvisualcomponent()) != null)
{
add(comp, borderlayout.north);
}
}
catch (exception e)
{
e.printstacktrace();
}

接下来就是点击拍照，获取摄像头内的当前图像。

代码也是很简单：

private jbutton capture;
private buffer buf = null;
private buffertoimage btoi = null;
private imagepanel imgpanel = null;
private image img = null;
private imagepanel imgpanel = null;

jcomponent c = (jcomponent) e.getsource();
if (c == capture)//如果按下的是拍照按钮
{
framegrabbingcontrol fgc =(framegrabbingcontrol) player.getcontrol( "javax.media.control.framegrabbingcontrol ");
buf = fgc.grabframe(); // 获取当前祯并存入buffer类
btoi = new buffertoimage((videoformat) buf.getformat());
img = btoi.createimage(buf); // show the image
imgpanel.setimage(img);
}

保存图像的就不多说了，以下为示例代码

bufferedimage bi = (bufferedimage) createimage(imgwidth, imgheight);
graphics2d g2 = bi.creategraphics();
g2.drawimage(img, null, null);
fileoutputstream out = null;
try
{
out = new fileoutputstream(s);
}
catch (java.io.filenotfoundexception io)
{
system.out.println( "file not found ");
}

jpegimageencoder encoder = jpegcodec.createjpegencoder(out);
jpegencodeparam param = encoder.getdefaultjpegencodeparam(bi);
param.setquality(1f, false);//不压缩图像
encoder.setjpegencodeparam(param);
try
{
encoder.encode(bi);
out.close();
}
catch (java.io.ioexception io)
{
system.out.println( "ioexception ");
}

把.jar 文件导入。下载了jmf后需要安装，安装后你的那个jmf目录下就会有一个lib文件夹里面有jar文件，然后打开eclipse，右键选择你的工程 -〉属性-〉java build path-> library-〉add external jars 找到你的jmf目录下lib的那个文件夹然后选中那些文件导入就ok了。
然后利用工具提供的导入文件帮助,一个一个导就OK了

例子：
package com.creatplay;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Panel;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import javax.media.Buffer;
import javax.media.CannotRealizeException;
import javax.media.CaptureDeviceInfo;
import javax.media.CaptureDeviceManager;
import javax.media.Manager;
import javax.media.MediaLocator;
import javax.media.NoPlayerException;
import javax.media.Player;
import javax.media.control.FrameGrabbingControl;
import javax.media.format.VideoFormat;
import javax.media.util.BufferToImage;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

import com.sun.image.codec.jpeg.ImageFormatException;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import com.sun.media.protocol.vfw.DataSource;

public class FirstCapture extends JPanel implements ActionListener{

private CaptureDeviceInfo captureDeviceInfo=null;
private MediaLocator mediaLocator=null;
private static Player player=null;
private ImagePanel imagePanel=null;
private JButton capture;
private Buffer buffer=null;
private VideoFormat videoFormat=null;
private BufferToImage bufferToImage=null;
private Image image=null;

public FirstCapture()
{

setLayout(new BorderLayout());
setSize(320,550);

captureDeviceInfo=CaptureDeviceManager.getDevice("vfw:Microsoft WDM Image Capture (Win32):0"); //这里放置的是视频驱动

mediaLocator=new MediaLocator("vfw://0"); //这里是视频地址
imagePanel=new ImagePanel();
capture=new JButton("拍照");
capture.addActionListener(this);
DataSource ds = new DataSource();
ds.setLocator(mediaLocator);
try {
player=Manager.createRealizedPlayer(mediaLocator);
player.start();
Component comp;
Component comp1;
if((comp=player.getVisualComponent())!=null)
add(comp,BorderLayout.NORTH);
// if((comp1=player.getControlPanelComponent())!=null)
// add(comp1,BorderLayout.CENTER);
} catch (NoPlayerException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (CannotRealizeException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
add(imagePanel,BorderLayout.SOUTH);
add(capture,BorderLayout.CENTER);
}

@Override
public void print(Graphics g) {
// TODO Auto-generated method stub
super.print(g);
g.setColor(new Color(255,0,0));
g.drawLine(0, 0, 100, 100);
}

public static void main(String[] args) {
// TODO Auto-generated method stub
JFrame f = new JFrame("FirstCapture");
FirstCapture cf = new FirstCapture();

f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
player.close();
System.exit(0);}});

f.add("Center",cf);
f.pack();
f.setSize(new Dimension(320,550));
f.setVisible(true);
}

public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
FrameGrabbingControl fgc=(FrameGrabbingControl)player.getControl("javax.media.control.FrameGrabbingControl");
buffer=fgc.grabFrame();
bufferToImage=new BufferToImage((VideoFormat)buffer.getFormat());
image=bufferToImage.createImage(buffer);
imagePanel.setImage(image);
saveImage(image,"D:/test.jpg");
}
public static void saveImage(Image image,String path)
{
BufferedImage bi=new BufferedImage(image.getWidth(null),image.getHeight(null),BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = bi.createGraphics();
g2.drawImage(image, null, null);
FileOutputStream fos=null;
try {
fos=new FileOutputStream(path);

} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
JPEGImageEncoder je=JPEGCodec.createJPEGEncoder(fos);
JPEGEncodeParam jp=je.getDefaultJPEGEncodeParam(bi);
jp.setQuality(0.5f, false);
je.setJPEGEncodeParam(jp);
try {
je.encode(bi);
fos.close();
} catch (ImageFormatException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}
class ImagePanel extends Panel
{
public Image myimg = null;

public ImagePanel()
{
setLayout(null);
setSize(320,240);
}

public void setImage(Image img)
{
this.myimg = img;
repaint();
}

public void paint(Graphics g)
{
if (myimg != null)
{
g.drawImage(myimg, 0, 0, this);
}

}
}

}

你需要去sun公司下载jmf安装程序，安装后会有一个注册机，在里面查看你所在视频驱动和地址然后粘到红色代码部分。
jmf最好安装到jdk跟目录下，这样可免去配置环境变量，在一个你在新建工程后需要将你下载安装后的那几个jar包引到工程里，包括：jmf.jar,customizer.jar,mediaplayer.jar,multiplayer.jar可能里面由一两个包用不到但是以防万一都加上吧。