找到一篇关于java调用硬件(摄像头),一篇挺有意思的文章,索性转一下:
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转自:http://www.usnews.com/education
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首先到sun下载最新的jmf,然后安装。http://java.sun.com/products/java-media/jmf/index.jsp
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。
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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");
}
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