Java in the use of JMF to write camera photography program

The program first downloads the latest JMF to Sun and installs it. http://java.sun.com/products/java-media/jmf/index.jsp

Then, say the need

1. Take a picture with a camera

2. Enter a file name in the text box

3. Press the photo button to get the image inside the camera

4. There is a red box on the photo that captures the fixed size of the picture.

5. Save as a local image in JPG format, no compression

The key to the technology, I believe the most interesting part is how to get a camera to work, and take a picture.

With JMF, the code is simple:

Using these three classes to get the camera driver, and to obtain the image stream inside the camera, the image stream is captured by a swing component component class

public static player player = null;
private Capturedeviceinfo di = null;
private Medialocator ml = null;

The driver writing provided in the document, why do I not know:

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 ();
}

The next step is to click the photo to get the current image inside the camera.

The code is also very simple:

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)//If the camera button is pressed
{
Framegrabbingcontrol FGC = (Framegrabbingcontrol) player.getcontrol ("Javax.media.control.FrameGrabbingControl");
BUF = Fgc.grabframe (); Get the current Zhen and deposit it into the buffer class
Btoi = new Buffertoimage ((Videoformat) Buf.getformat ());
img = btoi.createimage (BUF); Show the image
Imgpanel.setimage (IMG);
}

Save the image is not much to say, the following is the sample code

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);/uncompressed image
Encoder.setjpegencodeparam (param);
Try
{
Encoder.encode (BI);
Out.close ();
}
catch (java.io.IOException io)
{
System.out.println ("IOException");
}