Obtain images from webcam

Hi everybody.
I need to get video from my webcam and then capture frames from this video.
Can you help me?
Thanks!!!

Hi Ivan,
there exists a driver for USB-Cameras.
It should be possible to use this to grab the pictures.
This driver is not supported by NI and not investigated anymore. So if you have some questions about the driver you only can ask in the forum for some help.
En general you should be aware that the pictures of a webcam are bad quality and for a industrial aplication its far to bad.
I hope this helps you,
Greetins, RMathews

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  • Capturing an image from webcam

    hi, i'm trying to capture a image from a webcam, but i don't have a clue of how to do this, could anyone help me with samples or books.
    thanks.

    hi
    so as i understood u want to access the USB and make whats called camera interaction i worked with my webcam and i generate a video stream and i'm working now to sample this video
    i found these class on the internet u have to make a littel changes like camera defention
    * File: DeviceInfo.java.java
    * created 24.07.2001 21:44:12 by David Fischer, [email protected]
    import java.awt.Dimension;
    import javax.media.*;
    import javax.media.control.*;
    import javax.media.format.*;
    import javax.media.protocol.*;
    public class DeviceInfo
         public static Format formatMatches (Format format, Format supported[] )
              if (supported == null)
                   return null;
              for (int i = 0;  i < supported.length;  i++)
                   if (supported.matches(format))
                        return supported[i];
              return null;
         public static boolean setFormat(DataSource dataSource, Format format)
              boolean formatApplied = false;
              FormatControl formatControls[] = null;
              formatControls = ((CaptureDevice) dataSource).getFormatControls();
              for (int x = 0; x < formatControls.length; x++)
                   if (formatControls[x] == null)
                        continue;
                   Format supportedFormats[] = formatControls[x].getSupportedFormats();
                   if (supportedFormats == null)
                        continue;
                   if (DeviceInfo.formatMatches(format, supportedFormats) != null)
                        formatControls[x].setFormat(format);
                        formatApplied = true;
              return formatApplied;
         public static boolean isVideo(Format format)
              return (format instanceof VideoFormat);
         public static boolean isAudio(Format format)
              return (format instanceof AudioFormat);
         public static String formatToString(Format format)
              if (isVideo(format))
                   return videoFormatToString((VideoFormat) format);
              if (isAudio(format))
                   return audioFormatToString((AudioFormat) format);
              return ("--- unknown media device format ---");
         public static String videoFormatToString(VideoFormat videoFormat)
              StringBuffer result = new StringBuffer();
              // add width x height (size)
              Dimension d = videoFormat.getSize();
              result.append("size=" + (int) d.getWidth() + "x" + (int) d.getHeight() + ", ");
              // try to add color depth
              if (videoFormat instanceof IndexedColorFormat)
                   IndexedColorFormat f = (IndexedColorFormat) videoFormat;
                   result.append("color depth=" + f.getMapSize() + ", ");
              // add encoding
              result.append("encoding=" + videoFormat.getEncoding() + ", ");
              // add max data length
              result.append("maxdatalength=" + videoFormat.getMaxDataLength() + "");
              return result.toString();
         public static String audioFormatToString(AudioFormat audioFormat)
              StringBuffer result = new StringBuffer();
              // short workaround
              result.append(audioFormat.toString().toLowerCase());
              return result.toString();
    the second class:
    * File: MyDataSinkListener.java
    * created 24.07.2001 21:41:47 by David Fischer, [email protected]
    * Decription: simple data sink listener, used to check for end of stream
    import javax.media.datasink.*;
    public class MyDataSinkListener implements DataSinkListener
         boolean endOfStream = false;
         public void dataSinkUpdate(DataSinkEvent event)
              if (event instanceof javax.media.datasink.EndOfStreamEvent)
                   endOfStream = true;
         public void waitEndOfStream(long checkTimeMs)
              while (! endOfStream)
                   Stdout.log("datasink: waiting for end of stream ...");
                   try { Thread.currentThread().sleep(checkTimeMs); } catch (InterruptedException ie) {}
              Stdout.log("datasink: ... end of stream reached.");
    * File: MyDataSinkListener.java
    * created 24.07.2001 21:41:47 by David Fischer, [email protected]
    * Decription: simple data sink listener, used to check for end of stream
    import javax.media.datasink.*;
    public class MyDataSinkListener implements DataSinkListener
         boolean endOfStream = false;
         public void dataSinkUpdate(DataSinkEvent event)
              if (event instanceof javax.media.datasink.EndOfStreamEvent)
                   endOfStream = true;
         public void waitEndOfStream(long checkTimeMs)
              while (! endOfStream)
                   Stdout.log("datasink: waiting for end of stream ...");
                   try { Thread.currentThread().sleep(checkTimeMs); } catch (InterruptedException ie) {}
              Stdout.log("datasink: ... end of stream reached.");
    }[i]the 3rd class:/******************************************************
    * File: Stdout.java.java
    * created 24.07.2001 21:44:46 by David Fischer, [email protected]
    * Description: utility class for standard output
    public class Stdout
         public static void log(String msg)
              System.out.println(msg);
         public static void logAndAbortException(Exception e)
              log("" + e);
              flush();
              System.exit(0);
         public static void logAndAbortError(Error e)
              log("" + e);
              flush();
              System.exit(0);
         public static void flush()
              System.out.flush();
    the 4rt is :
    * File: TestQuickCamPro.java
    * created 24.07.2001 21:40:13 by David Fischer, [email protected]
    * Description: this test program will capture the video and audio stream
    * from a Logitech QuickCam� Pro 3000 USB camera for 10 seconds and stores
    * it on a file, named "testcam.avi". You can use the microsoft windows
    * media player to display this file.
    * operating system: Windows 2000
    * required hardware:  Logitech QuickCam� Pro 3000
    * required software: jdk 1.3 or jdk1.4 plus jmf2.1.1 (www.javasoft.com)
    * source files: DeviceInfo.java, MyDataSinkListener.java,
    *               Stdout.java, TestQuickCamPro.java
    * You can just start this program with "java TestQuickCamPro"
    * hint: please make shure that you setup first the logitech camerea drives
    * and jmf2.1.1 correctly. "jmf.jar" must be part of your CLASSPATH.
    * useful links:
    * - http://java.sun.com/products/java-media/jmf/2.1.1/index.html
    * - http://java.sun.com/products/java-media/jmf/2.1.1/solutions/index.html
    * with some small modifications, this program will work with any USB camera.
    import java.io.*;
    import javax.media.*;
    import javax.media.control.*;
    import javax.media.datasink.*;
    import javax.media.format.*;
    import javax.media.protocol.*;
    public class TestQuickCamPro
         private static boolean                    debugDeviceList = false;
         private static String                    defaultVideoDeviceName = "vfw:Microsoft WDM Image Capture (Win32):0";
         private static String                    defaultAudioDeviceName = "DirectSoundCapture";
         private static String                    defaultVideoFormatString = "size=176x144, encoding=yuv, maxdatalength=38016";
         private static String                    defaultAudioFormatString = "linear, 16000.0 hz, 8-bit, mono, unsigned";
         private static CaptureDeviceInfo     captureVideoDevice = null;
         private static CaptureDeviceInfo     captureAudioDevice = null;
         private static VideoFormat               captureVideoFormat = null;
         private static AudioFormat               captureAudioFormat = null;
         public static void main(String args[])
              // get command line arguments
              for (int x = 0; x < args.length; x++)
                   // -dd = debug devices list -> display list of all media devices - and exit
                   if (args[x].toLowerCase().compareTo("-dd") == 0)
                        debugDeviceList = true;
              // get a list of all media devices, search default devices and formats, and print it out if args[x] = "-dd"
              Stdout.log("get list of all media devices ...");
              java.util.Vector deviceListVector = CaptureDeviceManager.getDeviceList(null);
              if (deviceListVector == null)
                   Stdout.log("... error: media device list vector is null, program aborted");
                   System.exit(0);
              if (deviceListVector.size() == 0)
                   Stdout.log("... error: media device list vector size is 0, program aborted");
                   System.exit(0);
              for (int x = 0; x < deviceListVector.size(); x++)
                   // display device name
                   CaptureDeviceInfo deviceInfo = (CaptureDeviceInfo) deviceListVector.elementAt(x);
                   String deviceInfoText = deviceInfo.getName();
                   if (debugDeviceList)
                        Stdout.log("device " + x + ": " + deviceInfoText);
                   // display device formats
                   Format deviceFormat[] = deviceInfo.getFormats();
                   for (int y = 0; y < deviceFormat.length; y++)
                        // serach for default video device
                        if (captureVideoDevice == null)
                             if (deviceFormat[y] instanceof VideoFormat)
                             if (deviceInfo.getName().indexOf(defaultVideoDeviceName) >= 0)
                             captureVideoDevice = deviceInfo;
                             Stdout.log(">>> capture video device = " + deviceInfo.getName());
                        // search for default video format
                        if (captureVideoDevice == deviceInfo)
                             if (captureVideoFormat == null)
                             if (DeviceInfo.formatToString(deviceFormat[y]).indexOf(defaultVideoFormatString) >= 0)
                             captureVideoFormat = (VideoFormat) deviceFormat[y];
                             Stdout.log(">>> capture video format = " + DeviceInfo.formatToString(deviceFormat[y]));
                        // serach for default audio device
                        if (captureAudioDevice == null)
                             if (deviceFormat[y] instanceof AudioFormat)
                             if (deviceInfo.getName().indexOf(defaultAudioDeviceName) >= 0)
                             captureAudioDevice = deviceInfo;
                             Stdout.log(">>> capture audio device = " + deviceInfo.getName());
                        // search for default audio format
                        if (captureAudioDevice == deviceInfo)
                             if (captureAudioFormat == null)
                             if (DeviceInfo.formatToString(deviceFormat[y]).indexOf(defaultAudioFormatString) >= 0)
                             captureAudioFormat = (AudioFormat) deviceFormat[y];
                             Stdout.log(">>> capture audio format = " + DeviceInfo.formatToString(deviceFormat[y]));
                        if (debugDeviceList)
                             Stdout.log(" - format: " +  DeviceInfo.formatToString(deviceFormat[y]));
              Stdout.log("... list completed.");
              // if args[x] = "-dd" terminate now
              if (debugDeviceList)
                   System.exit(0);
              // setup video data source
              MediaLocator videoMediaLocator = captureVideoDevice.getLocator();
              DataSource videoDataSource = null;
              try
                   videoDataSource = javax.media.Manager.createDataSource(videoMediaLocator);
              catch (IOException ie) { Stdout.logAndAbortException(ie); }
              catch (NoDataSourceException nse) { Stdout.logAndAbortException(nse); }
              if (! DeviceInfo.setFormat(videoDataSource, captureVideoFormat))
                   Stdout.log("Error: unable to set video format - program aborted");
                   System.exit(0);
              // setup audio data source
              MediaLocator audioMediaLocator = captureAudioDevice.getLocator();
              DataSource audioDataSource = null;
              try
                   audioDataSource = javax.media.Manager.createDataSource(audioMediaLocator);
              catch (IOException ie) { Stdout.logAndAbortException(ie); }
              catch (NoDataSourceException nse) { Stdout.logAndAbortException(nse); }
              if (! DeviceInfo.setFormat(audioDataSource, captureAudioFormat))
                   Stdout.log("Error: unable to set audio format - program aborted");
                   System.exit(0);
              // merge the two data sources
              DataSource mixedDataSource = null;
              try
                   DataSource dArray[] = new DataSource[2];
                   dArray[0] = videoDataSource;
                   dArray[1] = audioDataSource;
                   mixedDataSource = javax.media.Manager.createMergingDataSource(dArray);
              catch (IncompatibleSourceException ise) { Stdout.logAndAbortException(ise); }
              // create a new processor
              // setup output file format  ->> msvideo
              FileTypeDescriptor outputType = new FileTypeDescriptor(FileTypeDescriptor.MSVIDEO);
              // setup output video and audio data format
              Format outputFormat[] = new Format[2];
              outputFormat[0] = new VideoFormat(VideoFormat.INDEO50);
              outputFormat[1] = new AudioFormat(AudioFormat.GSM_MS /* LINEAR */);
              // create processor
              ProcessorModel processorModel = new ProcessorModel(mixedDataSource, outputFormat, outputType);
              Processor processor = null;
              try
                   processor = Manager.createRealizedProcessor(processorModel);
              catch (IOException e) { Stdout.logAndAbortException(e); }
              catch (NoProcessorException e) { Stdout.logAndAbortException(e); }
              catch (CannotRealizeException e) { Stdout.logAndAbortException(e); }
              // get the output of the processor
              DataSource source = processor.getDataOutput();
              // create a File protocol MediaLocator with the location
              // of the file to which bits are to be written
              MediaLocator dest = new MediaLocator("file:testcam.avi");
              // create a datasink to do the file
              DataSink dataSink = null;
              MyDataSinkListener dataSinkListener = null;
              try
                   dataSink = Manager.createDataSink(source, dest);
                   dataSinkListener = new MyDataSinkListener();
                   dataSink.addDataSinkListener(dataSinkListener);
                   dataSink.open();
              catch (IOException e) { Stdout.logAndAbortException(e); }
              catch (NoDataSinkException e) { Stdout.logAndAbortException(e); }
              catch (SecurityException e) { Stdout.logAndAbortException(e); }
              // now start the datasink and processor
              try
                   dataSink.start();
              catch (IOException e) { Stdout.logAndAbortException(e); }
              processor.start();
              Stdout.log("starting capturing ...");
              try { Thread.currentThread().sleep(10000); } catch (InterruptedException ie) {}     // capture for 10 seconds
              Stdout.log("... capturing done");
              // stop and close the processor when done capturing...
              // close the datasink when EndOfStream event is received...
              processor.stop();
              processor.close();
              dataSinkListener.waitEndOfStream(10);
              dataSink.close();
              Stdout.log("[all done]");
    }finally search with the athour name there is an additional program u must download to detect ur cam .
    i hope that is work with u

  • Capturing image from Webcam

    Hi,
    Is there any way in which Java can be used to capture images from the webcam and save it to a predefined image file name?
    Any examples out there?
    Alternatively, I could have the application written in other languages, but still, I would need my main Java app to launch this external app.
    Thanks alot.

    Hi,
    Is there any way in which Java can be used to capture
    images from the webcam and save it to a predefined
    image file name?
    Any examples out there?
    Alternatively, I could have the application written in
    other languages, but still, I would need my main Java
    app to launch this external app.
    Thanks alot.Yes, the ExampleSave from the JavaTwain package at http://www.gnome.sk does this job :)
    If you just want to see how Java Twain works with your webcam (works with a scanner too):
    - java (1.2 or higher for Windows, 1.3 or higher for Mac OS X) has to be installed on your computer
    - a scanner or camera has to be installed on your computer
    - download the trial package from http://www.gnome.sk
    - unzipp it
    - go to the examples directory of the unzipped package
    - in Windows: doubleclick the runExampleShow.bat
    - in MacOS:
        - open the Terminal window
        - change the working directory to the examples
        - run .sh file (type ExampleShow.sh or sh ExampleShow.sh)
    This will pop up the Twain Source Selection user interface. There, all your scanners and cameras which do have a twain driver should be listed. (About 90% of scanners and cameras on the market do have a twain driver for Windows, only a few do have a twain driver for MacOS.) Select one of them. The user interface of the selected scanner (camera) will appear. Confirm the scanning (you can set the scanning parameters first). The scanned image will be displayed in a separate window. To end the application, close that window.
    Running different examples, you can test scanning with hidden UI, saving the scanned image, using ADF, ...
    If there is any problem, do not hesitate to inquire about it at the technical support, email: [email protected] . I am the member of the staff :)
    Erika Kupkova

  • Errors in code that captures images from webcam

    Here is the code
    import javax.swing.*;
    import javax.swing.border.*;
    import java.io.*;
    import javax.media.*;
    import javax.media.datasink.*;
    import javax.media.format.*;
    import javax.media.protocol.*;
    import javax.media.util.*;
    import javax.media.control.*;
    import java.util.*;
    import java.awt.*;
    import java.awt.image.*;
    import java.awt.event.*;
    import com.sun.image.codec.jpeg.*;
    // import com.sun.media.vfw.VFWCapture; // JMF 2.1.1c version
    import com.sun.media.protocol.vfw.VFWCapture; // JMF 2.1.1e version
    public class JWebCam extends JFrame
    implements WindowListener, ComponentListener
    protected final static int MIN_WIDTH = 320;
    protected final static int MIN_HEIGHT = 240;
    protected static int shotCounter = 1;
    protected JLabel statusBar = null;
    protected JPanel visualContainer = null;
    protected Component visualComponent = null;
    protected JToolBar toolbar = null;
    protected MyToolBarAction formatButton = null;
    protected MyToolBarAction captureButton = null;
    protected Player player = null;
    protected CaptureDeviceInfo webCamDeviceInfo = null;
    protected MediaLocator ml = null;
    protected Dimension imageSize = null;
    protected FormatControl formatControl = null;
    protected VideoFormat currentFormat = null;
    protected Format[] videoFormats = null;
    protected MyVideoFormat[] myFormatList = null;
    protected boolean initialised = false;
    * Constructor
    public JWebCam ( String frameTitle )
    super ( frameTitle );
    try
    UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
    catch ( Exception cnfe )
    System.out.println ("Note : Cannot load look and feel settings");
    setSize ( 320, 260 ); // default size...
    addWindowListener ( this );
    addComponentListener ( this );
    getContentPane().setLayout ( new BorderLayout() );
    visualContainer = new JPanel();
    visualContainer.setLayout ( new BorderLayout() );
    getContentPane().add ( visualContainer, BorderLayout.CENTER );
    statusBar = new JLabel ("");
    statusBar.setBorder ( new EtchedBorder() );
    getContentPane().add ( statusBar, BorderLayout.SOUTH );
    * Initialise
    * @returns true if web cam is detected
    public boolean initialise ( )
    throws Exception
    return ( initialise ( autoDetect() ) );
    * Initialise
    * @params _deviceInfo, specific web cam device if not autodetected
    * @returns true if web cam is detected
    public boolean initialise ( CaptureDeviceInfo _deviceInfo )
    throws Exception
    statusBar.setText ( "Initialising...");
    webCamDeviceInfo = _deviceInfo;
    if ( webCamDeviceInfo != null )
    statusBar.setText ( "Connecting to : " + webCamDeviceInfo.getName() );
    try
    setUpToolBar();
    getContentPane().add ( toolbar, BorderLayout.NORTH );
    ml = webCamDeviceInfo.getLocator();
    if ( ml != null )
    player = Manager.createRealizedPlayer ( ml );
    if ( player != null )
    player.start();
    formatControl = (FormatControl)player.getControl ( "javax.media.control.FormatControl" );
    videoFormats = webCamDeviceInfo.getFormats();
    visualComponent = player.getVisualComponent();
    if ( visualComponent != null )
    visualContainer.add ( visualComponent, BorderLayout.CENTER );
    myFormatList = new MyVideoFormat[videoFormats.length];
    for ( int i=0; i<videoFormats.length; i++ )
    myFormatList = new MyVideoFormat ( (VideoFormat)videoFormats );
    Format currFormat = formatControl.getFormat();
    if ( currFormat instanceof VideoFormat )
    currentFormat = (VideoFormat)currFormat;
    imageSize = currentFormat.getSize();
    visualContainer.setPreferredSize ( imageSize );
    setSize ( imageSize.width, imageSize.height + statusBar.getHeight() + toolbar.getHeight() );
    else
    System.err.println ("Error : Cannot get current video format");
    invalidate();
    pack();
    return ( true );
    else
    System.err.println ("Error : Could not get visual component");
    return ( false );
    else
    System.err.println ("Error : Cannot create player");
    statusBar.setText ( "Cannot create player" );
    return ( false );
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    System.err.println ("Error : No MediaLocator for " + webCamDeviceInfo.getName() );
    statusBar.setText ( "No Media Locator for : " + webCamDeviceInfo.getName() );
    return ( false );
    catch ( IOException ioEx )
    statusBar.setText ( "Connecting to : " + webCamDeviceInfo.getName() );
    return ( false );
    catch ( NoPlayerException npex )
    statusBar.setText ("Cannot create player");
    return ( false );
    catch ( CannotRealizeException nre )
    statusBar.setText ( "Cannot realize player");
    return ( false );
    else
    return ( false );
    * Dynamically create menu items
    * @returns the device info object if found, null otherwise
    public void setFormat ( VideoFormat selectedFormat )
    if ( formatControl != null )
    player.stop();
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    player.start();
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    currentFormat = selectedFormat;
    visualContainer.setPreferredSize ( currentFormat.getSize() );
    setSize ( imageSize.width, imageSize.height + statusBar.getHeight() + toolbar.getHeight() );
    else
    System.out.println ("Visual component not an instance of FormatControl");
    statusBar.setText ( "Visual component cannot change format" );
    public VideoFormat getFormat ( )
    return ( currentFormat );
    protected void setUpToolBar ( )
    toolbar = new JToolBar();
    // Note : If you supply the 16 x 16 bitmaps then you can replace
    // the commented line in the MyToolBarAction constructor
    formatButton = new MyToolBarAction ( "Resolution", "BtnFormat.jpg" );
    captureButton = new MyToolBarAction ( "Capture", "BtnCapture.jpg" );
    toolbar.add ( formatButton );
    toolbar.add ( captureButton );
    getContentPane().add ( toolbar, BorderLayout.NORTH );
    protected void toolbarHandler ( MyToolBarAction actionBtn )
    if ( actionBtn == formatButton )
    Object selected = JOptionPane.showInputDialog (this,
    "Select Video format",
    "Capture format selection",
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