Raspberry Pi B+ capture a image from a video cam

Hello,
is there any way to capture a image from the video camera. I didn't find any media class for video. Nor did I find any Runtime.exec to use a native linux command.
Did I overseen something?

Hi Klaus,
There a few ideas in design stage, but nothing solid enough to talk about. And actually it should not have been possible with older ME as it's specifically prohibited by the spec. I mean native methods in Java applications. Of course there may be other means to communicate with native applications, like files, sockets etc. But no direct calls
The date for ME 8.1 GA (General Availability) release is not confirmed yet. But it should happen quite soon, stay tuned
Regards.
Andrey

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How to capture an image from my usb camera and display on my front panel

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Thanks a lot. But when I view the program in the thread, it seems that it needs to some program code is to play the video first and then the image can be captured. Is it possible that even I don't write the code for playing the video first and just write the captured code so that can still capture the image by using Java only from the exists video file. Thanks a lot.

Thanks a lot. But when I view the program in the thread, it seems that it needs to some program code is to play the video first and then the image can be captured. Is it possible that even I don't write the code for playing the video first and just write the captured code so that can still capture the image by using Java only from the exists video file. Thanks a lot.You can get away without playing the video by seeking to the frame you want using FramePositioningControl ( [example here|http://java.sun.com/javase/technologies/desktop/media/jmf/2.1.1/solutions/Seek.html] )and then capturing the frame using FrameGrabbingControl (similar to the code I posted). But still you would have to load the video file, create the player using url, realize the player, perhaps prefetch it (all in the link I have given above) then you are ready to seek to particular frame and capture it. But now you don't need to actually start the player so that video/audio is visible/audible.
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Cheers Tom, I think you just saved me a small fortune..
Here's the camera: http://reviews.cnet.co.uk/camcorders/0,39029967,49263047,00.htm
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Hello All,
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<[email protected]> wrote in message news:[email protected].. > Thats interesting. I had talked to a representative from Adobe and I was > told it would be crystal clear of a photograph! That includes after the > image being deinterlaced... It will be "clear." However, the clarity of a picture is a function of the original video and the resolution. Standard definition digital video is 720 x 480 pixels for a total of 345,600 or, roughly, 1/3 of a megabyte. This is very low resolution compared to what a good digital still camera can produce, i.e. 4-8 megabytes. A high-definition frame will contain 1,920 x 1,080 pixels, totaling 2,073,600. A 2 megabyte frame will produce a reasonable 4 x 6 photograph.

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

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