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POWhen I try to capture a image from my webcam, its take a all black image
 

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  1. POWhen I try to capture a image from my webcam, its take a all black image
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    <p>I've downloaded a <a href="http://webcamapplet.sourceforge.net/" rel="nofollow">java project</a> in which interacts with my webcam. I'm trying to add the functionality to take pictures through the webcam, or just capture the current image and save it in my C: directory</p> <p>I created a button called Capture (startC) and did an ActionListener</p> <p><strong>ActionListener</strong></p> <pre><code>startC.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { // Grab a frame FrameGrabbingControl fgc = new FrameGrabbingControl() { @Override public Component getControlComponent() { // TODO Auto-generated method stub return null; } @Override public Buffer grabFrame() { // return null; return new Buffer(); } }; player.getControl("javax.media.control.FrameGrabbingControl"); buf = fgc.grabFrame(); // Convert it to an image BufferToImage btoi = new BufferToImage((VideoFormat)buf.getFormat()); // btoi = new BufferToImage((VideoFormat)buf.getFormat()); img = btoi.createImage(buf); // show the image //imgpanel.setImage(img); // save image try { saveJPG(img,"c:\\test.jpg"); } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } } }); </code></pre> <p><strong>UPDATED ActionListener</strong></p> <pre><code>startC.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { Vector devices = CaptureDeviceManager.getDeviceList(null); CaptureDeviceInfo cdi = null; for (Iterator i = devices.iterator(); i.hasNext();) { cdi = (CaptureDeviceInfo) i.next(); /* * Get the first Video For Windows (VFW) capture device. Use * the JMF registry tool in the bin directory of the JMF * distribution to detect available capture devices on your * computer. */ if (cdi.getName().startsWith("vfw:")) break; } try { player = Manager.createRealizedPlayer(cdi.getLocator()); player.start(); } catch (NoPlayerException e2) { e2.printStackTrace(); } catch (CannotRealizeException e3) { e3.printStackTrace(); } catch (IOException e4) { e4.printStackTrace(); } // start the Timer with 3s intervals new Timer(3000, this).start(); // Grab a frame from the capture device FrameGrabbingControl fgc = (FrameGrabbingControl) player.getControl("javax.media.control.FrameGrabbingControl"); buf = fgc.grabFrame(); BufferToImage btoi = new BufferToImage((VideoFormat) buf .getFormat()); img = btoi.createImage(buf); }); </code></pre> <p><strong>SaveJPG method</strong></p> <pre><code> public static void saveJPG(Image img, String s) throws IOException { BufferedImage bi = new BufferedImage(640, 480, BufferedImage.TYPE_INT_RGB); File outputfile = new File("C:\\saved.jpg"); ImageIO.write(bi, "png", outputfile); } </code></pre> <p>The problem is that when I click Capture, is simply saving a screen all black, and that's not what the webcam is focusing.</p> <p>Can someone help?</p> <p><strong>@UPDATE</strong></p> <p>Line 520 = <code>buf = fgc.grabFrame();</code></p> <pre><code>Exception in thread "AWT-EventQueue-1" java.lang.NullPointerException at com.colorfulwolf.webcamapplet.WebcamApplet$6.actionPerformed(WebcamApplet.java:520) at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.setPressed(Unknown Source) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source) at java.awt.Component.processMouseEvent(Unknown Source) at javax.swing.JComponent.processMouseEvent(Unknown Source) at java.awt.Component.processEvent(Unknown Source) at java.awt.Container.processEvent(Unknown Source) at java.awt.Component.dispatchEventImpl(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.EventQueue.dispatchEventImpl(Unknown Source) at java.awt.EventQueue.access$000(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source) </code></pre>
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      1. POWhen I try to capture a image from my webcam, its take a all black image
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    1. CO[SSCE](http://sscce.org)
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      1. POWhen I try to capture a image from my webcam, its take a all black image
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    2. CO@Keyser, My question is clear.
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    3. COYes, but that's not what the link is about.
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      1. POWhen I try to capture a image from my webcam, its take a all black image
      1. USkeyser
 

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