: Class FrameGrabber

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mit.ai.vision.framegrabber
Class FrameGrabber

java.lang.Object
  |
  +--mit.ai.vision.framegrabber.FrameGrabber

public class FrameGrabber
extends java.lang.Object
implements java.lang.Runnable

Field Summary
`static int`	`FRAME_COLUMNS` The number of columns in the frames.
`static int`	`FRAME_ROWS` The number of rows in the frames.

Constructor Summary
`FrameGrabber()` This is the FrameGrabber constructor.

Method Summary
`void`	`addFrameListener(FrameListener fl_object)` This method adds a new FrameListener to this FrameGrabber.
`void`	`endGrabbing()` This exits the grabbing process and cleans up the native thread that controls it.
`protected void`	`finalize()` Calls endGrabbing () to kill the grabbing thread cleanly.
`void`	`freezeFrame()` This stops the grabbing until unfreezeFrame () is called.
`void`	`run()` This should never be called directly by the user.
`void`	`startGrabbing()` Creates the native thread that communicates with the frame server.
`void`	`unfreezeFrame()` This restarts the grabbing thread after a freezeFrame () call.

Methods inherited from class java.lang.Object

clone, 
equals, 
getClass, 
hashCode, 
notify, 
notifyAll, 
toString, 
wait, 
wait, 
wait

Field Detail

FRAME_ROWS

public static final int FRAME_ROWS

The number of rows in the frames.

FRAME_COLUMNS

public static final int FRAME_COLUMNS

The number of columns in the frames.

Constructor Detail

FrameGrabber

public FrameGrabber()

This is the FrameGrabber constructor. Currently, all options, such as the frame dimensions, are hard-coded in. The constructor does not start the thread responsible for accepting the frames, you must call startGrabbing () for that.

Method Detail

startGrabbing

public void startGrabbing()

Creates the native thread that communicates with the frame server. The thread created is a daemon thread, so it will cease executing if it is the only thread remaining in the JVM. The priority of the thread is set to be 3 levels below the parent thread - this was found to be necessary to prevent it from overwhelming the scheduling of AWT threads. In a future version, the priority may be user specifiable.

freezeFrame

public void freezeFrame()

This stops the grabbing until unfreezeFrame () is called.

unfreezeFrame

public void unfreezeFrame()

This restarts the grabbing thread after a freezeFrame () call.

endGrabbing

public void endGrabbing()

This exits the grabbing process and cleans up the native thread that controls it.

run

public void run()

This should never be called directly by the user. It is only public to satisfy the requirements of the Runnable interface.

Specified by:: run in interface java.lang.Runnable

addFrameListener

public void addFrameListener(FrameListener fl_object)

This method adds a new FrameListener to this FrameGrabber.

finalize

protected void finalize()
                 throws java.lang.Throwable

Calls endGrabbing () to kill the grabbing thread cleanly.

Overrides:: finalize in class java.lang.Object