Example Webcam Capture - Revision history

Peter at 12:53, 28 March 2016

2016-03-28T12:53:52Z

← Older revision		Revision as of 12:53, 28 March 2016
Line 1:		Line 1:
	Demonstration of how to stream images from [http://webcam-capture.sarxos.pl/ Webcam Capture] and process them in BoofCV. Webcam Capture is an easy to use library for accessing webcams in Java. In the example below the default webcam is streamed and KLT features are tracked. More examples can be found in the webcam capture [https://github.com/lessthanoptimal/BoofCV/blob/~~master~~/integration/WebcamCapture/examples/boofcv/examples/ examples directory]		Demonstration of how to stream images from [http://webcam-capture.sarxos.pl/ Webcam Capture] and process them in BoofCV. Webcam Capture is an easy to use library for accessing webcams in Java. In the example below the default webcam is streamed and KLT features are tracked. More examples can be found in the webcam capture [https://github.com/lessthanoptimal/BoofCV/blob/v0.23/integration/WebcamCapture/examples/boofcv/examples/ examples directory]

	Example Code:		Example Code:
	* [https://github.com/lessthanoptimal/BoofCV/blob/v0.19/integration/WebcamCapture/examples/boofcv/examples/ExampleTrackingKlt.java ExampleTrackingKlt.java]		* [https://github.com/lessthanoptimal/BoofCV/blob/v0.23/integration/WebcamCapture/examples/boofcv/examples/ExampleTrackingKlt.java ExampleTrackingKlt.java]

	Concepts:		Concepts:
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	PkltConfig configKlt = new PkltConfig(3,new int[]{1,2,4,8});		PkltConfig configKlt = new PkltConfig(3,new int[]{1,2,4,8});

	PointTracker<~~ImageFloat32~~> tracker = FactoryPointTracker.klt(configKlt,configDetector,~~ImageFloat32~~.class,null);		PointTracker<GrayF32> tracker = FactoryPointTracker.klt(configKlt,configDetector,GrayF32.class,null);

	// Open a webcam at a resolution close to 640x480		// Open a webcam at a resolution close to 640x480
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	while( true ) {		while( true ) {
	BufferedImage image = webcam.getImage();		BufferedImage image = webcam.getImage();
	~~ImageFloat32~~ gray = ConvertBufferedImage.convertFrom(image,(~~ImageFloat32~~)null);		GrayF32 gray = ConvertBufferedImage.convertFrom(image,(GrayF32)null);

	tracker.process(gray);		tracker.process(gray);

Peter at 04:45, 20 September 2015

2015-09-20T04:45:22Z

← Older revision		Revision as of 04:45, 20 September 2015
Line 2:		Line 2:

	Example Code:		Example Code:
	* [https://github.com/lessthanoptimal/BoofCV/blob/~~master~~/integration/WebcamCapture/examples/boofcv/examples/ExampleTrackingKlt.java ExampleTrackingKlt.java]		* [https://github.com/lessthanoptimal/BoofCV/blob/v0.19/integration/WebcamCapture/examples/boofcv/examples/ExampleTrackingKlt.java ExampleTrackingKlt.java]

	Concepts:		Concepts:
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	Webcam webcam = UtilWebcamCapture.openDefault(640,480);		Webcam webcam = UtilWebcamCapture.openDefault(640,480);

	// Create the panel used to display the image and		// Create the panel used to display the image and feature tracks
	ImagePanel gui = new ImagePanel();		ImagePanel gui = new ImagePanel();
	gui.setPreferredSize(webcam.getViewSize());		gui.setPreferredSize(webcam.getViewSize());

	ShowImages.showWindow(gui,"KLT Tracker");		ShowImages.showWindow(gui,"KLT Tracker",true);

	int minimumTracks = 100;		int minimumTracks = 100;

Peter: Created page with "Demonstration of how to stream images from [http://webcam-capture.sarxos.pl/ Webcam Capture] and process them in BoofCV. Webcam Capture is an easy to use library for accessing..."

2014-06-19T21:24:10Z

Created page with "Demonstration of how to stream images from [http://webcam-capture.sarxos.pl/ Webcam Capture] and process them in BoofCV. Webcam Capture is an easy to use library for accessing..."

New page

Demonstration of how to stream images from [http://webcam-capture.sarxos.pl/ Webcam Capture] and process them in BoofCV. Webcam Capture is an easy to use library for accessing webcams in Java. In the example below the default webcam is streamed and KLT features are tracked. More examples can be found in the webcam capture [https://github.com/lessthanoptimal/BoofCV/blob/master/integration/WebcamCapture/examples/boofcv/examples/ examples directory]

Example Code:
* [https://github.com/lessthanoptimal/BoofCV/blob/master/integration/WebcamCapture/examples/boofcv/examples/ExampleTrackingKlt.java ExampleTrackingKlt.java]

Concepts:
* Webcams

= Example Code =

<syntaxhighlight lang="java">
/**
* Processes a video feed and tracks points using KLT
*
* @author Peter Abeles
*/
public class ExampleTrackingKlt {

public static void main(String[] args) {

// tune the tracker for the image size and visual appearance
ConfigGeneralDetector configDetector = new ConfigGeneralDetector(-1,8,1);
PkltConfig configKlt = new PkltConfig(3,new int[]{1,2,4,8});

PointTracker<ImageFloat32> tracker = FactoryPointTracker.klt(configKlt,configDetector,ImageFloat32.class,null);

// Open a webcam at a resolution close to 640x480
Webcam webcam = UtilWebcamCapture.openDefault(640,480);

// Create the panel used to display the image and
ImagePanel gui = new ImagePanel();
gui.setPreferredSize(webcam.getViewSize());

ShowImages.showWindow(gui,"KLT Tracker");

int minimumTracks = 100;
while( true ) {
BufferedImage image = webcam.getImage();
ImageFloat32 gray = ConvertBufferedImage.convertFrom(image,(ImageFloat32)null);

tracker.process(gray);

List<PointTrack> tracks = tracker.getActiveTracks(null);

// Spawn tracks if there are too few
if( tracks.size() < minimumTracks ) {
tracker.spawnTracks();
tracks = tracker.getActiveTracks(null);
minimumTracks = tracks.size()/2;
}

// Draw the tracks
Graphics2D g2 = image.createGraphics();

for( PointTrack t : tracks ) {
VisualizeFeatures.drawPoint(g2,(int)t.x,(int)t.y,Color.RED);
}

gui.setBufferedImageSafe(image);
}
}
}
</syntaxhighlight>