Example Detect QR Code - Revision history

Peter at 16:50, 10 November 2022

2022-11-10T16:50:08Z

← Older revision		Revision as of 16:50, 10 November 2022
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	Relevant Examples/Tutorials:		Relevant Examples/Tutorials:
			* [https://www.ninox360.com/barcode-scanner 2D Barcode Webapp]
	* [[Tutorial_QRCodes\|Tutorial QR Codes]]		* [[Tutorial_QRCodes\|Tutorial QR Codes]]
	* [[Example_Render_QR_Code\|Rendering QR Codes]]		* [[Example_Render_QR_Code\|Rendering QR Codes]]

Peter at 05:52, 15 February 2022

2022-02-15T05:52:15Z

← Older revision		Revision as of 05:52, 15 February 2022
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	* [[Tutorial_QRCodes\|Tutorial QR Codes]]		* [[Tutorial_QRCodes\|Tutorial QR Codes]]
	* [[Example_Render_QR_Code\|Rendering QR Codes]]		* [[Example_Render_QR_Code\|Rendering QR Codes]]
	* [[Performance:QrCode\|Performance Study]]		* [[Performance:QrCode\|QR Code Performance Study]]
			* [[Example_Detect_Micro_QR_Code\|Micro QR Code]]

	= Example Code =		= Example Code =

Peter at 22:38, 17 January 2022

2022-01-17T22:38:12Z

← Older revision		Revision as of 22:38, 17 January 2022
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	Example Code:		Example Code:
	* [https://github.com/lessthanoptimal/BoofCV/blob/v0.38/examples/src/main/java/boofcv/examples/fiducial/ExampleDetectQrCode.java ExampleDetectQrCode.java]		* [https://github.com/lessthanoptimal/BoofCV/blob/v0.40/examples/src/main/java/boofcv/examples/fiducial/ExampleDetectQrCode.java ExampleDetectQrCode.java]

	Concepts:		Concepts:
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	public class ExampleDetectQrCode {		public class ExampleDetectQrCode {
	public static void main( String[] args ) {		public static void main( String[] args ) {
	BufferedImage input = UtilImageIO.~~loadImage~~(UtilIO.pathExample("fiducial/qrcode/image01.jpg"));		BufferedImage input = UtilImageIO.loadImageNotNull(UtilIO.pathExample("fiducial/qrcode/image01.jpg"));
	GrayU8 gray = ConvertBufferedImage.convertFrom(input, (GrayU8)null);		GrayU8 gray = ConvertBufferedImage.convertFrom(input, (GrayU8)null);

	QrCodeDetector<GrayU8> detector = FactoryFiducial.qrcode(~~null~~, GrayU8.class);		var config = new ConfigQrCode();
			// config.considerTransposed = false; // by default, it will consider incorrectly encoded markers. Faster if false
			QrCodeDetector<GrayU8> detector = FactoryFiducial.qrcode(config, GrayU8.class);

	detector.process(gray);		detector.process(gray);

	// ~~Get's~~ a list of all the qr codes it could successfully detect and decode		// Gets a list of all the qr codes it could successfully detect and decode
	List<QrCode> detections = detector.getDetections();		List<QrCode> detections = detector.getDetections();

	Graphics2D g2 = input.createGraphics();		Graphics2D g2 = input.createGraphics();
	int strokeWidth = Math.max(4, input.getWidth()/200); // in large images the line can be too thin		int strokeWidth = Math.max(4, input.getWidth()/200); // in large images the line can be too thin
	g2.setColor(Color.GREEN); g2.setStroke(new BasicStroke(strokeWidth));		g2.setColor(Color.GREEN);
			g2.setStroke(new BasicStroke(strokeWidth));
	for (QrCode qr : detections) {		for (QrCode qr : detections) {
	// The message encoded in the marker		// The message encoded in the marker
	System.out.println("message: " + qr.message);		System.out.println("message: '" + qr.message + "'");

	// Visualize its location in the image		// Visualize its location in the image
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	g2.setColor(Color.RED);		g2.setColor(Color.RED);
	for (QrCode qr : failures) {		for (QrCode qr : failures) {
	// If the 'cause' is ERROR_CORRECTION or ~~later~~ then it's ~~probably~~ a real ~~QR Code that~~		// If the 'cause' is ERROR_CORRECTION or higher, then there's a decent chance it's a real marker
	if (qr.failureCause.ordinal() < QrCode.Failure.ERROR_CORRECTION.ordinal())		if (qr.failureCause.ordinal() < QrCode.Failure.ERROR_CORRECTION.ordinal())
	continue;		continue;

Peter at 18:02, 12 July 2021

2021-07-12T18:02:46Z

← Older revision		Revision as of 18:02, 12 July 2021
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	Example Code:		Example Code:
	* [https://github.com/lessthanoptimal/BoofCV/blob/v0.37/examples/src/main/java/boofcv/examples/fiducial/ExampleDetectQrCode.java ExampleDetectQrCode.java]		* [https://github.com/lessthanoptimal/BoofCV/blob/v0.38/examples/src/main/java/boofcv/examples/fiducial/ExampleDetectQrCode.java ExampleDetectQrCode.java]

	Concepts:		Concepts:

Peter at 01:59, 22 December 2020

2020-12-22T01:59:59Z

← Older revision		Revision as of 01:59, 22 December 2020
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	Example Code:		Example Code:
	* [https://github.com/lessthanoptimal/BoofCV/blob/v0.28/examples/src/main/java/boofcv/examples/fiducial/ExampleDetectQrCode.java ExampleDetectQrCode.java]		* [https://github.com/lessthanoptimal/BoofCV/blob/v0.37/examples/src/main/java/boofcv/examples/fiducial/ExampleDetectQrCode.java ExampleDetectQrCode.java]

	Concepts:		Concepts:
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	*/		*/
	public class ExampleDetectQrCode {		public class ExampleDetectQrCode {
	public static void main(String[] args) {		public static void main( String[] args ) {
	BufferedImage input = UtilImageIO.loadImage(UtilIO.pathExample("fiducial/qrcode/image01.jpg"));		BufferedImage input = UtilImageIO.loadImage(UtilIO.pathExample("fiducial/qrcode/image01.jpg"));
	GrayU8 gray = ConvertBufferedImage.convertFrom(input,(GrayU8)null);		GrayU8 gray = ConvertBufferedImage.convertFrom(input, (GrayU8)null);

	QrCodeDetector<GrayU8> detector = FactoryFiducial.qrcode(null,GrayU8.class);		QrCodeDetector<GrayU8> detector = FactoryFiducial.qrcode(null, GrayU8.class);

	detector.process(gray);		detector.process(gray);
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	Graphics2D g2 = input.createGraphics();		Graphics2D g2 = input.createGraphics();
	int strokeWidth = Math.max(4,input.getWidth()/200); // in large images the line can be too thin		int strokeWidth = Math.max(4, input.getWidth()/200); // in large images the line can be too thin
	g2.setColor(Color.GREEN);g2.setStroke(new BasicStroke(strokeWidth));		g2.setColor(Color.GREEN); g2.setStroke(new BasicStroke(strokeWidth));
	for( QrCode qr : detections ) {		for (QrCode qr : detections) {
	// The message encoded in the marker		// The message encoded in the marker
	System.out.println("message: "+qr.message);		System.out.println("message: " + qr.message);

	// Visualize its location in the image		// Visualize its location in the image
	VisualizeShapes.drawPolygon(qr.bounds,true,1,g2);		VisualizeShapes.drawPolygon(qr.bounds, true, 1, g2);
	}		}

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	List<QrCode> failures = detector.getFailures();		List<QrCode> failures = detector.getFailures();
	g2.setColor(Color.RED);		g2.setColor(Color.RED);
	for( QrCode qr : failures ) {		for (QrCode qr : failures) {
	// If the 'cause' is ERROR_CORRECTION or later then it's probably a real QR Code that		// If the 'cause' is ERROR_CORRECTION or later then it's probably a real QR Code that
	if( qr.failureCause.ordinal() < QrCode.Failure.ERROR_CORRECTION.ordinal() )		if (qr.failureCause.ordinal() < QrCode.Failure.ERROR_CORRECTION.ordinal())
	continue;		continue;

	VisualizeShapes.drawPolygon(qr.bounds,true,1,g2);		VisualizeShapes.drawPolygon(qr.bounds, true, 1, g2);
	}		}

	ShowImages.showWindow(input,"Example QR Codes", true);		ShowImages.showWindow(input, "Example QR Codes", true);
	}		}
	}		}
	</syntaxhighlight>		</syntaxhighlight>

Peter at 06:17, 8 October 2018

2018-10-08T06:17:03Z

← Older revision		Revision as of 06:17, 8 October 2018
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	* [[Tutorial_QRCodes\|Tutorial QR Codes]]		* [[Tutorial_QRCodes\|Tutorial QR Codes]]
	* [[Example_Render_QR_Code\|Rendering QR Codes]]		* [[Example_Render_QR_Code\|Rendering QR Codes]]
	* [[Performance ~~Study~~\|Performance~~:QrCode~~]]		* [[Performance:QrCode\|Performance Study]]

	= Example Code =		= Example Code =

Peter at 06:16, 8 October 2018

2018-10-08T06:16:47Z

← Older revision		Revision as of 06:16, 8 October 2018
Line 20:		Line 20:
	* [[Tutorial_QRCodes\|Tutorial QR Codes]]		* [[Tutorial_QRCodes\|Tutorial QR Codes]]
	* [[Example_Render_QR_Code\|Rendering QR Codes]]		* [[Example_Render_QR_Code\|Rendering QR Codes]]
			* [[Performance Study\|Performance:QrCode]]

	= Example Code =		= Example Code =

Peter at 00:09, 21 January 2018

2018-01-21T00:09:42Z

← Older revision		Revision as of 00:09, 21 January 2018
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	Relevant Examples/Tutorials:		Relevant Examples/Tutorials:
	* [[~~Tutorial_Fiducials~~\|Tutorial ~~Fiducials~~]]		* [[Tutorial_QRCodes\|Tutorial QR Codes]]
	* [[Example_Render_QR_Code\|Rendering QR Codes]]		* [[Example_Render_QR_Code\|Rendering QR Codes]]

Peter at 00:08, 21 January 2018

2018-01-21T00:08:00Z

← Older revision		Revision as of 00:08, 21 January 2018
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	* Fiducials		* Fiducials
	* QR Codes		* QR Codes

			Relevant Videos:
			* [https://youtu.be/TGg-xgTyaU8?t=272 Youtube Demo]

	Relevant Examples/Tutorials:		Relevant Examples/Tutorials:

Peter at 06:04, 20 January 2018

2018-01-20T06:04:50Z

← Older revision		Revision as of 06:04, 20 January 2018
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	Relevant Examples/Tutorials:		Relevant Examples/Tutorials:
	* [[Tutorial_Fiducials\|Tutorial Fiducials]]		* [[Tutorial_Fiducials\|Tutorial Fiducials]]
			* [[Example_Render_QR_Code\|Rendering QR Codes]]

← Older revision		Revision as of 05:52, 15 February 2022
Line 20:		Line 20:
	* [[Tutorial_QRCodes\|Tutorial QR Codes]]		* [[Tutorial_QRCodes\|Tutorial QR Codes]]
	* [[Example_Render_QR_Code\|Rendering QR Codes]]		* [[Example_Render_QR_Code\|Rendering QR Codes]]
	* [[Performance:QrCode\|Performance Study]]		* [[Performance:QrCode\|QR Code Performance Study]]
			* [[Example_Detect_Micro_QR_Code\|Micro QR Code]]

	= Example Code =		= Example Code =