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POhow to scan till a valid qrcode is obtained continuously, decode it, put it to a JLabel, via a webcam
 

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  1. POhow to scan till a valid qrcode is obtained continuously, decode it, put it to a JLabel, via a webcam
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    <p>I wish to scan a QRCode via a webcam, decode it &amp; place it on a JLabel. The scanner should continuously scan till a valid QRCode is obtained. Im using eclipse, will someone point me to the correct direction?</p> <p>Websites tried:</p> <pre><code>- http://shashindrasri.blogspot.sg/2013_01_01_archive.html - http://webcam-capture.sarxos.pl/ - &amp; many more </code></pre> <p>I follow what was advised and the closest I can get is the following, which gives me errors like:</p> <pre><code>- java.lang.UnsupportedClassVersionError: com/google/zxing/NotFoundException : Unsupported major.minor version 51.0 - Could not find the main class: boundary.Scanner. Program will exit. - Exception in thread "Thread-3" java.lang.UnsatisfiedLinkError: C:\Users\Safety.Puss-HP\AppData\Local\Temp\javacpp403997126115\jniopencv_core.dll: Can't find dependent libraries </code></pre> <p>Imports I did:</p> <pre><code>- webcam-capture-0.3.10-RC4 - slf4j-api-1.7.2 - bridj-0.7-20130703.103049-42 </code></pre> <p>The code:</p> <pre><code>import java.awt.Dimension; import java.awt.FlowLayout; import java.awt.image.BufferedImage; import java.util.concurrent.Executor; import java.util.concurrent.Executors; import java.util.concurrent.ThreadFactory; import javax.swing.JFrame; import javax.swing.JTextArea; import com.github.sarxos.webcam.Webcam; import com.github.sarxos.webcam.WebcamPanel; import com.github.sarxos.webcam.WebcamResolution; import com.google.zxing.BinaryBitmap; import com.google.zxing.LuminanceSource; import com.google.zxing.MultiFormatReader; import com.google.zxing.NotFoundException; import com.google.zxing.Result; import com.google.zxing.client.j2se.BufferedImageLuminanceSource; import com.google.zxing.common.HybridBinarizer; public class Scanner extends JFrame implements Runnable, ThreadFactory { private static final long serialVersionUID = 6441489157408381878L; private Executor executor = Executors.newSingleThreadExecutor(this); private Webcam webcam = null; private WebcamPanel panel = null; private JTextArea textarea = null; public Scanner() { super(); setLayout(new FlowLayout()); setTitle("Read QR / Bar Code With Webcam"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Dimension size = WebcamResolution.QVGA.getSize(); webcam = Webcam.getWebcams().get(0); webcam.setViewSize(size); panel = new WebcamPanel(webcam); panel.setPreferredSize(size); textarea = new JTextArea(); textarea.setEditable(false); textarea.setPreferredSize(size); add(panel); add(textarea); pack(); setVisible(true); executor.execute(this); } @Override public void run() { do { try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } Result result = null; BufferedImage image = null; if (webcam.isOpen()) { if ((image = webcam.getImage()) == null) { continue; } LuminanceSource source = new BufferedImageLuminanceSource(image); BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source)); try { result = new MultiFormatReader().decode(bitmap); } catch (NotFoundException e) { // fall thru, it means there is no QR code in image } } if (result != null) { textarea.setText(result.getText()); } } while (true); } @Override public Thread newThread(Runnable r) { Thread t = new Thread(r, "example-runner"); t.setDaemon(true); return t; } public static void main(String[] args) { new Scanner(); } } </code></pre>
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