title: Zxing NotFoundException
body: <p>I try to use Zxing to decode Aztec code.</p>
  
  <p>I use code from <a href="https://stackoverflow.com/questions/18863466/reading-qrcode-with-zxing-in-java/20142396#20142396">SO answer</a>. 
  Here is a part of it:</p>
  
  <pre><code>public static String readQRCode(String filePath, String charset, Map hintMap)
          throws FileNotFoundException, IOException, NotFoundException {
      BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(
              new BufferedImageLuminanceSource(
                      ImageIO.read(new FileInputStream(filePath)))));
      Result qrCodeResult = new MultiFormatReader().decode(binaryBitmap,
              hintMap);
      return qrCodeResult.getText();
  }
  </code></pre>
  
  <p>I try to read those image by code above:</p>
  
  <p><a href="https://i.stack.imgur.com/dfSQK.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dfSQK.jpg" alt="enter image description here"></a></p>
  
  <p>But this fails with:</p>
  
  <pre><code>Exception in thread "main" com.google.zxing.NotFoundException
  </code></pre>
  
  <p>I said - Ok, maybe it's too low quality - so I took GIMP and:</p>
  
  <ol>
  <li>Erode image with 3x3 mask.</li>
  <li>Take automatic gimp thresholding (binarize image). </li>
  </ol>
  
  <p>That simple pre-processing gave me this:</p>
  
  <p><a href="https://i.stack.imgur.com/gma7d.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/gma7d.jpg" alt="enter image description here"></a></p>
  
  <p>Maybe it hasn't wonderful quality, but it is simply black and white - is it better? No. I still obtain:</p>
  
  <pre><code>Exception in thread "main" com.google.zxing.NotFoundException
  </code></pre>
  
  <p>What is strange: almost all Barcode Readers reads both without any problems. For example: NeoReader (Android - mobile phone) reads both from laptop's screen - correctly!</p>
  
  <p>I want to add that absolutely clear images like <a href="https://pl.wikipedia.org/wiki/Aztec_Code#/media/File:Aztec_wikipedia.png" rel="nofollow noreferrer">this from Wiki</a>, are correctly recognized by this code.</p>
  
  <p><strong>Question:</strong></p>
  
  <p>What is wrong with the code above?</p>
  
  <p>How decode this Aztec codes? I can do any preprocessing, but what steps are require? </p>
  
  <p>Please help.</p>
  
  <p><em>Project details: Java 8, com.google.zxing:core:3.2.1, com.google.zxing:javase:3.2.1</em></p>