title: Curious Scan Behaviour (Zxing)
body: <p>I currently try to detect QR-Codes inside an large (vertical large) image. </p>
  
  <p>When I pass the large image into the ZXing .decode() I get a NotFoundException. 
  I read somewhere that an image can only have a certain size/height and so I wrote a kind of "walker" that divides the image and then searches and decodes the QR code.</p>
  
  <p>The system works quite well but Zxing doesn't play along.</p>
  
  <p>During my tests with the system I produced three images and one of them is working to extract the qr code. </p>
  
  <p>Image 1 (NotWorking => NotFoundException):</p>
  
  <p><strong>Resolution</strong>: 999x648.<br>
  <strong>Size</strong>: 329.09 kB
  <a href="https://i.stack.imgur.com/vBBEl.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/vBBEl.png" alt="enter image description here"></a></p>
  
  <p>Image 2 (Working => Correct Output): </p>
  
  <p><strong>Resolution</strong>: 999x714
  <strong>Size</strong>: 357.41 kB
  <a href="https://i.stack.imgur.com/PQOjh.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/PQOjh.png" alt="enter image description here"></a></p>
  
  <p>Image 3 (Not Working => NotFoundException)</p>
  
  <p><strong>Resolution</strong>: 999x800
  <strong>Size</strong>: 391.86 kB</p>
  
  <p><a href="https://i.stack.imgur.com/0b7QX.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0b7QX.png" alt="enter image description here"></a></p>
  
  <p>The Code for decoding is as simple as the images. </p>
  
  <pre><code>BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(
  new BufferedImageLuminanceSource(bufferedImageWalker)));
  qrCodeResult = multiFormatReader.decode(binaryBitmap);
  </code></pre>
  
  <p>When I change the MultiFormatReader to a QRCodeReader, I get a</p>
  
  <pre><code>com.google.zxing.ChecksumException
  </code></pre>