title: Use ZXing camera decoding confusion
body: <p>I check the Internet and see using ZXing to solve two-dimension code. But the code I do not understand.</p>
  
  <pre><code>PlanarYUVLuminanceSource source = new PlanarYUVLuminanceSource( data, width, height, dstLeft, dstTop, dstWidth,dstHeight, false);
  </code></pre>
  
  <p>What the meaning of the parameter? </p>