itMatrix</a>&nbsp;getBlackMatrix()
                         throws <a href="../../../com/google/zxing/NotFoundException.html" title="class in com.google.zxing">NotFoundException</a></pre>
<div class="block">Converts a 2D array of luminance data to 1 bit. As above, assume this method is expensive
 and do not call it repeatedly. This method is intended for decoding 2D barcodes and may or
 may not apply sharpening. Therefore, a row from this matrix may not be identical to one
 fetched using getBlackRow(), so d