code: public BitArray getBlackRow(int y, BitArray row) throws NotFoundException {
      return binarizer.getBlackRow(y, row);
    }
docs: Converts one row of luminance data to 1 bit data. May actually do the conversion, or return
  cached data. Callers should assume this method is expensive and call it as seldom as possible.
  This method is intended for decoding 1D barcodes and may choose to apply sharpening.
  
  @param y The row to fetch, which must be in [0, bitmap height)
  @param row An optional preallocated array. If null or too small, it will be ignored.
  If used, the Binarizer will call BitArray.clear(). Always use the returned object.
  @return The array of bits for this row (true means black).
  @throws NotFoundException if row can't be binarized