Class Decoder

java.lang.Object
com.google.zxing.datamatrix.decoder.Decoder

public final class Decoder extends Object

The main class which implements Data Matrix Code decoding -- as opposed to locating and extracting the Data Matrix Code from an image.

  • Field Details

  • Constructor Details

    • Decoder

      public Decoder()
  • Method Details

    • decode

      public DecoderResult decode(boolean[][] image) throws FormatException, ChecksumException

      Convenience method that can decode a Data Matrix Code represented as a 2D array of booleans. "true" is taken to mean a black module.

      Parameters:
      image - booleans representing white/black Data Matrix Code modules
      Returns:
      text and bytes encoded within the Data Matrix Code
      Throws:
      FormatException - if the Data Matrix Code cannot be decoded
      ChecksumException - if error correction fails
    • decode

      Decodes a Data Matrix Code represented as a BitMatrix. A 1 or "true" is taken to mean a black module.

      Parameters:
      bits - booleans representing white/black Data Matrix Code modules
      Returns:
      text and bytes encoded within the Data Matrix Code
      Throws:
      FormatException - if the Data Matrix Code cannot be decoded
      ChecksumException - if error correction fails
    • correctErrors

      private int correctErrors(byte[] codewordBytes, int numDataCodewords) throws ChecksumException

      Given data and error-correction codewords received, possibly corrupted by errors, attempts to correct the errors in-place using Reed-Solomon error correction.

      Parameters:
      codewordBytes - data and error correction codewords
      numDataCodewords - number of codewords that are data bytes
      Returns:
      the number of errors corrected
      Throws:
      ChecksumException - if error correction fails