Abstract: The principle of RS error correction code and its application in two-dimensional bar code PDF417 was introduced, and a method of encoding and decoding in GF(929) was discussed in detail with an example.Meanwhile,an error correction coding and decoding table-checking method suitable to PDF417 was proposed,which could decide any code corresponding to the power of the element in GF(929).Using this method,the rapid and efficient computation for the coefficients of the generating polynomial and syndrome polynomials can be conducted.

Key words: RS code, PDF417, Galois region, encode, decode