Security level

One of PDF417’s most valuable features is its ability to allow correction of errors. This ability is provided by the inclusion of additional codewords within the symbol, so that the data codewords may be reconstructed even if some are defaced or misread.

The number of damaged codewords (Nmax) which may be recovered depends on the security level (which in turn determines the number of additional characters included in the symbol)

 

 

Security level	Nmax
0	0
1	2
2	6
3	14
4	30
5	62
6	126
7	154
8	510

 

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Aspect ratio