Hand Held Products IT4800 - Manual (Page 22)

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Encoded Message
The encoded message is the information (alpha, numeric, and/or control char-
acters) or message contained within the bar code symbol and output as part of
the decoding process. This information precedes the calculated PQA parame-
ters. This information must be manually compared to the characters that should
be encoded.
Error Correction/Error Correction Characters
Error Correction is a reader/decoder’s use of mathematical processes to recon-
struct or replace damaged or missing symbol characters. Error correction char-
acters are specific symbol characters that are created automatically from the
other symbol data characters and used for error correction and detection.
Error Correction Level (ECL)
Error Correction Level is an indication of the number of characters used in a
symbology for the purpose of error correction. Higher levels of error correction
allow for correcting greater potential symbol damage.
Error Detection/Error Detection Characters
Error Detection is the use of error correction characters (symbol characters that
are reserved for error detection and calculated automatically from the other
symbol characters) to detect whether the presence of errors in the symbol
exceeds the error correction capacity. Error detection will keep the symbol from
being decoded as erroneous data.
Mask Pattern/Masking
Mask Pattern/Masking is a specific part or characteristic of QR Code where a
process is used to provide a more evenly balanced number of light and dark
modules to reduce the occurrence of arrangements of adjoining modules that
might interfere with efficient processing of a symbol's image. For additional
information, refer to the QR Code symbology, available from AIM Global Speci-
fication (www.aimglobal.org).