Omron V530-R150E-2 Operation Manual page 227

Appendix D
Glossary
This glossary focuses on terms related to QR Codes and Data Matrix codes which
are matrix-type 2-dimensional codes. There may be some parts of this glossary that
do not apply to other types of 2-dimensional codes.
Data Matrix
Data Matrix codes were developed by I.D. Matrix, and are used extensively in the
semiconductor and electronics industries. Data Matrix codes have a relatively large
data capacity for their size. There are several different types of Data Matrix, differ-
entiated by their error correction method. The ECC200 is the most commonly used
type.
QR Code
The "Quick Response Code" type is a 2-dimensional code that was developed in
Japan. High-speed reading is possible with QR Codes, but the code size is quite
large compared to other 2-dimensional codes.
Error Correction
This term is used to describe the function which detects and corrects errors using a
special mathematical technique (commonly known as the "Reed-Solomon"
method). Using this function, reading is possible, to a certain extent, for codes with
poor printing quality or that are damaged. There are, however, limits on the extent to
which correction is possible, and reading may not be possible for codes if the dam-
age is extensive. There are 2-dimensional codes for which the error correction level
can be selected. (For example, with QR Codes, error correction levels of 7%, 15%,
25%, or 30% are available.)
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