Omron V530-C300E Operation Manual page 199

Appendix D
Glossary
Cell
These squares are the units that make up matrix-type 2-dimensional codes. Whether
these cells are black or white determines the information carried by the code.
Timing Pattern
These patterns are used to determine symbol density and horizontal and vertical dimen-
sions and thereby obtain a frame of reference for 2-dimensional codes. The timing pat-
terns are straight lines composed of alternating black and white cells.
QR Code
Data Matrix
Timing pattern
Version (QR Code)
The code size of QR Codes is indicated by the version. "Version 1" indicates that a QR
Code contains (the minimum) 21 cells both horizontally and vertically. The larger the ver-
sion number, the larger the number of cells per side.
Pattern Search
This is a method for locating finder patterns. Images of finder patterns are registered as
models in advance and searches are made for similar parts of input images. The degree
of similarity is expressed as a correlation value (0 to 100). The more similar the pattern,
the higher the correlation value. The place with the highest correlation value out of
places with a correlation value over a set threshold value is deemed to be the finder pat-
tern. If it is not possible to detect a finder pattern, decrease this threshold value. If too
many finder patterns are detected, increase this threshold value.
Finder Pattern
These are patterns used to detect the position of 2-dimensional codes. The shape of the
finder patterns varies with the type of code.
QR Code
Data Matrix
Finder pattern
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