Omron V530-R150E-2 Operation Manual page 229

Appendix D
Glossary
Timing Pattern
These patterns are used to determine symbol density and horizontal and vertical
dimensions and thereby obtain a frame of reference for 2-dimensional codes. The
timing patterns 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 version number, the larger the number of cells per side.
Pattern Search
This is a method for locating finder patterns. Images of finder patterns are regis-
tered 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 pattern. 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
Resolution
The resolution is a measure of the detail with which images are displayed. The
V530-R150 can display images (via a monitor) using approximately 250,000 pixels
(512 484). This means that if the field of vision is 512 mm 484 mm, the resolution
will be 1 (mm/pixel).
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