Omron V530-R160E User Manual page 287

Glossary
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 high-
est 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
(Starting symbols) of the finder patterns varies with the type of code.
Resolution The resolution is a measure of the detail with which images are displayed. The
V530-R160 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 resolu-
tion will be 1 (mm/pixel).
Marking methods There are several marking methods that can be used. The most suitable method
will depend on factors such as the material of the object onto which the code is
marked.
The most commonly used marking devices are listed below.
Margin This is the empty space around 2-dimensional codes. The OMRON V530-R160
can read codes with a 1-cell margin.
QRcode
• Engraving machine
A pneumatic pen is controlled with compressed air to mark a metal surface by
engraving.
• Printer
A printer can be used to print codes onto paper and different kinds of labels.
• Laser Marker
A laser marker can be used to mark metal objects. A laser marker can mark
very finely enabling the size of 2-dimensional codes can be reduced.
• Exposure Marking
Using exposure marking, particles are not created (unlike laser marking) and
even finder marking is possible than with laser marking. Exposure marking is
used with semiconductor wafers, LCD panels, and color filters that have
exposure processing.
Explanation
Finder pattern
DataMatrix
The black area is the margin.
SECTION 10
Appendix
V530-R160
285
Operation Manual