Omron V530-R2000 User Manual page 53

SECTION 4
Setting Read Conditions
n Meaning of Appraisal Items
The range of values displayed for appraisal items is 1 to 100.
Item
Light
Mark
Focus
Locate
Size
B.G.
V530-R2000
36
User's Manual
Appraises the contrast between black and white of the code, which changes with lighting
conditions.
The display value will increase as the distinction between white and black sections of the
code increases. A value of 1 will be displayed to indicate the minimum amount of contrast
required to read the code.
Appraises the number of cells that cannot be discerned in the finder pattern, timing pattern,
and data region.
The display value will decrease as the number of cells that cannot be discerned increases
and reading becomes unstable.
Appraises the focus of the image.
The 2D codes cannot be discerned if they are out of focus. The display value will increase
as the image goes out of focus.
Appraises the location of the code in the field of vision.
The display value will be high if the 2D code is in the center of the field of vision and low if it
is at the edge.
Appraises the sizes of the 2D code and the cells (dots).
The larger the code is in respect to the field of vision, the more accurate positioning must
be. The smaller the code, however, the smaller the cells. If the cells are smaller than the
resolution for imaging, then the cells cannot be discerned.
The display value will decrease when the code is too large or the cells are too small. Partic-
ularly when introducing a new system, adjust the relationship between the size of the code
and the field of vision to increase this value.
Appraises the background conditions where the 2D code is marked.
The display value will decrease the more the background contains patterns that resemble
codes. The display value will increase if the background is plain.
If the background is plain, then only the code needs to be discerned. If the background is
rough or contains geometric patterns, time may be required to read codes.
Description