Chapter
5
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LECTOR®620
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Parameters
5.7.5
Increase 2D performance
It is possible to optimize the decoding process for 2D codes via the parameters for the
group. The parameters can be used to eliminate interference,
thereby increasing device performance.
Adapting the settings to suit the application reduces the decoding time and increases both
reading reliability and the readability of low-contrast, 2D codes.
5.7.5.1
Code contrast
To find the codes in the reading field, the image taken is searched thoroughly for structures
with sufficiently large contrast variations. A code pattern is only expected within these struc-
tures.
A minimum value for these contrast variations is defined in % via the
meter. Areas where the contrast is below the defined value are not searched for code pat-
terns.
• To read low-contrast codes reliably regardless, a low value (e.g., 10%) must be set. This
does, however, increase the decoding time, as it involves searching a larger image area.
• For high-contrast codes, the value can be increased accordingly. In this case, a correspon-
dingly smaller image area is searched, which reduces the decoding time.
5.7.5.2
Code background
The decoding process can be limited to codes with a light or dank background color using
the
parameter, which reduces the decoding time.
• W
HITE
: Only dark codes on a light background are read.
• B
LACK
: Only light codes on a dark background (inverted codes) are read.
• B
OTH
: Both dark codes on a light background and light codes on a dark background (in-
verted codes) are read.
5.7.5.3
Code alignment
The decoding process can be limited to mirrored or non-mirrored codes using the
parameter, which reduces the decoding time.
• N
ORMAL
: Only non-mirrored codes can be decoded correctly.
• M
IRRORED
: Only mirrored codes that have been recorded from below through a glass pane,
for example, can be decoded correctly. This required the images taken prior to the decoding
process to be mirrored once again.
• B
OTH
: Both mirrored and non-mirrored codes are read.