Omron V530-R150E-3 -, Operation Manual

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Improving Reading
Section 9-1
9-1 Improving Reading
If correct reading is not performed, check the items listed below.
9-1-1 Environment and Setup
9-1-2 Increasing Speed
Normal Mode (QR Code or Data Matrix)
Processing may be slowed down by unnecessary images in the back-
ground. Adjust the field of vision and settings in Image Adjust/BGS
Levels so that unnecessary images are not included in the back-
ground. For Data Matrix reading in Normal mode, set the background
cut level to medium or strong.
Pattern Mode (QR Code or Data Matrix)
The processing speed may be increased by making the changes
below. These changes, however, may result in incorrect reading, so
confirm correct reading operation after the changes are made.
• Make the search region smaller.
• Increase the pixel skipping parameter.
Image Adjust the lighting and the focus to produce a suitable image. The image can be
checked in real time by switching to a through image.
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Lighting Use appropriate lighting for the application and the read object. The reading
accuracy can be improved significantly by changing the lighting.
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Field of vision If the code image is too large, not all of it can be read resulting in an NG reading
(because of hollowing of dots). This can be prevented by increasing the field of
vision.
If reading of a Data Matrix code made up of dots is not possible in Normal mode,
try increasing the field of vision and thereby reducing the influence of dots.
If the cell recognition coordinates are incorrect, try increasing cell recognition
accuracy by decreasing the field of vision and thereby making the code image
larger.
Adjust the field of vision so that the number of pixels per cell is at least 5. For
Data Matrix reading in Pattern mode, the number of pixels per cell must be at
least 10.
Try changing the lens configuration and the field of vision. Under normal condi-
tions, it is recommended that settings are made so that the number of pixels per
cell is between 7 and 12.
Margins Normally, it is necessary to have a margin around the code of at least 4 cells. For
QR Code reading in Pattern mode, however, correct reading is possible with a
margin of only 1 cell.