Chapter-2
Before Using
NLV-5201 User's Manual
26
1st
Scanned Media and Placement
2.11
When an object is being scanned, there are conditions where specular reflection of the LED
illumination and intense ambient light can occur easily.
Solution for Specular Reflection of the LED Illumination
2.11.1
Problem: Glossy label
Specular reflection of the LED illumination from the scanner can occur when the target label is on a
highly reflective surface.
Solution:
Specular reflection does not occur when an angle is created between the scanner and the target label
as shown in the figure below. The conditions for the occurrence of specular reflection depend on the
distance L and the inclination angle θ. The recommended inclination angle is about 15 degrees. Note
that as the angle becomes bigger, it becomes more difficult to read the target label.
*For the background, use non-specular surface within the image range.
*Obtain the image in the actual environment and evaluate it. The software tools for image capture can be found
on the Opticon website.
θ
L
Background
Scanned target
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