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Chapter 3: Theory
Operators & Maintenance Manual GENIUS Compact Version UK 0.1 © BESTnv
BESTnv Industrial Research BV, Marinus van Meelweg 20, 5657 EN, EINDHOVEN, THE NETHERLANDS
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3.2. Theoretical background
3.2.1. Cameras
All cameras used in the GENIUS Compact are line scan cameras, meaning that they only scan one line
at a time, at a fi xed frequency.
RGB(I) or -colour cameras “see” three colours: Red, Green, Blue and/or Infrared.
Monochromatic cameras can only distinguish different grey levels in one specifi c wavelength.
The length of the camera scan line must always be set equal to the width of the product stream on the
belt that you wish to scan.
In other words, the length of the scan line is not always equal to the full width of the detection belt. Some
cameras only scan half the belt (see pictures GENIUS Compact-B and GENIUS Compact-N) or even a
specifi c small split part of the belt (with ARS or DRS return systems).
The width of the scan line on the belt however, is relative to the speed of the belt and the integration time
of the sorting computers. It is therefore important to have a fi xed and stable belt speed. Any fl uctuations
or changes in belt speed may adversely affect the optical sorting effi ciency (the faster the belt in relation
to the scan frequency, the less details can be detected).
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