Optical graders
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Instead of grading or sizing we should call it a product optical selections system.

Sizing onions or potatoes optically

How does optical grading function?

  1. the product is aligned
  2. the aligned product is placed on cups
  3. each unit is photographed under different angles with different light of different wavelengths

The computer creates a virtual image of each unit with, for instance, the following information (depending on the level of sophistication of the installation):

  1. Size
  2. Color
  3. Shape
  4. Spots, discoloration
  5. Possible rot etc.

This way the computer knows everything there is to know of each unit. The cups with the units travel along the grader and are dumped into the corresponding grader outlet.

This way of grading, for instance onions, makes it possible to grade onions by their size, physical form, with or without spots, by their color etc. The possibilities are infinite and only depends on how sophisticated the computer, photographic equipment is and how many different outlets the system has.

the optical part of a optical grader

Here the images are created from different angles and with light of different wavelength. The computer creates a virtual image of each onion on each dish.

the cups that transport the onions to the correct out let of an optical grader

The dishes with the onions travel along the grader and are dumped in the corresponding outlet. The outlets are located between gray bars.

the many product outlets of an optical grader

Look how many outputs this grader has! Each output represents a different kind of onion, depending on their size, color, stained or otherwise. The possibilities are endless.

Watch the movie to see how it all comes together and functions.

Next up: Roller graders

These, crop selection, systems are capable of selecting the product not only according size, but also according: colour, stains, shape, rot etc. The possibilities are infinite and only depend on the level of sophistication of the installation.


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