Patent ID: 11930569
Assignee: PROCEMEX OY
Field: Measurement (Instruments)
Classification: CPC G  H  D  F | IPC F  G  H

Claim 6:
7. A machine vision system for detecting deviations from a wood fibre web, wherein the machine vision system comprises:
an LED matrix lighting device for illuminating a lighting pattern with even intensity, the LED matrix lighting device comprises a plurality of LEDs, a collimating lens in front of each LED for collimating light of the LED, and a light refracting element in front of collimating lenses arranged to refract light of at least a first part of the LEDs with a different refraction angle than at least a second part of the LEDs, and wherein current provided for at least one LED is adjustable based on detected intensity deviations in a captured image, and which a FWHM viewing angle of the collimated light of LEDs is substantially as large as the difference between the refraction angles,
at least one imaging device for capturing images of the illuminated area, and
a data processing device.