LED matrix lighting device
AssigneeProcemex Oy
InventorJari Ritoniemi
Life of this patent
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Abstract
An LED matrix lighting device for illuminating a lighting pattern with even intensity. The LED matrix lighting device includes 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. The disclosure further relates to a machine vision system, a method, and a computer program product.
Claims10
An LED matrix lighting device for illuminating a lighting pattern with even intensity, the LED matrix lighting device comprising 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.
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.
A method comprising:
- obtaining image data,
- analyzing image data,
- detecting intensity deviations in an illumination pattern provided by an LED matrix lighting device in the captured images, which LED matrix lighting device comprising 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, and
- adjusting current provided for at least one LED of the LED matrix lighting device based on detected intensity deviations in a captured image.
A computer program product embodied on a non-transitory computer readable medium, comprising computer program code configured to, when executed on at least one processor, cause a system to perform the method comprising:
- obtaining image data,
- analyzing image data,
- detecting intensity deviations in an illumination pattern provided by an LED matrix lighting device in the captured images, which 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, and
- adjusting current provided for at least one LED of the LED matrix lighting device based on detected intensity deviations in a captured image.
Dependencies are inferred from the claim text.