Good machine vision lighting does not simply make a scene brighter. Its purpose is to create a repeatable optical difference between the feature of interest and its surroundings so a camera and image-processing system can evaluate it consistently.
Image Contrast
Light the Feature the Camera Must Detect
Surface texture, shape, reflectivity, material, color, finish, and orientation all influence the way a part reflects light.
Industrial machine vision systems combine imaging hardware and software to inspect, measure, identify, or guide automated processes.
Optical Inspection
Inspection Depends on Controlled Illumination
Optical inspection systems can use cameras and controlled illumination to evaluate products or process conditions.
The lighting arrangement must be selected around the feature the inspection is intended to reveal.
Lighting Geometry
Different Angles Reveal Different Features
Direct lighting can emphasize certain surface features while low-angle lighting can highlight edges and raised details. Backlighting can create a silhouette, while diffuse illumination can reduce strong reflections on shiny or curved parts.
Ring Lights
Lighting Around the Camera Axis
Ring lights place LEDs around the camera or lens, providing a compact geometry for many inspection stations.
Their usefulness depends on working distance, surface geometry, reflectivity, lens position, and required image contrast.
Backlighting
Create Strong Silhouette Contrast
A backlight positioned behind a part can create a high-contrast outline useful for dimensional, profile, edge, presence, and opening inspections.
Wavelength & Filters
Spectral Selection Can Change Image Contrast
Colored LEDs, optical filters, polarized components, and camera sensitivity can be combined to alter how different surfaces appear in the captured image.
Optical Filters & Windows →Triggering
Synchronize Lighting With Image Capture
Machine vision lighting can operate continuously or be triggered in coordination with camera exposure and machine motion.
Control timing, electrical drive, exposure, and thermal limits must remain compatible with the complete lighting system.
Selection