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Application Notes

board of lights with different LED color temperatures

LED Color Temperature in Machine Vision

When specifying LED lighting for machine vision applications, the LED wavelength can have a significant impact on the success of the vision inspection. For this reason, it’s important to understand the concept of color temperature: how it’s measured, its impact on the success of your vision system, and how to ensure you source the best white LED light for your application.

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inspection of cement boards using Ai High Intensity Bar Lights and a Competitive Light

CSI, Inc. Cement Board Inspection Application

Control Systems Integrators, Inc. was contacted to configure a lighting solution for a customer inspecting white fiber-cement boards. The motion inspection through an enclosed tunnel posed a unique challenge, and Bar Lights from Advanced illumination assisted in the vision inspection solution.

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input images of a vitamin bottle bottom inspected with a DF198 MicroBrite Diffuse Ring Light and DCS-400E Quad Controller, and the final processed image of the bottom of the bottle using photometric stereo

Photometric Stereo Technique

For many surfaces, simple defects such as scratches and dents are easily identifiable with a machine vision camera and a traditional lighting solution. However, some objects have 3D aspects that make accurately identifying surface defects more difficult. To achieve feature-appropriate surface contrast to gather a 3D perspective, Photometric Stereo may be applied.

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lot or date code on motor oil bottle visible under UV light

When Adequate Lighting Isn’t “Good Enough”

Today there is a wide variety of lighting sources, types, geometries, and wavelengths available for vision engineers to apply, often with more than one type or geometry functioning adequately.  But with the many overlapping choices, how do we determine whether a lighting solution is, or is not, truly “good enough”?

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inspection of code on a cylindrical surface

Cylindrical Surface Inspection

Not all surfaces respond similarly to standard direct illumination techniques. Surface color, texture, shape, and composition can all influence where and how much of the incident light is reflected into a vision camera, greatly affecting the inspection results. Read on for our example of inspecting a cylindrical surface.

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