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Lighting Education


The Impact of Lighting Geometry on Image Contrast Enhancement

There are four image contrast enhancement concepts (Cornerstones) used for vision illumination: geometry, the spatial relationship between light and object; pattern, or structure — the shape of the light projected on the object; wavelength, or color — how light is differentially reflected or absorbed by the object and its immediate background; and filters, which differentially […]

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How Machine Vision Shaped the General LED Market

The Machine Vision Industry has had an interesting and critical role to play in the overall development of the LED Lighting Market.  Most people are unaware that the first commercially available LED lights were made exclusively for the Machine Vision Market.  This is easy to understand when you realize that the first LEDs with enough […]

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Food Contact and Aseptic Environment Considerations

Preventing contamination is a common priority for Food and Beverage processors. As these facilities grow and increase in efficiency, a single production run impacted by contamination can lead to a product recall and impact the health of tens of thousands of consumers. Until recently, metal detectors and X-rays played the dominant role, but increasingly the trend favors machine vision systems which have proven more effective at identifying small plastics and rubber contaminants. Continued implementation of machine vision for Extraneous Materials detection will help reduce food waste as well as lower costs and the risk of recalls.

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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.  When utilizing white LEDs, it’s important to understand that the radiated emissions are a combination of most of the wavelengths from the visible spectrum; for white LEDs, the color temperatures range from […]

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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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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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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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