Read articles written by our experts for leading industrial publications

Machine Vision and Photometry Inspect Automotive Symbols

Quality of backlit symbols is determined equally by their brightness, color, and uniformity of illumination as it is by their dimensional integrity. Read an article to learn how photometric capabilities (for measuring brightness and color) and computer vision capabilities (for evaluating shape and defects) come together to provide the ultimate visual inspection solution for automotive symbols. 

Published by Vision Spectra in Spring 2022.

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Understanding Novel Methods for XR Optical Testing - Interview with Davis Bowling

Optical testing is needed, but which test equipment and methods are best for evaluating quality at each element—and which are ideal for final assembly inspection, when the visual output of the holistic design is viewed through the headset?

In this interview with AZO Optics, Davis Bowling, Sales Manager - North America at Radiant Vision Systems, discusses common performance issues specific to each component of an XR device, novel optical test methods, and Radiant's portfolio of measurement solutions that provide critical data for quality control at each stage of XR design and manufacture.

Published by AZO Optics on January 20, 2022.

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Measuring and correcting pixels during production to ensure visual quality of OLED, miniLED, and microLED displays

Display pixels are constantly changing. Higher resolutions in smart devices, augmented and virtual reality headsets, and TV screens have made pixels smaller, while the pursuit of contrast has demanded pixels with brighter brights and blacker blacks. Not all pixels are created equal, however. For this reason, manufacturers of display devices have turned from LCD (liquid crystal display) technology toward new OLED (organic light-emitting diode), miniLED, and microLED technologies. This shift has provided consumers with improved visual experiences but has added production challenges for display manufacturers.

Published by Consumer Electronics Test & Development December 13, 2021.

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How to use automated inspection to improve quality and efficiency in the production of display technology?

Imaging Colorimeters have become an essential tool for development and production of display technology due to their ability to quickly obtain luminance and chromaticity information with the quantification of contrast, uniformity, mura, light leakage or dead pixels.

This recent article in Consumer Electronics Test & Development explains how the expertise and technology of the Konica Minolta Group can be leveraged to improve outcomes in the high-volume display industry.

Published by in July 2021.

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Optical Tests for Automotive Displays

industry. However, procedures that have been used so far and the use of simple image processing cameras often do not do justice to the task at hand. The displays used in automobiles are developing rapidly. The size and the resolution are constantly increasing to the extent that the 15.6 inch diagonals and 1920 x 1200 pixels find their way into the middle class.

Published by Automobil Elektronik I on October 22, 2019.

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Enterprise Applications for Augmented/Virtual Reality Offer Machine Vision Real-World Opportunities

In this article, Radiant Vision Systems Chief Solutions Officer, Doug Kreysar, contributes his thoughts on AR/VR technology development, which brings together camera systems, near-IR eye tracking, gesture recognition, and other machine vision capabilities that improve the visual performance and extend the application of AR/VR headsets.

Published by AIA Vision Online on December 5, 2019.

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Optics Replicate Human Vision in AR/VR Display Testing

Officer) and Eric Eisenberg (Applications Engineering Manager) describe optimal imaging system specifications for measuring near-eye displays (NEDs), with a FOV to cover the typical range of AR/VR devices (ranging up to 100 to 120 degrees horizontal) and entrance pupil position (aperture of the lens) at the front of the imaging solution's optical system.

Published by Laser Focus World on June 1, 2019.

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How to Use Imaging Colorimeters for Automated Visual Inspection of Displays in Production

testing for every display on the line is critical. The use of imaging colorimeter systems and associated analytical software to assess display brightness, color uniformity, and contrast—and to identify defects in displays—is well established. In this article, we describe how imaging colorimetry can be used in a fully-automated testing system to identify and quantify defects in high-speed, high-volume production environments. We will also cover the test setup and the range of tests that can be performed—spanning simple point defect detection through complex mura detection and evaluation.

Published by Global LEDs/OLEDs on March 25, 2019.

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Vital Signs: Luminator Aerospace Ramps Up Backlit Sign Testing using Radiant

consist product quality using Radiant ProMetric® Imaging Colorimeters.

Published by Aircraft Interiors International on March 1, 2019.

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Machine Vision Enters Augmented and Virtual Reality Environments

Radiant Vision Systems Chief Solutions Officer, Doug Kreysar, contributes his thoughts on the AR/VR display market, focusing on the importance of unique optics for measuring the quality of displays integrated within augmented and virtual reality headsets.

Published by AIA Vision Online on October 5, 2018.

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What's the Optimal Assembly Verification Method for Tough Inspection Tasks?

machine learning techniques. By understanding the difference between human inspection, machine vision inspection, and the latest advances in photometric-based inspection techniques, developers can choose the best tool for the inspection task at hand.

Published by Vision Systems Design on October 1, 2018.

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How to Use Imaging Colorimeters to Improve OLED Display Production Testing Efficiency and Yields

ther display technologies. As OLED manufacturers work to launch commercially viable OLED-based products, high costs due to manufacturing yield issues have hindered widespread OLED technology adoption, most dramatically in large-format implementations, as they drive up end customer prices. This article describes how to use imaging colorimeters to improve OLED display production testing efficiency and yields for optimal price/performance.

Published by Global LEDs/OLEDs on September 1, 2018.

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How to Use Imaging Colorimeters to Improve OLED Display Quality

common in OLED displays, and correction methods that can be used to adjust the output of individual pixels of emissive displays (like OLED, microLED, and others) to ensure uniformity of brightness and color, preventing waste of "defective" materials and improving manufacturing efficiency.

Published by EE Publishers on June 6, 2018.

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Information Display Interviews Doug Kreysar, Chief Solutions Officer at Radiant Vision Systems

company's target markets, growth into the machine vision inspection sector, and new product releases in AR/VR display measurement for augmented and virtual reality devices.

Published by SID Information Display on May/June 2018.

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Choosing a Measurement System for LED Sources, Luminaires, and Displays

increasingly used as an alternative to more traditional technologies. The intended purpose of the measurement – to inform development, to characterize or evaluate finished products, for production quality control, or for in-use performance assessment – determines the photometric and colorimetric quantities that are important to measure. This – plus constraints on measurement time, accuracy, and cost – determine options for measurement methods. We survey a number of measurement methods that generate either near-field or far-field models of the LED or luminaire and evaluate their strengths and weaknesses to guide us in selecting the right measurement method for the application. Of particular interest is not only the measurement of individual LEDs, but also the measurement of LED arrays, luminaires, and displays. 

Published by Global LEDs/OLEDs on February 9, 2018.

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Automated Solutions for SAE Standard HUD Measurement

measurement, and benefits of photometric imaging systems for efficiency, paired with software to enable fully-automated HUD testing to SAE standards.

Published by INSPECT on August 3, 2017.

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Applying Automation for Efficient Head-Up Display Production

requirements of the new SAE J1757-2 standard and outlines the advantages of automated measurement systems.

Published by Sensors Online on December 15, 2017.

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Understanding CCD Camera Resolution and Dynamic Range

complex than simple definitions suggest. In this article, you'll learn the keys for evaluating CCD cameras—such as resolution, dynamic range, signal-to-noise ratio, and pixel size—that will allow you to determine true functional system performance.

Published by Sensors Online on December 1, 2017.

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