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Getting the Picture on Quality Control

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The shrinking dimensions of display components means that critical defects are also getting smaller and harder to spot.

HANK HOGAN, CONTRIBUTING EDITOR, [email protected]

As product and manufacturing specifications tighten, imaging for industrial quality control (QC) faces challenges. For one thing, the tolerances that parts must be inspected to are more exacting. For another, specifications for layer composition, subsurface features, surface roughness and other characteristics also are more stringent. At the same time, required throughput often is increasing. Imaging colorimeters measure light and color to evaluate the quality of illuminated displays in-line. Using high-resolution CCDs, these imaging systems capture an entire display in a single image...Read full article

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    Published: May 2017
    Glossary
    polarization imaging
    A subsurface imaging technique based upon the polarization of light reflected off an object. The polarization of reflected light gives information about the object's absorption properties that traditional intensity sensors are not capable of obtaining. The characteristics gained through the technique coupled with computer vision programs can effectively complete image-segmentation and object orientation tasks, enabling novel techniques for noninvasive surface and beneath-the-surface imaging.
    FeaturesImagingcamerasHank HoganPolarization Imaging

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