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A Closer Look at Resolution Testing

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From reverse projection to modulation transfer function testing, there is more than one way to evaluate the resolution of a lens.

Patrick McKenna, edmund optics inc.

In the days of VGA video cameras and predominantly analog storage, it was easy to make an imaging lens that would outperform the camera’s ability to capture an image. That’s no longer the case. Where 640 pixels once stood, it is not uncommon today to see 6 million. Cameras continue to offer smaller pixels (and more of them), and all machine vision users — from the largest integrators to the lone person in the lab — want to get the most out of this plethora of pixels. Lens manufacturers have had to up their offerings, pushing the limits of optics, mechanics, and design...Read full article

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    Published: February 2019
    Glossary
    modulation transfer function
    Also called sine wave response and contrast transfer function. The modulation transfer function is the ratio of the modulation in the image to the modulation in the object as a function of frequency (cycles per unit length) of the sinusoidal wave pattern that describes both the object and image. A plot of the MTF against frequency is an almost universal measure of the performance of an image-forming optical system as it provides a measurement of the ability of an optical system to reproduce...
    machine vision
    Interpretation of an image of an object or scene through the use of optical noncontact sensing mechanisms for the purpose of obtaining information and/or controlling machines or processes.
    FeaturesMTFmodulation transfer functionTest & MeasurementImagingslanted-edge MTFcamerascamera testsreverse projectionmachine visionOpticsPatrick McKennaEdmund Optics Inc.

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