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Distortion and Telecentricity

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Distortion and Telecentricity

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  • Author: Gregory Hollows, Nicholas James
Another advantage of using telecentric lenses in metrology applications is that telecentric lenses typically have lower distortion values than fixed focal length lenses. Distortion causes the actual position of an object to appear as though it is in a different location, which can further decrease measurement accuracy. While it is true that distortion can be calibrated out of images to partially improve the accuracy, the parallax is still present and will cause error. The other advantage to not needing to calibrate out the distortion from the telecentric lens is that the measurement process can run faster as there is less computing that the software needs to do, reducing CPU load and directly leading to higher system throughput and more parts measured per minute.

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