Calibration of telecentric cameras with an improved projection model

Kepeng Chen; Tielin Shi; Xiao Wang; Yichun Zhang; Yuan Hong; Qiang Liu; Guanglan Liao

doi:10.1117/1.OE.57.4.044103

13 April 2018 Calibration of telecentric cameras with an improved projection model

Kepeng Chen, Tielin Shi, Xiao Wang, Yichun Zhang, Yuan Hong, Qiang Liu, Guanglan Liao

Author Affiliations +

Optical Engineering, Vol. 57, Issue 4, 044103 (April 2018). https://doi.org/10.1117/1.OE.57.4.044103

Abstract

Telecentric lenses have been used for high-precision visual measurement systems because of their unique imaging properties, whereas the principal point is usually not considered in the projection model for calibration. Here, we propose an improved model containing the principal point for calibrating telecentric cameras. Detailed mathematical derivation from the pinhole model is performed. Then, an experimental setup is established. Two different telecentric cameras are used for verification. The results prove that calibrating telecentric cameras based on the improved model considering the principal point can achieve up to 55.37% higher accuracy and better stability than the common projection model without the principal point.

Citation Download Citation

Kepeng Chen, Tielin Shi, Xiao Wang, Yichun Zhang, Yuan Hong, Qiang Liu, and Guanglan Liao "Calibration of telecentric cameras with an improved projection model," Optical Engineering 57(4), 044103 (13 April 2018). https://doi.org/10.1117/1.OE.57.4.044103

Received: 15 December 2017; Accepted: 23 March 2018; Published: 13 April 2018

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