Calibrating a camera focused on a long shot using a calibration plate and defocused corner points

Yichao Li; Suping Fang

doi:10.1117/1.OE.58.6.063103

13 June 2019 Calibrating a camera focused on a long shot using a calibration plate and defocused corner points

Yichao Li, Suping Fang

Author Affiliations +

Optical Engineering, Vol. 58, Issue 6, 063103 (June 2019). https://doi.org/10.1117/1.OE.58.6.063103

Abstract

When focusing on a long shot, it is very difficult to calibrate a camera with high precision. We propose a method of obtaining a close shot of the calibration plate, extracting corner points from the defocused image of the calibration plate, and constructing a three-dimensional control point to calibrate the camera. We construct a defocused corner template and extract the corner points from the defocused image of the calibration plate using the normalized cross-correlation algorithm. Experimental results show that, after the camera has been calibrated by this method, the average pixel distance accuracy of the re-projected detection point pixel at 40 m reaches 1.9 pixels. The average spatial distance accuracy of the corresponding three-dimensional point reaches 2.1 mm.

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Yichao Li and Suping Fang "Calibrating a camera focused on a long shot using a calibration plate and defocused corner points," Optical Engineering 58(6), 063103 (13 June 2019). https://doi.org/10.1117/1.OE.58.6.063103

Received: 4 December 2018; Accepted: 10 May 2019; Published: 13 June 2019

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KEYWORDS

Calibration

Cameras

Optical engineering

3D acquisition

Platinum

Point spread functions

3D image processing

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