Special Section on Optical Computational Imaging

Camera calibration for multidirectional flame chemiluminescence tomography

[+] Author Affiliations
Jia Wang

Xi’an Technological University, School of Optical and Electronic Engineering, Xi’an 710021, China

Nanjing University of Science and Technology, MIIT Key Laboratory of Advanced Solid Laser, Nanjing 210094, China

Weiguang Zhang, Yuhong Zhang, Xun Yu

Xi’an Technological University, School of Optical and Electronic Engineering, Xi’an 710021, China

Opt. Eng. 56(4), 041307 (Nov 23, 2016). doi:10.1117/1.OE.56.4.041307
History: Received May 13, 2016; Accepted November 2, 2016
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Abstract.  Flame chemiluminescence tomography (FCT), which combines computerized tomography theory and multidirectional chemiluminescence emission measurements, can realize instantaneous three-dimensional (3-D) diagnostics for flames with high spatial and temporal resolutions. One critical step of FCT is to record the projections by multiple cameras from different view angles. For high accuracy reconstructions, it requires that extrinsic parameters (the positions and orientations) and intrinsic parameters (especially the image distances) of cameras be accurately calibrated first. Taking the focus effect of the camera into account, a modified camera calibration method was presented for FCT, and a 3-D calibration pattern was designed to solve the parameters. The precision of the method was evaluated by reprojections of feature points to cameras with the calibration results. The maximum root mean square error of the feature points’ position is 1.42 pixels and 0.0064 mm for the image distance. An FCT system with 12 cameras was calibrated by the proposed method and the 3-D CH* intensity of a propane flame was measured. The results showed that the FCT system provides reasonable reconstruction accuracy using the camera’s calibration results.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Jia Wang ; Weiguang Zhang ; Yuhong Zhang and Xun Yu
"Camera calibration for multidirectional flame chemiluminescence tomography", Opt. Eng. 56(4), 041307 (Nov 23, 2016). ; http://dx.doi.org/10.1117/1.OE.56.4.041307


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