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Title: Digital camera calibration for cultural heritage documentation: the case study of a mass digitization project of religious monuments in Cyprus
Authors: Evagorou, Evagoras S. 
Mettas, Christodoulos 
Agapiou, Athos 
Themistocleous, Kyriacos 
Papavasileiou, Spyridon 
Hadjimitsis, Diofantos G. 
Major Field of Science: Natural Sciences
Field Category: Computer and Information Sciences
Keywords: Camera calibration;Cultural heritage;Lens distortion;Pre-calibration;Self-calibration
Issue Date: 2021
Source: European Journal of Remote Sensing, 2021, vol. 54, no. s1, pp. 6-17
Volume: 54
Issue: s1
Start page: 6
End page: 17
Project: ERATOSTHENES: Excellence Research Centre for Earth Surveillance and Space-Based Monitoring of the Environment 
Journal: European journal of remote sensing 
Abstract: The paper summarizes the methodology followed, to evaluate the accuracy of different digitization methods of ecclesiastical monuments in 3D computer vision form and stresses the importance of photographic equipment calibration. In this study, a set of images were taken using the CANON EOS M5 digital camera, while the internal calibration parameters–horizontal and vertical focal length (fx, fy), principal point coordinates (x0, y0), radial distortion coefficients (K1, K2, K3), tangential distortion coefficients (P1, P2) and the affinity and the shear terms (b1, b2) were estimated. These parameters were calculated using different software applications and then analyzed. For the calibration procedure, 3D texture models were built with the Agisoft commercial software based on: (a) the aforementioned calibration parameters and (b) the self-calibration process. The overall accuracy (Root Mean Square–RMS) between these models, by comparing known geo-referenced ground-control-points (GCP) is presented through the Cloud Compare software. The results indicate that the internal calibration parameters of the digital camera used for documentation purposes are essential and should be systematically implemented for documentation purposes.
ISSN: 2279-7254
DOI: 10.1080/22797254.2020.1810131
Rights: © The Author(s).
Type: Article
Affiliation : Cyprus University of Technology 
ERATOSTHENES Centre of Excellence 
Holy Bishopric of Limassol 
Appears in Collections:Publications under the auspices of the EXCELSIOR H2020 Teaming Project/ERATOSTHENES Centre of Excellence

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