Abstract
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.
Highlights
Visualization of buildings and infrastructure in 3D form has been widely applied mainly through photo grammetric procedures
The 3D data obtained from 3D scanning and photogrammetry technologies are fast and low-cost especially when compared to traditional documentation methods. 3D modeling through terrestrial laser scanners (TLS) and closerange photogrammetry are widely used in various sectors, including Historic Building Information Modelling (HBIM) (Themistocleous et al, 2018)
The “Digital Aposphragisma (Imprint) of Hagionymous Islands” project aims to develop a robust methodology for mass digitization, that requires both fast and accurate documentation and processing
Summary
Visualization of buildings and infrastructure in 3D form has been widely applied mainly through photo grammetric procedures. The project “Digital Aposphragisma (Imprint) of Hagionymous Islands” aims to implement traditional topographic and photogrammetric methods for doc umentation and management purposes, as well as the promotion of ecclesiastical cultural heritage. The “Digital Aposphragisma (Imprint) of Hagionymous Islands” project aims to develop a robust methodology for mass digitization, that requires both fast and accurate documentation and processing. For this reason, the digital documentation record of the ecclesiastical cultural heritage of the island of Cyprus includes a variety of documentation procedures such as close-range photographs, stereo pairs, images from Unmanned Aerial Vehicles (UAVs), point clouds from terrestrial laser scanners (TLS), points from Total Stations, etc., both internally and externally of building facades and relics of selected monuments
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