Please use this identifier to cite or link to this item: https://ktisis.cut.ac.cy/handle/10488/14278
Title: Accurate 3D scanning of damaged ancient greek inscriptions for revealing weathered letters
Authors: Papadaki, A. I. 
Agrafiotis, Panagiotis 
Georgopoulos, Andreas 
Prignitz, S. 
Major Field of Science: Engineering and Technology
Field Category: Civil Engineering
Keywords: 3D Scanning;Ancient Inscriptions;Structure from Motion;Structured Light Scanner;Weathered Letters Revealing
Issue Date: 18-Feb-2015
Source: 6th International Workshop on 3D Virtual Reconstruction and Visualization of Complex Architectures, 2015, vol. XL, pp. 237–243.
Volume: XL
Start page: 237
End page: 243
Journal: International Workshop on 3D Virtual Reconstruction and Visualization of Complex Architectures, 3D-ARCH 2015 
Abstract: In this paper two non-invasive non-destructive alternative techniques to the traditional and invasive technique of squeezes are presented alongside with specialized developed processing methods, aiming to help the epigraphists to reveal and analyse weathered letters in ancient Greek inscriptions carved in masonry or marble. The resulting 3D model would serve as a detailed basis for the epigraphists to try to decipher the inscription. The data were collected by using a Structured Light scanner. The creation of the final accurate three dimensional model is a complicated procedure requiring large computation cost and human effort. It includes the collection of geometric data in limited space and time, the creation of the surface, the noise filtering and the merging of individual surfaces. The use of structured light scanners is time consuming and requires costly hardware and software. Therefore an alternative methodology for collecting 3D data of the inscriptions was also implemented for reasons of comparison. Hence, image sequences from varying distances were collected using a calibrated DSLR camera aiming to reconstruct the 3D scene through SfM techniques in order to evaluate the efficiency and the level of precision and detail of the obtained reconstructed inscriptions. Problems in the acquisition processes as well as difficulties in the alignment step and mesh optimization are also encountered. A meta-processing framework is proposed and analysed. Finally, the results of processing and analysis and the different 3D models are critically inspected and then evaluated by a specialist in terms of accuracy, quality and detail of the model and the capability of revealing damaged and "hidden" letters.
Description: International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives, Volume 40, Issue 5W4, 2015, Pages 237-243
ISSN: 1682-1750
DOI: 10.5194/isprsarchives-XL-5-W4-237-2015
Rights: © ISPRS
Type: Article
Affiliation : Cyprus University of Technology 
National Technical University of Athens 
Berlin-Brandenburgische Akademie der Wissenschaften 
Appears in Collections:Δημοσιεύσεις σε συνέδρια /Conference papers or poster or presentation

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