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The Riddle of the Crosses: The Crusaders in the Holy Sepulchre

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Electronic Visualisation and the Arts (EVA)

Electronic Visualisation and the Arts

9 - 13 July 2018

Jerusalem, Church, Chapel, St Helena, Crusaders, Crosses, RTI, Photogrammetry, Gigapan

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      Abstract

      This paper describes the rationale, the challenges and the imaging solutions employed in an attempt to uncover a centuries-old riddle. We suggest an answer to the meaning of the hundreds of crosses, inscribed on the walls and behind the altar of the Chapel of Saint Helena, within the Church of The Holy Sepulchre in Jerusalem. Traditionally, these crosses have been ascribed to the Crusaders of the 12th and 13th centuries, but our research suggests a different chronology. A variety of photographic and photogrammetric imaging technologies have been utilised, along with traditional archaeological research, in an intensive attempt to document as much empirical data as possible during a short period when renovations to the chapel created a small window of opportunity for access. Despite considerable difficulties relating to time and location, three primary goals were set: (1) to capture a 3D representation of the curvature and depth information of the walls covering an overall high-resolution grid of all the stones behind the two central apses; (2) to make a detailed RTI representation of selected stones; and (3) to analyse the chiselling technique of the crosses and decipher the inscriptions and heraldic symbols found near the inscriptions. Three main imaging techniques were employed: 2D panoramic high-resolution Gigapan photography, 3D photogrammetry, and Reflectance Transformation Imaging. The results of the data collected are currently undergoing analysis in an attempt to establish the chronology, typology, and stratigraphy of the incisions. We hope that this will assist in confirming, correcting or rejecting the traditional explanations ascribing the graffiti crosses to the Crusader period. Analysis of the chiselled incisions on the stone reveals regular V-profile grooves. The angles are determined by using a photometric stereo ('shape from shading') image processing technique to determine the surface normal-vectors at each pixel position. Issues relating to the non-ideal 'real-world' conditions of capturing the images will be discussed, including camera movement, ambient light, and accuracy of light position coordinates from the highlights on the billiard ball.

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      3D Models for Cultural Heritage: Beyond Plain Visualization

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        Comparison of laser scanning, photogrammetry and SFM-MVS pipeline applied in structures and artificial surfaces

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          Non-expensive 3D documentation and modelling of historical object and archaeological artefacts using close-range photogrammetry

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            Author and article information

            Affiliations
            Hadassah Academic College

            Jerusalem, Israel
            University College of London

            London

            United Kingdom
            Israel Antiquities Authority

            Jerusalem, Israel
            Contributors
            Conference
            July 2018
            July 2018
            : 132-139
            10.14236/ewic/EVA2018.28
            © Caine et al. Published by BCS Learning and Development Ltd. Proceedings of EVA London 2018, UK

            This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

            Electronic Visualisation and the Arts
            EVA
            London, UK
            9 - 13 July 2018
            Electronic Workshops in Computing (eWiC)
            Electronic Visualisation and the Arts
            Product
            Product Information: 1477-9358 BCS Learning & Development
            Self URI (journal page): https://ewic.bcs.org/
            Categories
            Electronic Workshops in Computing

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