Proceedings of the CIPA WG 6 International Workshop on Scanning for Cultural Heritage Recording

Böhler, Wolfgang

Bibliographic data

Monograph

Persistent identifier:: 830281592

Title:: Proceedings of the CIPA WG 6 International Workshop on Scanning for Cultural Heritage Recording

Sub title:: September, 1 - 2, 2002, Corfu, Greece

Scope:: 159 Seiten

Year of publication:: 2002

Place of publication:: Thessaloniki

Publisher of the original:: Publ. ZITI

Identifier (digital):: 830281592

Illustration:: Illustrationen

Signature of the source:: T 15 B 1303

Language:: English

Additional Notes:: Literaturangaben

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Editor:: Böhler, Wolfgang

Corporations:: International Workshop on Scanning for Cultural Heritage Recording, 2002, Kerkira; ICOMOS/ISPRS Committee for Documentation of Cultural Heritage

Adapter:: International Workshop on Scanning for Cultural Heritage Recording, 2002, Kerkira; ICOMOS/ISPRS Committee for Documentation of Cultural Heritage

Founder of work:: International Workshop on Scanning for Cultural Heritage Recording, 2002, Kerkira; ICOMOS/ISPRS Committee for Documentation of Cultural Heritage

Other corporate:: International Workshop on Scanning for Cultural Heritage Recording, 2002, Kerkira; ICOMOS/ISPRS Committee for Documentation of Cultural Heritage

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2015

Document type:: Monograph

Collection:: Earth sciences

Chapter

Title:: 4. DOCUMENTATION OF ARTIFACTS

Document type:: Monograph

Structure type:: Chapter

Chapter

Title:: SURFACE MODEL GENERATION BY THE RELICS FROM SLICE IMAGES, AND THE TRIAL TO THE AUTOMATIC RESTORATION. Y. Watanabe, K. Tanaka, N. Abe, H. Taki, Y. Kinoshita

Document type:: Monograph

Structure type:: Chapter

- 65 - EXPLORING A BYZANTINE CRYPT THROUGH A HIGH-RESOLUTION TEXTURE MAPPED 3D MODEL: COMBINING RANGE DATA AND PHOTOGRAMMETRY J - A Beraldin *, M. Picard , S.F. El-Hakim , G. Godin 3 , C. Latouche 3 , V. Valzano b , A. Bandicra h a Institute for Information Technology, National Research Council Canada, Ottawa, Ontario, Canada, K1A OR6 b SIBA Coordination, University of Lecce, Lecce, Italy, 73100 - siba@siba2.unile.it Commission V, Working Group V/2 KEY WORDS: Cultural Heritage, Virtual Reality, Laser scanning, Three-dimensional, Reconstruction, Texture, Registration, Photo-realism. ABSTRACT: In recent years, high-resolution recording of heritage sites has stimulated a lot of research in fields like photogrammetry, computer vision, and computer graphics. Numerous algorithms and methodologies have been proposed in the literature. In practice, what a 3D photographer needs is a commercially available solution to this so-called as-built documentation. In this paper, we present an effective approach for photo-realistic 3D model building from the combination of photogrammetry and 3D range data. The method is applied to the virtualization of a Byzantine Crypt where geometrically correct texture mapping is essential to render the environment accurately in order to produce enticing virtual visits, apply virtual restoration techniques on the frescoes and remove architectural elements that have been added over the years so that the site can then be viewed in the correct historical context. A movie entitled “CARPINIANA” was created in order to demonstrate the results. 1. INTRODUCTION The capacity to create, display, manipulate, archive and share a digital representation of the shape and appearance of an existing object (as-built documentation) finds a most challenging class of applications in high-resolution recording of heritage-related objects and sites. Once the object or site has been “virtualized”, one can use immersive technologies to study or to promote a cultural site using a virtual 3D visit. However, beyond photo-realistic rendering, a 3D model contains a wealth of information that can be analyzed and enhanced. Features that are small or only visible from a distance can be interactively examined, thus, allowing the study of fine details such as tool marks or surface texture. Furthermore, sites that must be closed for conservation reasons can still be studied and visited once a 3D model has been created. Computer-based visual enhancement and analysis techniques can be applied to the digital model in all of these situations. One such application is found in virtual restoration of an historical site. As opposed to "traditional" restoration that is performed on the physical object or site (usually not reversible), virtual restoration is applied directly onto the digital copy hence reversible. For instance, it allows the optimization of the legibility of textual and artistic informative data, without turning to interventions often traumatic for the original copy (SIBA Web Site). Or in some instances, architectural elements that have been added over the years can be removed and the digital 3D model of a site can then be viewed in the correct historical context. As a way to demonstrate the proposed modeling method, we selected a Byzantine Crypt (see Fig.l). Though not part of a typical tourist itinerary in Italy, this rupestrian site contains amongst the oldest Byzantine frescoes that signed and dated. It is known as the Crypt of Santa Cristina and is located in Carpignano Salentino in Apulia (Bandiera 1980). This Crypt measures about 16.5 m by 10 m by 2.5 m. This one thousand year old crypt presented many challenges from the technical and historical point of view. The Crypt also contains an altar and three pillars added during the Baroque period. In order to model a complete site like this Crypt, a 3D photographer would have to be skilled in a number of 3D modeling procedures. The 3D photographer could be a specialist that does this type of work on contract basis. Or, in cases where the property of data is of concern, it can even be a technician directly link to the agency requesting the work. Whichever case it may be, the combination of range data with photogrammetry was examined from a user point of view. Numerous papers have dealt with this issue, but one problem remains to be addressed i.e. the availability of commercial tools for both 3D modeling and high-resolution texture mapping onto dense 3D models. Very few solutions exist on the market addressing this issue. We report an effective approach based on commercial software to the problem of high-resolution photo-realistic texture mapping onto a 3D model generated from range images. Section 2 presents an overview of the processing pipeline and section 3 describes the elements used in that pipeline. Section 4 shows how these elements were put together for the Byzantine Crypt. Finally, concluding remarks appear in section 5. a) b) Figure 1. Byzantine Crypt IX-X, a) the two outside entrances, b) view of the interior located underground. * Corresponding author. J-A Beraldin, angelo.beraldin@nrc.ca, http://www.vit.iit.nrc.ca NRC 44916 Currently completing its Master’s thesis (Université Laval, Qué, Canada) as a guest worker at the NRC Ottawa

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