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:: 5. PROJECTS AND EXPERIENCES

Document type:: Monograph

Structure type:: Chapter

Chapter

Title:: LASER SCANNING AND TRADITIONAL SURVEY INTEGRATION TO BUILD A COMPLETE 3D DIGITAL MODEL OF "SAGRESTIA DELL'ARCHIVIO DI STATO A MANTOVA". Roberto Cantoni, Giorgio Vassena, Carlo Lanzi

Document type:: Monograph

Structure type:: Chapter

- 105 - LASER SCANNING AND TRADITIONAL SURVEY INTEGRATION TO BUILD A COMPLETE 3D DIGITAL MODEL OF “SAGRESTIA DELL’ARCHIVIO DI STATO A MANTOVA” Roberto Cantoni a , Giorgio Vassena a , Carlo Lanzi a d University of Brescia, Civil Engineering Dep. Via Branze, 38 - 25123 Brescia Italy Tel. +39.030.3715516 Fax. +39.030.3715503 E.mail: robypost@mail.tele.dk vassena@bsing.ing.unibs.it lanzi@bsing.ing.unibs.it KEY WORDS: Laser scanning, digitai model, cultural heritage recording ABSTRACT: The main tasks of this work consisted of the look for an integration between methods of traditional survey and laser scanning technique in the 3D architectures survey. The intentions to build a model that is able to satisfy the demands of precision, for example, to planning an intervention of recovery and therefore to editing architectural plates, but also those of aesthetical quality and representative effectiveness, they have conditioned the choices that have driven this work. In other words has been estimated the effectiveness and the potentialities of this new survey method , which in this case was supported and assisted with traditional methods that have also allowed to test the model obtained from laser scanner. During this work we have realized how this new method of survey, that allows a quick acquisition of million points, that allows the description of even very complex geometries, imposes many evaluations beginning from the fitter tool until the choice of target points and about the method of textures mapping, which are very important for the quality of final digital model. 1. INTRODUCTION The Sacristy of State archives in Mantova, is an architecture that allows to appraise the effectiveness of this integration: inside the Sacristy there are many decorations and plasters that would require a long and hard-working traditional survey. The Sacristy has an octagonal plant, 15 meters high and about 12 meters wide. There are many ways of creating 3D model of a building and many technologies can be employed to record the spatial and visual complexity of real word environments. The work described in this paper, wants to underline the necessity to integrate these different techonolgies to optimize the costs, accuracy and visual quality of the final 3D model. Another important thing is the approach to create a complete 3D not limited to an internal or anyway partial reconstruction but a full 3D composed from an internal end external surface to create the as completed as possible representation. In this way is also possible to give a more realistic perception about the building volumes. The 3D model obteined is not only a photo-realistic representation of the reality building but is also dimensionally rigorous so it has also an important metric value which makes it a powerful tool of investigation and study of the architecture. Is important to underline how from such product is possible to obtain a series of graphic useful results for the planning and design of interventions to the building safeguard. 2. LASER SCANNING SURVEY The laser scanning survey was made with Cyrax 2500 laser sensor, that has single point accuracy equal to ± 6mm. The scanning procedure took up 1 working day, using 15 different viewpoints. In some of these the scanner was mounted on a tri pod while for the other it was just leaned on the floor. The scanning survey has been articulated in the follow steps. • Planning the distribution of laser viewpoints. • Laser data acquisition. • Images acquisition by digital camera. • Scans merging and orientation in an absolute reference system. • Meshing to produce a triangulated 3D. • Editing operations on the 3D model. • Texturing the photograph images on the geometric model. In the most cases it is not possible to have complete 3D representation from data acquired at a single viewpoint. Indeed, to resolve occlusions in the scene or to reconstruct large scenes, it is required to have 3D data acquired from multiple viewpoints. So it was necessary to locate the sensor at several positions inside the sacristy, since all surfaces may no be visible from a single point or will data be acquired at sufficient resolution. The problem of determining the next capture point depends on how much a priori information about the scene is available. The selection of the next capture point should consider both the resolving occlusions in the already extracted model and the acquiring additional views of the non-modelled environment. The latter are required to have a sufficient overlapping region between two scans so to aim their integration. Is easy to see that the quality of the final model depends highly from the planning strategy and in particular from the distribution of the viewpoints inside the architecture. Another important thing to consider is that the number of these points, from where the data is acquired, should be minimised to reduce the time needed for a complete scene reconstrucion. These considerations are important also for the points where photograph images are taked. The problem to chose the viewpoints position represent an important phase of the survey, in particular for a complex architecture like this one. Recently have been proposed some algorithms that allows to determine the best viewpoints position considering many

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