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:: 1. INSTRUMENTS AND METHODS

Document type:: Monograph

Structure type:: Chapter

Chapter

Title:: 3D-RECONSTRUCTION & RE-PRODUCTION IN ARCHAEOLOGY. M. Ioannides, A. Wehr

Document type:: Monograph

Structure type:: Chapter

-21- Sampling axially symmetric solids, like vases, cups etc. which should be described as volumes may be digitize by mounting the object on turntable and using a vertical line scan (s. Figure 3). After each line scan the turntable is moved by a defined angular step. Turntable and 3D-LS are controlled by the same computer. The setup turntable and laser scanner must be well calibrated as well as the exact orientation between the coordinate systems of the turntable and the laser scanner must be known. When scanning extended concave surfaces across a hemisphere like vaults or interiors of rooms, a setup depicted in Figure 4 is of advantage. Here the 3D-LS is mounted on a turntable and a vertical line scan is applied. After each line scan the turntable is Figure 5. Scanning Interior Rooms (one belt) moved by a certain angular step in azimuth. After a turn of 360° a belt with a vertical FOV of 30° is sampled (s. Figure 5). To obtain a hemispherical coverage the 3D-LS must be moved in elevation. This is carried out by an additional stepping motor drive (s. Figure 4). For nadir an image scan is advisable. These selected examples make clear that the optimum scanning pattern is very dependent on the applications and commercially available laser scanners are limited to one scanning pattern realized by optimally designed opto-mechanically setup; e.g. the Cyrax 2500 of the company CYRA features a two- dimensional line scan where as the LMS-Z210 of the RIEGL company carries out a vertical line scan. The 3D-LS of the INS was developed for scientific studies, to derive critical design parameters for the optimization of future laser scanners and measurement procedures. Figure 6. Glass Head neighboring caves were scanned with the setup shown in Figure 5. The rooms had a quadratic plan form of 7.2 m x 7.2 m. The maximum height was 4.35 m. The vertical laser line comprises 40 measurement points. The 360° in azimuth were subdivided in 500 steps. Seven belts were scanned with elevation angles of 0°, 9°, 22°, 36°, 49°, 63° and 76°. At the nadir a complete image of 200x200 points were taken. One cave was surveyed in 1.5 hours. The data sets of both caves were sampled independently. The data sets were merged using identical points Figure 7. 3D-Projection of Caves in both sets and adjustment methods. This was possible, because the two rooms were connected by a door. Figure 7 shows a look from the outside. The survey comprises 360000 points. 3.3 Using the Imaging Scanning Pattern 3. SURVEYS WITH 3D-LS With regard to the different scanner setups typical surveys will be presented and discussed. 3.1 Object on a Turntable Figure 6 shows the digitization result of a glass head. As the scanner did not sample information on the top of the head the solid was not surveyed comprehensively. However, most of the object can be described by a well ordered point cloud directly after the survey. This means the data were sampled volume oriented. Two typical examples for using the imaging scanning pattern will be regarded. First a copy of a relief from the famous master builder Schinkel with the dimensions width 80 cm, height Figure 8. Relief 3.2 Digitizing of Rooms In the historical "Maerzenbierkeller" in Polling, Bavaria (Germany), which was built in 1745/46 by Michael Fischer, two 40 cm and depth 9 cm was scanned at the "Bauhof' in Berlin. Germany. The relief exhibits some undercuts. Therefore, two views must be taken with the 3D-LS. The final result of the

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