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:: 3. SOFTWARE

Document type:: Monograph

Structure type:: Chapter

Chapter

Title:: DETAILED 3D RECONSTRUCTION OF MONUMENTS USING MULTIPLE TECHNIQUES. Sabry F. El-Hakim, J.-Angelo Beraldin, Michel Picard

Document type:: Monograph

Structure type:: Chapter

-20- Figure 2. Typical 3D-LS image in 3D Parallel Projection depth information, the 3D-LSs of INS sample the intensity of the backscattered laser light with a 13 bit resolution synchronously. This means, the user obtains grey scaled 3D surface images. Figure 2 shows a typical 3D-LS measurement result in 3D-projection. A more detailed description of 3D-LS is given in Wehr, 1999. The technical data of 3D-LS are compiled in Table 1. Table 1. Technical Data of 3D-LS 2.1 Scanning Patterns Figure 1 depicts that 3D-LS uses two galvanometer scanners which are mounted orthogonally to each other. This setup allows for deflecting the laser beam in two dimensions. In standard setup mode the 3D-LS moves the laser beam in horizontal line over the object's surface (s. Figure 1). However, Figure 3. Digitizing an Object on a Turntable control unit respectively, which is 10 arcsec. In this scanning mode the user obtains a 3D image of one view. When scanning surfaces which are larger than the FOV of 3D-LS, several images must be taken in order to obtain a comprehensive data set. This means that after scanning, the different views must be merged by sophisticated software programs. Taking several views is also required if solid volumes, closed interiors, surfaces and volumes with undercuts are sampled. Surveying procedures and merging will be explained in the preceding chapters. Figure 4. 3D-LS on Turntable frequencies of e.g. 314 MHz resolutions down to the tenth of a millimeter are possible. Knowing the actual laser beam's orientation for each measurement point, three dimensional surface coordinates can be determined (s. Figure 1). Besides the using galvanometer scanner drives it is possible to address randomly points within the field of view (FOV) which is 30°x30° for 3D-LS. These drives are controlled by software. Therefore, it is possible to adapt the scanning pattern to the actual applications. The standard scanning pattern (s. Figure 1), the TV line scan, is normally used to digitize object surfaces. The number of points along the line and the line spacing is also programmable. The minimum spacing is determined by the resolution of the galvanometer scanners and the scanning optical laser power 0,5 mW optical wavelength 670 nm instantaneous field of view IFOV 0,03° (transmitting aperture 3,5 mm) total field of view FOV max. 30°x30° receiving aperture 17 mm standard scanning 2-dim. line scan number of pixels typ. 200x200, 400x400 or 800x800 Pixel max. range <10 m slant ranging accuracy 0,1 mm (for diffuse reflecting targets with 60% reflection at 1 m distance) slant range error ±1 mm (0 < range < 5 m and 50 dB intensity dynamic) side tones 10 MHz and 314 MHz sampling rate 2 kHz (1-side tone), 800 Hz (2-side tones) scanning time for one image with 200x200 pixels 40 s (2-side tones)

Access restriction

Copyright

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

Monograph

Chapter

Chapter

Table of contents

Cite and reuse

Monograph

Chapter

Image

Image fragment

Citation links

Citation recommendation