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

Böhler, Wolfgang

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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

Cover

Document type:: Monograph

Structure type:: Cover

- 73 - USING OF LASER AND DIGITAL CAMERA BASED SYSTEMS FOR 3D OBJECT DOCUMENTATION K.Pavelka Czech Technical University in Prague, Faculty of Civil Engineering, Dept. Mapping and Cartography, Laboratory of Photogrammetry, Thäkurova 7, 166 09, Prague 6, Czech Republic Tel.:+42024354951, Fax:+42024310774, E-mail: pavelka@fsv.cvut.cz Commission CIPA, WG 6 KEY WORDS: digital photogrammetry, 3D documentation, laser scanning ABSTRACT: Examples of systems based on simple digital camera and laser are discussed in the paper. At the Czech Technical University in Prague, photogrammetric measurement is performed in the Laboratory of Photogrammetry (Faculty of Civil Engineering). Based on a grant of the Czech Grant Agency, a large project on historical monument documentation and presentation by using a new digital technology has been started. In the framework of co-operation between the Laboratory of Photogrammetry and the Laboratory of Quantitative Methods of Monuments Research (Faculty of Nuclear Physics and Physical Engineering), new methods of 3D objects documentation as a part of project are tested. Two devices for 3D object co-ordinates capturing are being developed at present. The first device uses a rotating platform developed for small objects, a laser for point or profile marking (on the object) and a digital camera (for image sequence saving) on theodolite. Such a 3D scanner can be used for small compact objects, such as small sculptures, vessels, models and so on. The second device uses rotating stabile base equipped with a digital camera and a laser for point marking. This type is suitable for profiling of tunnels for example. The expected outputs are not only the 3D co-ordinates of the object, but also the experience with a new technology based on using laser and automatic image processing. 1. NEW DEVICES FOR 3D OBJECT MEASURING In the framework of co-operation between the Laboratory of Photogrammetry and the Laboratory of Quantitative Methods of Monuments Research (Faculty of Nuclear Physics and Physical Engineering), new methods of 3D objects documentation as a part of project are tested. Two devices for 3D object co ordinates capturing are being developed at present. The aim of the project is to develop a small inexpensive device for special purposes of 3D documentation. By combining several electronic parts such as CCD camera, laser marker, computer and distance measuring device a new laser sensor has been developed. There are only few possibilities how to construct laser based 3D sensors. The principle of these devices is the same: the laser beam is used as an object point marker (single point or line on object) and the laser track is recorded by using of a small CCD camera. The camera and laser position are convergent to the object, 3D co-ordinates can be computed from laser-camera basis. 2. LASER SYSTEM WITH ROTATING PLATFORM For small objects such as small sculptures, vessels or models a system with rotating platform has been constructed. A laser beam optically modified to a thin line on the object is recorded from a basis with CCD camera. A maximum of 25 frames per second can be used. The measured object is situated on a rotating platform with a possibility to change the rotating velocity. All the images are stored on a PC and processed by using of special software. From the image coordinates of marked object points the real 3D coordinates are computed. The scanning process is demonstrated on Fig. 1. i Fig. 1 : Rotating platform system

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