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Communication dans un congrès Année : 2001

Simple photogrammetric methods with arpenteur. 3-d plotting and orthoimage generation: The i-mage process

Résumé

This paper focuses on an original approach to architectural survey whereby the measuring step, driven by an architectural model, is
left to the architect's or the archaeologist's initiative, with reduced participation by the photogrammetric expert. A new set of tools
to this end is available in the Web-based tool ARPENTEUR (Architectural PhotogrammEtry Network Tool for EdUcation and
Research).
Surveys are accomplished with the so-called I-MAGE process (Image processing and Measure Assisted by Geometrical primitive)
which enables the user, for instance, to obtain 3-D measurements while digitising a single image with "no loss" of accuracy. IMAGE
is a new measuring method for digitising 3-D points, based on the coupling of image correlation and the expected shape of
objects. Shapes are primitive surfaces or partial surfaces like planes, cylinders, cones and spheres. We have developed the I-MAGE
process to assist the plotting phase: the homologous point is determined by the system using both the image orientation and the
geometrical primitive computed on a set of 3D points already measured.
On the other hand, so far, accuracy has not always been the principal purpose of surveys in archaeology and architecture. Each
photograph contains a tremendous amount of qualitative information which is not often used to its full potential. We suggest,
therefore, the full use of all the information made available during the photogrammetric process, such as: camera orientation results,
3-D primitive surface computation, and rectification or projection of the images onto the primitives. The result is a scaled image
containing all of the qualitative information. Accuracy is then a consequence of the hypothesis made when nearing the real surface
with a primitive. We present as an example an orthoimage generation from a rubbed vault (estimated with a cylindrical primitive) at
the frigidarium in the Thermes de Cluny, at the Museum of the Middle-Ages, Paris.
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Dates et versions

halshs-00277064, version 1 (21-05-2008)

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  • HAL Id : halshs-00277064 , version 1

Citer

Pierre Drap, Pierre Grussenmeyer, Gilles Gaillard. Simple photogrammetric methods with arpenteur. 3-d plotting and orthoimage generation: The i-mage process. CIPA 2001, 2001, Germany. pp.47-54. ⟨halshs-00277064⟩
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