par Schenkel, Arnaud ;Ercek, Rudy ;Debeir, Olivier
Référence CHNT23 23th Conference on Cultural Heritage and New Technologies(Nov. 2018: Vienna, Austria), Proceedings of the 23th International Conference on Cultural Heritage and New Technologies 2018 (CHNT023, 2018)
Publication Publié, 2020-01-08
Publication dans des actes
Résumé : In order to make the architectural and archaeological study, the roofs, the courtyard and the facades of the Brussels City Hall were digitized with a 3D scanner, coupled with photographic acquisitions. Various elements, such as the main portal tympanum and the archangel Michael, – an exceptionally preserved 5-metre-high medieval metal wind vane that adorned the top of the 96-metre-high tower –, were also digitized in high definition. Numerical surveys shows different colorimetric (variation of colorimetry related to the changes in natural lighting) and geometric defects (erroneous points related to the passages of persons and vehicles, flying points or noises inherent to the acquisition device). A specific and automatic processing pipeline has therefore been developed and applied to correct all this problems. Given the amount of data and operations for creating plans, a software has been developed to present the data as an enriched 2D representation. This is similar to orthophotos complemented by the possibility to navigate in the depth and to vary the rendering mode (color, intensity, orientation ...), to highlight elements (surfaces, edges ...) hardly visible in simple color mode of rendering. Its functionalities allowed the drawing of very precise elevations and to generate projection images in high definition of all buildings parts and also of the archangel statue. Indeed, this survey allowed to draw the entire statue to the real scale and in a completely proportioned way. Archeologists have been able to distinguish the main work components, and they better understand the articulations between its constitutive parts and the various transformations made to the metal statue over the centuries.