Branch of the solid photogrammetry that consists in the restitution from photographs of 3D dense point cloud and/or textured mesh models, using the principles of projective geometry. The first algorithm of automatic recognition of features (homologous points in multiple photographic images with different perspectives) dates back to 1999. It can be performed using commercial or freeware software, on oneself computer or by cloud computing. The workflows includes recognition of features, photo matching, orientation, dense matching (and polygonal reconstruction & texture mapping). One of its output is the orthophoto.
Published in Chapter:
Integrated Survey of “Quadrature” Aimed at the Graphical Analysis of Painted Perspective: Trompe l'Oeil Architecture, Palazzo Arese Borromeo
Donatella Bontempi (University of Parma, Italy) and Giorgia Bianchi (University of Parma, Italy)
Copyright: © 2017
|Pages: 35
DOI: 10.4018/978-1-5225-0680-5.ch016
Abstract
The issue of knowledge and documentation of cultural heritage is always central in the field of Drawing, which, through the survey, is always preliminary to the safeguarding and valorisation of artistic and architectural heritage. The paper aims at presenting some results of a survey realized following an approach that mix direct, laser and photographic techniques to obtain high quality ortophotos of the painted surfaces, useful to be the basis for the graphical analysis of the trompe l'oeil perspective. The phases are: survey campaign and data acquisition, postproduction of the RAW file, photo straightening, photo modelling, orthophoto output, CAD analysis, conclusive considerations. All these steps are referred to the experimentation on a concrete case study, one of the numerous frescoed rooms belonging to the rich iconography of Palazzo Arese Borromeo in Cesano Maderno (MB, Italy), a building that is an actual unicum in its kind.