Photography-based techniques cover a wide range of topics: animation, inverse lighting, light field rendering, layered depth images, etc. The acronym SfM indicates modelling techniques through automatized algorithms that use the principles of solid photogrammetry to process photographic datasets shot by moving the camera, and are able to return a dense point cloud, sometimes a textured mesh, of the object. From the sequence of frames, the algorithm obtains the parameters of internal and external orientation of the photo taken. Possible to use commercial photo cameras, software are often free.
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.