Process by which a photographic image that takes a foreshortening of a flat surface is distorted according to the rules of projective geometry to correctly and measurably represent the surface itself ( photoplan ). The stitching, merging or mosaicking of more images is a next step of union of several rectified images to have a unique big image of high quality. It may be necessary if the surface is very large and with a single frame would be less detailed, or it is impossible to photograph it entirely due to physical obstacles. Panoramic photos or multi-images are obtained through the seam of images taken in parallel or rotating the camera around the focal point of the lens (sphere). It serves to overcome the limitations of the sensor/lens used.
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.