Leonardo Baglioni

Architectural Perspectives Survey

This paper deals with the problem of surveying Architectural Perspectives, generally painted in a 1:1 scale, which represent illusory spaces, enlarging the hosting real spaces. In particular, we intend to propose a method of survey, applicable to the case of painted surfaces in general; this method allows us to achieve high-resolution images with a large information content that gives us detailed information on the colours and on the painting construction signs, in addition to the metric data. For this purpose, we tested image-based integrated survey techniques, which aim, on the one hand, at the construction of three-dimensional virtual models through consolidated image-based modelling techniques, on the other at the construction of high resolution images that have metric valence.

A Contribution to the History of Representation. The Unpublished Treatise by Matteo Zaccolini

The unpublished treatise by Matteo Zaccolini, Teatin father, painter and teacher of perspective, was composed in Rome in the first quarter of the seventeenth century and is composed by four books. The fourth book, entitled “The delineation of the shadow produced by opaque rectilinear bodies above the flat surface”, is dedicated to the projection of the shadows in perspective representation and is the most interesting for the history of scientific representation as it collects a vast catalogue of examples in which prismatic bodies project shadows on variously oriented flat surfaces, cylinders, cones and spheres. The projection of shadows produced by extended and multiple light sources and the knowledge of conic curves as planar sections of quadratic surfaces is also addressed. The graphic equipment is rich and characterized by the double draft of each drawing: the first version, drafted only by the shape’s outline, shows all the construction lines; the second version, characterized by the chiaroscuro, hasn’t any construction lines. The in-depth critical analisys of the volume allowed to give Zaccolini back a significant role in the panorama of the history of the science of representation in reference to the study of shadows in the perspective projection.

Architectural Perspectives survey

This paper presents an automatic methodology capable of registering non-overlapping laser scans based on a bundle block adjustment for the orientation estimation of synthetic images generated from the 3D data and camera images using a Structure-from-Motion (SfM) method. Adding camera images to the registration of the generated images can improve the block geometry. The SfM process provides accurate image orientations and sparse point clouds, initially in an arbitrary model space. This enables an implicit determination of the 3D-to-3D correspondences between the sparse points and the laser data then, the Helmert transformation is introduced and its parameters are computed. This results in registering the non-overlapping scans, since the relative orientations between the generated images are determined at the SfM step and transformed to the absolute coordinate system directly. The proposed approach was tested on real case studies and experimental results are shown to demonstrate the effectiveness of the presented method.