Frescoed Vaults: Accuracy Controlled Simplified Methodology for Planar Development of Three-Dimensional Textured Models

Abstract

Abstract:In the field of documentation and preservation of cultural heritage, there is keen interest in 3D metric viewing and rendering of architecture for both formal appearance and color. On the other hand, operative steps of restoration interventions still require full-scale, 2D metric surface representations. The transition from 3D to 2D representation, with the related geometric transformations, has not yet been fully formalized for planar development of frescoed vaults. Methodologies proposed so far on this subject provide transitioning from point cloud models to ideal mathematical surfaces and projecting textures using software tools. The methodology used for geometry and texture development in the present work does not require any dedicated software. The different processing steps can be individually checked for any error introduced, which can be then quantified. A direct accuracy check of the planar development of the frescoed surface has been carried out by qualified restorers, yielding a result of 3 mm. The proposed methodology, although requiring further studies to improve automation of the different processing steps, allowed extracting 2D drafts fully usable by operators restoring the vault frescoes.

High Scale 3d Modelling and Orthophoto of Curved Masonries For a Multipurpose Representation, Analysis and Assessment

“…In (Markiewicz et al, 2017;Bevilacqua et al, 2016;Tortosa Garcia et al, 2016;Marinov, 2008;Lerma & Tortosa, 2004) some example of experimental workflow are deeply displayed. Commercial software 3DReshaper (http://www.3dreshaper.com/) and open-source Cloud Compare (http://www.danielgm.net/cc) offers some effective tools to calculate cylindrical and conical projection.…”

“…They must allow the identification of the causes and possible evolution of structural issues (Chiabrando et al, 2017). These topics can be met by methods that allow the measurements of shapes in the space (to detect misalignments, bulging, out-of-plumb, subsidence, depressions in the vaults, soils and ceilings) and high detailed textures, applicable through photogrammetric systems, both to flat surfaces and double curvature surfaces (Bevilacqua et al, 2016;Spano & Vizzini, 2016). Here a test-case was considered since its particular vertical building, subjected to specific structural stresses.…”

Structure from motion (SfM) processing of UAV images and combination with terrestrial laser scanning, applied for a 3D-documentation in a hazardous situation

“…Performance of this technique depends on the image quality and collection mode, as well as lighting conditions and the presence of sharp edges, which could cause some problems in feature detection due to a poor signal-to-noise ratio (Remondino et al 2014;Dandois et al 2015;Tannant 2015;Bevilacqua et al 2016).…”

3d Survey Techniques for the Architectutal Restoration: The Case of St. Agata in Pisa

“…Several advantages are in fact provided (Costantino et al, 2016;D'Urso et al, 2014;Dominici et al;: on one hand, availability of high precision, high quality 3D models is surely promoting development of integrated projects for documentation and digital communication of historic heritage; on the other hand, interesting research scenarios are disclosing as regards optimization of integration systems for digital 3D survey models in the processes of planning, execution and management of * Corresponding author restoration and preservation projects in HBIM (Heritage Building Information Model) environments (Chiabrando et al, 2016). In the field of architectural heritage, use of Terrestrial Laser Scanning (TLS) is to date well-established: its high precision in metric data collection, together with the limited time required for survey completion, makes TLS methodology an increasingly effective alternative to traditional direct surveying methods (Cardaci et al, 2011;Caroti et al, 2015;Caroti et al, 2012;Bevilacqua et al, 2016;Sperafico et al, 2015). The high metric strictness of TLS surveys, however, is not complemented by a matching quality as regards chromatic, and therefore material, information of building surfaces.…”