Restoration of an 18th century frame: 3D modelling, printing and matching color of decorative flowers elements

Abstract

This paper describes the application of 3D digital technology to support the rebuild of lost decorative elements of an historical frame. The frame belongs to an 18th century painting depicting the portrait of D. José, Prince of Brazil, displayed at the National Palace of Queluz, Portugal. The application of digital technologies has been planned from the very beginning in order to avoid the traditional use of silicone in the reproduction of missing elements. The photogrammetric 3D acquisition, a non-contact methodology, has been used to reduce the manipulation and hence prevent further degradation of the artistic object. Following the 3D modelling operation, new decorative elements were made using an additive printing technology. In the final phase of the work, the post-printing treatment was carried out, in which aqueous products were used. 3D modelling, in addition to facilitate the restoration treatment of the historic frame, can also be useful in the creation of a digital collection of decorative frame elements, i.e. a virtual database.

Photogrammetric state of degradation assessment of decorative claddings: the plasterwork of the Maidens' Courtyard (The Royal Alcazar of Seville)

“…The use of these digitalized data for applications related to reverse engineering is added to all the applications already mentioned (Fatuzzo, Sequenzia, & Oliveri, 2016;Sequenzia, Fatuzzo, & Oliveri, 2021). Digital photogrammetric surveys and also the data acquired by the use of handheld scans are so accurate that they permit the recreation and replacement of lost fragments using 3D printing techniques, or the manufacture of moulds to reproduce replicas at different scales (Henriques, Bailão, Rocha, & Costa, 2020;Merchán, Merchán, Salamanca, Pérez, & Nogales, 2019). Thus, this technique is ideal for generating extensive databases of 3D elements which classify existing details in different plasterworks located in different places.…”

Modelado 3D de la muralla de la Macarena (Sevilla). Propuesta metodológica para su integración en trabajos de gestión cartográfica digital

“…For the development of this work, photogrammetry technique has been chosen for the data acquisition. The main advantage of this technique over the use of laser scanners is its portability, low cost and the quality of the obtained textures (Henriques et al 2020). Thanks to the advances in computer vision techniques, algorithms based on image processing have become more competitive for cloud of points generation.…”

“…Para el desarrollo de este trabajo se ha optado por la toma de datos a partir de fotogrametría. La mayor ventaja que presenta esta técnica frente al uso de escáner láser es la portabilidad, el bajo coste y la calidad de las texturas obtenidas en el modelo 3D (Henriques et al 2020). Gracias a los avances en las técnicas de visión artificial, los algoritmos basados en el procesamiento de imágenes se han vuelto más competitivos para la generación de nubes de puntos.…”

Application of 3D technologies for museum reproductions: the skull of Homo naledi from the MNCN

“…Con el estudio de la pieza digitalizada y la exposición de la réplica se salvaguarda la pieza original en adecuadas condiciones de conservación y se evita su manipulación. Este tipo de planteamientos están siendo puestos en práctica en la conservación de bienes culturales frágiles, tal y como se indica en algunas investigaciones [8][9][10][11].…”

“…Se aprovecharon al máximo los recursos del Laboratorio de Morfología Virtual del MNCN a la hora de realizar la réplica. En el desarrollo de la metodología de trabajo se tuvieron en cuenta experiencias previas y trabajos científicos relativos al empleo de las tecnologías 3D en la reproducción y reconstrucción física del Patrimonio Cultural, como se ha indicado [11][12][13][14].…”