Laurentiu Marian Angheluta

National Institute for Research and Development in Optoelectronics · Optoelectronic Methods and Techniques for Artwork Restoration Conservation

In this paper we are presenting our approach and workflow for macro photogrammetry as a complementary method for 3D digitization of polychromies on wood support. Macro photogrammetry can be used for detailed documentation of physical damages in painting layers, underlayers or support. For a better presentation of the context, a selection of typical...

This paper details the preparation stages and processes for the digital documentation and virtual reconstruction and restoration hypotheses of a heavily damaged archaeological artefact. The presented workflow starts with the immediate actions after the artefact unearthing, going through physical restoration, 3D digitization, virtual restoration (in...

In this paper is described the method and process for the development of an online 3D viewer dedicated for displaying time lapse series of imaging data fused with the color texture of a 3D digitized surface. For a better understanding of the whole process and requirements for the repeatability of this experiment, the data acquisition and processing...

Complex demands in the field of cultural heritage preservation often require a multidisciplinary approach and substantial volumes of multimodal data integration and management. The conventional approach to tackling these issues revolves around using different H-BIM (historical building information model) solutions. This paper presents a prototype f...

This paper presents the application of a Deep Learning algorithm for a classified accurate detection of different types of physical damages in artwork polychrome surfaces. The algorithm was trained for the automated detection of three classes of typical surface deteriorations: cracks, blisters and detachments (losses). The image sets used in this s...

The paper presents the discovery of a fragmentary iron helmet (23 fragments), during the 1990 archaeological campaign at Capidava (Constanța County). The helmet was found inside the horreum, in a room (an enclosed complex) that ended its functioning during the N2 of Phase IV, in the 580s AD. The intra muros granary (horreum frumentarium) is a three...

The topic of this paper is a Roman cavalry sports helmet, or more specifically two halves of the same item, made out of copper alloy. It is part of a category of highly decorated military equipment, designed for parade or, more precisely, used in equestrian games/processions by cavalrymen of the Roman army. It was discovered in the area of the Isla...

Web-based open-access spectral databases relevant to conservation are nowadays a real necessity for heritage scientists and other heritage-related professionals that work with spectroscopic techniques. Fast and easy access to reliable high-quality databases is amplified by the fact that portable analytical techniques are becoming increasingly more...

This is an original manuscript of an article published by CRC Press in Lasers in the Conservation of Artworks XIII on 3 November 2023 available online: https://doi.org/10.1201/9781003386872-5

Easily accessible characterization techniques such as X-ray fluorescence (XRF), Fourier Transform Infrared Spectroscopy (FTIR), or Raman spectroscopy, are at this moment the most commonly used analytical tools in heritage and conservation science. Materials identification in works of art is a fundamental step for understanding an object's history o...

This paper presents an integrated multi-analytical documentation of a bronze vessel discovered in a 2nd century Roman military fort from ancient Dacia. The process involved 3D digitization, X-ray and hyperspectral imaging, and molecular, elemental, and structural analysis using Fourier Transform infrared spectroscopy, X-ray fluorescence, laser-indu...

This study focuses on the investigation of certain bronze adornment objects from the First Iron Age (the so-called middle Hallstatt period), dating to the ninth–eighth c. BC. These objects are part of a bronze and iron hoard (labeled Cx 116) discovered in the present Romanian territory, at Tărtăria–Podu Tărtăriei vest archaeological site, in Alba C...

This paper presents a detailed comparative study between the two main methods of 3D digitization, photogrammetry and 3D laser scanning, regarding their performances with known difficult materials. For this study were selected two objects that were sculpted in two specific translucid materials: jade and candle wax. These types of materials are parti...

Acest volum este o colecţie de studii interdisciplinare realizate în cadrul proiectului demonstrativ „Platformă digitală integrată pentru valorizarea peisajului cultural din Munţii Buzăului. Studiu de caz: cadrul natural şi monumentele istorice din zona Aluniş-Bozioru”, derulat în perioada ianuarie 2017 - iunie 2018. Principalul obiectiv al proie...

The current advances in computer science and digital photography technology are directly contributing to the computing speed and work volume in digital photogrammetry, making this method a competitive rival with any other modern 3D scanning technology. Today’s photogrammetry performance is the result of the hard work and innovation of many brillian...

This paper presents an optimized approach for the characterization of complex painting layers and for the evaluation of previous interventions on artworks. Focusing on the capabilities of hyperspectral imaging, which combines spectral and imaging data, this specific approach reflects also the importance of complementary methods and techniques, whic...

In this paper we are synthesizing several aspects of the trend of multi- and inter-disciplinary strategies regarding both research and applications in the scientific documentation and conservation status monitoring of cultural heritage assets such as museum items, monuments, archaeological sites or even larger cultural landscapes, using modern tech...

This paper describes an experiment regarding the efficiency of the 3D reconstruction from multiple angles 2D X-ray radiographs of cultural heritage artifacts of different volumes and complexities. The goal of the study was to try of reconstruct 3D models of the said artefacts without any setup adjustment or complex targeting system. Using a fixed X...

Four icons belonging to the altarpiece of an old wooden church in Alba county (Romania) were analyzed by means of Fourier transform infrared spectroscopy (FTIR), X-ray fluorescence (XRF), Laser-induced breakdown spectroscopy (LIBS), hyperspectral imaging and X-ray radiography. The icons dated to the beginning of the 18th century are prominent examp...

Almost as old as photography, photogrammetry is still evolving today along with the great developments in hardware technology and software algorithm efficiency. Now we are witnessing the development of real-time basic 3D reconstruction and motion tracking in video-gaming industry (Microsoft’s Kinect sensor) or online 3D reconstruction for design pu...

This paper presents an optimized approach for the characterization of complex painting layers and for the evaluation of previous interventions on artworks. Focusing on the capabilities of hyperspectral imaging, which combines spectral and imaging data, this specific approach reflects also the importance of complementary methods and techniques, whic...

This paper presents the methodology and the results of the implementation of an interdisciplinary research model regarding the characterization of a cultural landscape. This work was focused on 5 rupestral monuments in the Buzău Mountains and is part of a demonstrative project funded by the Program Partnerships in Priority domains PN-III-P2-2.1. I...

This paper presents an ongoing work within a national project regarding the scientific investigation of one of the most important archaeological sites in Romania: Ulpia Traiana Sarmizegetusa. Although the project has many objectives, in this paper we will focus on the development work of a virtual archaeodrome for the archaeological park. In this r...

This paper presents a newly started demonstrative project regarding the implementation and validation of an interdisciplinary research model for the Aluniș-Bozioru (Romania) cultural landscape, with the development of an online interactive digital product. This digital product would provide complementary data about the historical monuments and thei...

This paper describes a project aimed to demonstrate the great potential of photogrammetry in realizing a detailed 3D digital model of an old Romanian traditional decorative textile piece, from a valuable collection, for 3D printing purposes. The challenge was to record with high precision the planar textile surface and then process the digital repl...

The paper is divided in two parts, first part presents how the propagation of electromagnetic wave is influenced by the local condition of the propagation medium, in our case the soil, and by the central frequency of the transmitter antenna. The second part contains the results of a GPR survey on an archaeological site from Malaiesti, Prahova Count...

The present paper presents the results of a national project - Folkmedia - focused on a new form of a modern archive according to a strict risk assessment plan, in order to assure the collection's viability and increase its visibility. Significant part of the archive recordings has been successfully assessed and the digitization process is running...

This paper describes the good practice demonstrations and results of an open restoration site organized at Tismana Monastery, Gorj County. For about two weeks an interdisciplinary team consisted in student restorers and research scientists joined their efforts to apply and demonstrate a model of good practice in modern restoration. This model is ba...

This paper describes an online instrument with multiple purposes developed to complement the functionality of a mobile laboratory employed in the field of Conservation – Restoration of Cultural Heritage. The instrument was developed as a web-based platform using common web design technologies. The platform can be used for the online access to infra...

The current paper presents the results obtained during the first application of an original platform that grants real-time access to a variety of users to in situ studies and campaigns, opening an online door-way for national and international cooperation. The techniques selected for the investigation and cleaning of the monument - target of the st...

In this paper it is presented a visualization method for the investigation data obtained on the surfaces of the artworks. This method delivers a series of visual data, in digital format, associated with a digital three dimensional replica of the investigated surface. The way of visualizing this kind of model is an interactive virtual world environm...

As in any other field of activity and research, the Conservation-Restoration of monuments and artworks field has benefitted from the continuous advances in science, especially for the investigation and monitoring techniques. The recent developments in the information technology have also improved the means and precision of studying and preserving t...

The paper was generated by the identified needs for improved conservation strategy and long life professional training, particularly for science conservators, art historians, restorers and conservators, and equally contributes to: i) new education instruments for on-line access to advances research infrastructure; ii) real-time monitoring of in sit...

In această lucrare este prezentată o platformă de teleoperare prin Internet pentru un dispozitiv de investigare a fluorescenţei induse cu fascicul laser, utilizat în investigarea suprafetelor pictate ale operelor de arta. Partea hardware a sistemului este alcatuită din dispozitivul de investigare transportabil şi un calculator personal utilizat ca...

This paper proposes an editing protocol for artwork investigation & diagnosis workflow that will allow the art restorers to obtain, using photonic devices, a digital data model that includes a complex physical and chemical characterization, key information for conservation status appreciation. Based on the investigation-monitoring at certain parame...

In this paper we present an approach based on mathematical and computing aspects of a method for the correlation of images representing investigation results over the same area of an object. The aim of this algorithm is to associate the results with a three-dimensional digital model of the investigated surface in an accurate manner. Thus a digital...

This paper presents a study regarding the quality of particular painting techniques - grisaille, black and white colors on thick paper, in case of an about 200 years old artwork, using exclusively two analytical laser techniques: Laser Induced Fluorescence (LIF) and Laser Induced Breakdown Spectroscopy (LIBS). The investigation aimed the identifica...

Stain discrimination is very important in a safe and precise cleaning of the affected artworks. With this aim we used an innovative, non-invasive and non-destructive technique: laser induced fluorescence spectroscopy.

Laser cleaning of organic materials such as leather & parchment is a novel technique that has the potential to provide contactless, chemical-free cleaning of historically important documents. This paper presents the restoration and investigation process of an historical parchment, using non-invasive and non contact laser based methods.

The paper presents a mobile laboratory that corroborates advanced photonic techniques for investigation-diagnosis-intervention on artworks, historical buildings and sites. Due to a flawless flexible structure design, It substantially improves the decision and work conditions. It allows complex intervention without risks and - very important - with...

The aim of this paper is to describe the construction of an automated scanning device that uses the LIF invesitgation method, and to verify its operation and efficiency in the particular study case of an historical parchment.

This paper presents a complex portable photonic setup that exploits LIF advantages for biological contamination control of a surface and a case study that validates the investigation procedure. Based on LIF method the necessary information for microbiological species discrimination is collected from distance in real-time, without mechanical contact...

This paper presents a complex portable photonic setup that exploits LIF advantages for biological contamination control of a surface and a case study that validates the investigation procedure. Based on LIF method the necessary information for microbiological species discrimination is collected from distance in real-time, without mechanical contact...