A metrological approach for multispectral photogrammetry

Sebar, Leila Es; Lombardo, Luca; Parvis, Marco; Angelini, Emma Paola Maria Virginia; Re, Alessandro; Grassini, Sabrina

doi:10.21014/acta_imeko.v10i4.1194

Cited by 11 publications

(5 citation statements)

References 10 publications

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“…Various techniques are available for generating RTI, such as using a fixed dome [21] or motorized rotating arcs for light positioning, as well as the adoption of photogrammetry; while extensively applied in the large-scale digitization of museum artifacts [33], the latter is also useful for metrology validation [34,35] and multiband analysis [4].…”

Section: V-rti: Data Acquisitionmentioning

confidence: 99%

The Use of Virtual Reflectance Transformation Imaging (V-RTI) in the Field of Cultural Heritage: Approaching the Materiality of an Ancient Egyptian Rock-Cut Chapel

Di Iorio,

Es Sebar,

Croci

et al. 2024

Applied Sciences

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Recent progress in the realm of imaging technologies has swiftly disseminated fresh methodologies for representing objects, broadening the horizons for scholars such as art historians, archaeologists, conservators, and conservation scientists. Reflectance Transformation Imaging (RTI) and three-dimensional (3D) modeling via Structure from Motion (SfM) have rapidly gained popularity and are being employed by a wide range of users, expanding the possibilities for understanding objects of material cultural heritage from different perspectives. This paper explores the outcomes achieved through the application of these techniques to gain deeper insights into the surface of a bas-relief within a confined space. This methodology enhanced our understanding of the original sandstone surfaces of the bas-relief by integrating RTI and 3D visualization, thereby acquiring a novel investigative tool with enhanced illumination possibilities. A data fusion approach is proposed using photogrammetry to produce a Virtual RTI (V-RTI). In the case study reported in this paper, focusing on one inner wall of the chapel of Ellesiya at the Museo Egizio of Turin, V-RTI was employed to obtain useful surface information in a context where conventional RTI would have been impossible to achieve. Finally, the study compares the different techniques through direct qualitative and quantitative analysis, highlighting possible future developments from both instrumental and methodological points of view.

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Section: V-rti: Data Acquisitionmentioning

confidence: 99%

The Use of Virtual Reflectance Transformation Imaging (V-RTI) in the Field of Cultural Heritage: Approaching the Materiality of an Ancient Egyptian Rock-Cut Chapel

Di Iorio,

Es Sebar,

Croci

et al. 2024

Applied Sciences

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“…As a first case study, the Author developed an ultra-low-cost DAQ board using only a Teensy 3.6 Board and few passive external components, as it is shown in Figure 2. The board can be proposed for possible applications in different fields, such as the development of generic acquisition of analogue signals, impedance measurements, environmental and structural monitoring, corrosion protection also in the cultural heritage field, motor control for movable equipment and biomedical applications [13]- [16].…”

Section: Teenydaq Board Without External Adcmentioning

confidence: 99%

Multi-platform solution for data acquisition

Lombardo

2023

Acta IMEKO

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Analogue data acquisition is a common task which has application in several fields such as scientific research, industry, food production, safety, and environmental monitoring. It can be carried out either using systems designed ad-hoc for a specific application or by using general-purpose Digital Acquisition Boards (DAQ). Several DAQ solutions are nowadays available on the market, however, most of them are extremely expensive and come as commercial closed products, a factor which prevents users to adapt the system to their specific applications and limits the product compatibility to few operating systems or platforms. This paper describes the design and the preliminary metrological characterization of a digital data acquisition solution based on the Teensyduino Development Board. The aim of the project is to create a hardware and software infrastructure suitable to be employed on several operating systems and that can be freely modified by the users when required. Teensyduino board is a well-known development platform which is characterized by high computing performance and USB support. Taking advantage of the Teensyduino features, the proposed system is easy to be calibrated and used, and it provides functions and performance comparable to many commercial DAQs, but at a significantly lower cost.

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“…Multiple methods exist for creating RTIs, including the use of fixed domes [7] or motorized rotating arcs for light placement as well as the implementation of photogrammetry, largely used in massive digitization of museum assets [8], as well as for metrology validation [9] [10] and multispectral analysis [11]. The workflow presented here involves four steps: photographic acquisition, photogrammetry, rendering, and V-RTI reconstruction.…”

Section: The V-rti Workflowmentioning

confidence: 99%

An improved methodology for extending the applicability of Reflectance Transformation Imaging to confined sites

Di Iorio,

Es Sebar,

Lombardo

et al. 2023

Proceedings of the 2022 IMEKO TC4 International Conference on Metrology for Archaeology and Cultural Heritage

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Recent advances in the field of imaging technologies rapidly spread new methods of representing cultural heritage, expanding the possibilities for art historians, archaeologists, conservators and conservation scientists. In this regard, Reflectance Transformation Imaging (RTI) and three-dimensional (3D) modeling using close-range photogrammetry have become rapidly common and widely used by an heterogeneous public, multiplying the possibilities of understanding artworks from different points of view. This paper discusses the results that were achieved by applying these techniques to better understand the surface of a basrelief owned by the Museo Egizio of Turin (Italy) in a confined site. We were able to successfully enhance the volume of engravings by integrating both RTI and 3D visualization to obtain a new investigation tool with a more suitable illumination.

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A metrological approach for multispectral photogrammetry

Cited by 11 publications

References 10 publications

The Use of Virtual Reflectance Transformation Imaging (V-RTI) in the Field of Cultural Heritage: Approaching the Materiality of an Ancient Egyptian Rock-Cut Chapel

The Use of Virtual Reflectance Transformation Imaging (V-RTI) in the Field of Cultural Heritage: Approaching the Materiality of an Ancient Egyptian Rock-Cut Chapel

Multi-platform solution for data acquisition

An improved methodology for extending the applicability of Reflectance Transformation Imaging to confined sites

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