Portable and low-cost solutions to the imaging of Paleolithic art objects: A comparison of photogrammetry and reflectance transformation imaging

Porter, Samantha; Huber, Nadine; Hoyer, Christian; Floss, Harald

doi:10.1016/j.jasrep.2016.07.013

Cited by 31 publications

(28 citation statements)

References 4 publications

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“…In Solem et al [40], which was published in the workshop's special issue, the potential of RTI and photogrammetry (in specific, image-based modelling-IBM) is further explored and two new ways of combining RTI and IBM are introduced. While the methods have been combined previously [41][42][43], they have been used separately, for instance, by using RTI to record an inscription and using IBM to record the wall the inscription was inscribed on. The two new ways of combining RTI and IBM that are considered in the paper, are both based on image acquisition and model generation, overlapping images acquired while using the Rigged Light (RL)-RTI technique.…”

Section: Workhop Presentations and Special Issue Papersmentioning

confidence: 99%

Sensing Archaeology in the North: The Use of Non-Destructive Geophysical and Remote Sensing Methods in Archaeology in Scandinavian and North Atlantic Territories

et al. 2020

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In August 2018, a group of experts working with terrestrial/marine geophysics and remote sensing methods to explore archaeological sites in Denmark, Finland, Norway, Scotland and Sweden gathered together for the first time at the Workshop ‘Sensing Archaeology in The North’. The goal was to exchange experiences, discuss challenges, and consider future directions for further developing these methods and strategies for their use in archaeology. After the event, this special journal issue was arranged to publish papers that are based on the workshop presentations, but also to incorporate work that is produced by other researchers in the field. This paper closes the special issue and further aims to provide current state-of-the-art for the methods represented by the workshop. Here, we introduce the aspects that inspired the organisation of the meeting, a summary of the 12 presentations and eight paper contributions, as well as a discussion about the main outcomes of the workshop roundtables, including the production of two searchable databases (online resources and equipment). We conclude with the position that the ‘North’, together with its unique cultural heritage and thriving research community, is at the forefront of good practice in the application and development of sensing methods in archaeological research and management. However, further method development is required, so we claim the support of funding bodies to back research efforts based on testing/experimental studies to: explore unknown survey environments and identify optimal survey conditions, as well as to monitor the preservation of archaeological remains, especially those that are at risk. It is demonstrated that remote sensing and geophysics not only have an important role in the safeguarding of archaeological sites from development and within prehistorical-historical research, but the methods can be especially useful in recording and monitoring the increased impact of climate change on sites in the North.

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Section: Workhop Presentations and Special Issue Papersmentioning

confidence: 99%

Sensing Archaeology in the North: The Use of Non-Destructive Geophysical and Remote Sensing Methods in Archaeology in Scandinavian and North Atlantic Territories

et al. 2020

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“…Newman et al reproduced the surface of bones using a moveable light source (handheld flash) around the object along the surface of a "virtual light dome" [13] defined at a fixed distance from the object. Porter et al [14] developed a portable rig out of PVC sheets consisting of a rotating arm with small flashlight fixed at different heights and angles, and a circular ring to guide the placement of the arm at fixed intervals around the object. Morita et al [15] developed a RTI system where illumination was made by a 168 LED lamp manually operated for small objects or by an halogen lamp for big objects (a column of a cemetery).…”

Section: Electronic Supplementary Materialsmentioning

confidence: 99%

Arduino-controlled Reflectance Transformation Imaging to the study of cultural heritage objects

et al. 2020

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This article examines the development of a low-cost and portable setup controlled by an Arduino board to perform Reflectance Transformation Imaging technique, from the information derived from 45 digital photographs of an object acquired using a stationary camera. The setup consists of 45 high-intensity light emitting diodes (LEDs) distributed over a hemispherical dome of 70 cm in diameter and a digital camera on the top of the dome. The LEDs are controlled by an Arduino board, and the user can individually control the LEDs state (ON or OFF) and duration of illumination. An old manuscript written with iron-gall ink and a set of 1 Euro coins mint in 2002 were photographed with the setup. The interactive re-lighting and the mathematical enhancement of the object's surface revealed corrosion, loss of material, scratches and other details, which were not perceived in standard images. These unique features, which can be extracted using edge detection processing, have immediate application in different fields such as cultural heritage or forensic studies, where they can be used as fingerprints to identify unique objects, allowing also recognizing the use of tools to alter the surface of coins to increase the price in the market.

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“…Applications of terrestrial multi-view image-based modeling and texturing for large-scale heritage applications vary considerably. This technique has been implemented towards high resolution documentation and virtual restoration of small artefacts [8], damaged pottery [9], rock art [10], wall paintings [11] and decorative friezes [12], comprehensive investigations on pre-historic engravings [13], ancient Egyptian coffins [14] and ancient inscriptions [15], and evaluation of damage [16] and restoration works [17] on painted surfaces.…”

Section: Multi-view Image Recordingmentioning

confidence: 99%

Image-based metric heritage modeling in the near-infrared spectrum

Adamopoulos

Bovero

Rinaudo

2020

Preprint

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Digital photogrammetry and spectral imaging are widely used in heritage sciences, towards the comprehensive recording, understanding, and protection of historical artefacts and artworks. The availability of consumer-grade modified cameras for spectral acquisition, as an alternative to expensive multispectral sensors and multi-sensor apparatuses, along with semi-automatic software implementations of Structure-from-Motion (SfM) and Multiple-View-Stereo (MVS) algorithms, has made more feasible than ever the combination of those techniques. In the research presented here, the authors assess image-based modeling from near-infrared (NIR) imagery acquired with modified sensors, with applications on tangible heritage. Three-dimensional meshes, textured with the non-visible data, are produced and evaluated. Specifically, metric evaluations are conducted through extensive comparisons with models produced with high-resolution visible (VIS) spectrum image-based modeling, to check accuracy of results. Furthermore, the authors observe and discuss, when the implemented NIR modeling approach, enhances the preservation of surface detail on the reconstructed spectral models or counteracts certain problems arising from lighting conditions during VIS acquisition. Radiometric properties of the produced results are evaluated on the capacity to enhance observation towards the characterization of surface and under-surface state of preservation, and consequently, to support conservation interventions, in comparison to the respective results in visible spectrum.

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Portable and low-cost solutions to the imaging of Paleolithic art objects: A comparison of photogrammetry and reflectance transformation imaging

Cited by 31 publications

References 4 publications

Sensing Archaeology in the North: The Use of Non-Destructive Geophysical and Remote Sensing Methods in Archaeology in Scandinavian and North Atlantic Territories

Sensing Archaeology in the North: The Use of Non-Destructive Geophysical and Remote Sensing Methods in Archaeology in Scandinavian and North Atlantic Territories

Arduino-controlled Reflectance Transformation Imaging to the study of cultural heritage objects

Image-based metric heritage modeling in the near-infrared spectrum

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