Fringe projection profilometry for recovering 2.5D shape of ancient coins

Spagnolo, Giuseppe Schirripa; Cozzella, Lorenzo; Leccese, Fabio

doi:10.21014/acta_imeko.v10i1.872

Cited by 3 publications

(3 citation statements)

References 43 publications

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“…For this reason, to reduce the lightning effects a light shield or artificial lighting may be used [16]. The resolution of the camera plays an important role in the crack detection technique [17], [18], and its proper chose is vital for the acquisition system effectiveness. Indeed, a higher resolution can help in record more details, but on the other side it increases the cost, the required memory, the computational burden.…”

Section: A Image Processingmentioning

confidence: 99%

Detection and Classification of Crack for Heritage Building

Sayyaf¹,

Carnì²,

Lamonaca³

2023

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

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Detection, and classification of cracks in buildings are vital to prevent damage and their sudden collapse. This is particularly important to preserve our cultural heritage and save human life. Nowadays, trained operators perform these operations. Consequently, the number of buildings under monitoring is too low and costs are high. Besides the fact that the accuracy and as a consequence the reliability of the inspection results depend on the human operator expertise. For this reason, literature has proposed the implementation of distributed monitoring systems that automatically detect and classify cracks. In this paper, a critical overview of the existent systems and research activities is presented by stressing the metrological challenges.

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Section: A Image Processingmentioning

confidence: 99%

Detection and Classification of Crack for Heritage Building

Sayyaf¹,

Carnì²,

Lamonaca³

2023

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

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“…This approach allowed for the creation of 3D models including the coin edges. Schirripa Spagnolo et al [21] proposed a low-cost fringe projection profilometry, based on a digital micro-mirror device to generate flexible structured-light patterns, for the surface acquisition of the coins. Fusion of data, obtained with more than one acquisition system at diverse scales and spatial resolutions, proves to be effective with coins, yet, this might not solve the problem of specular reflections or dark areas' measurement [22].…”

Section: Introductionmentioning

confidence: 99%

3D scanning of daguerreotypes

Quintero Balbas,

Pezzati,

Cattaneo

et al. 2024

J. Phys. Photonics

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Daguerreotypes are historical photographic images made on mirror-like metallic plates. These are heritage objects whose shape cannot be measured with invasive techniques, like contact probes, but the high reflectivity of their surfaces makes the use of non-invasive, 3D-measuring optical techniques challenging. Moreover, the dark areas resulting from their degradation produce a very high contrast, which add extra difficulties to their measurement.In the last few years, several strategies have been developed to overcome the limitations of optical techniques when measuring reflective metallic surfaces. Many of these solutions are not applicable to the study of cultural heritage artifacts, as they are invasive. We attempted the use of conoscopic holography in a 3D-scanning system using a double-exposure strategy.This is a promising option for 3D measuring of daguerreotypes, as we experimentally demonstrated in this work. We present the results obtained from the analyses of two 19th-century daguerreotypes with different superficial conditions. The double-exposure allowed us to obtain high-quality data from the entire object surface. This enabled the measurement of micro-scale details related to the manufacturing process and/or to the corrosion deposits. The proposed methodology can be exploited to monitor the overall health of highly reflective metallic objects but also the outcomes of some conservation treatments, such as cleaning.

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“…The time is calculated, then multiplied by the speed of light in air, and divided it by two to get the distance. Structure from motion SFM [4] or stereo vision (accuracy for the 3D scanner is 5 -1 cm) [5] and structured-light SL (accuracy for the 3D scanner is 100 -10 m) [6,7]. SL is a very popular non-contact 3D shape measurement technique with the advantages in terms of high measurement accuracy, high point density, high speed, and low cost.…”

Section: Introductionmentioning

confidence: 99%

3D measurement using fringe projection profilometry

Alkhatib,

Shmelev,

Tyshova

et al. 2023

Computer Optics

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This work is devoted to measuring the depth of the 3D object using the structured light method, in particular, phase shift profilometry. Theoretical studies on the methods of three-dimensional measurement systems and fringe projection profilometry are presented. The phase shift profilometry method with an improved calculation of the frequency of sinusoidal patterns is applied. In practical implementation in the environment (20 cm × 30 cm), the algorithm is tested on a stepped object consisting of eight steps with a difference of 150 mm between two successive steps. In this case, the achievable error for measuring such an object is 20 mm. Our method has great potential in industrial applications where the measurement of the smoothing of the surface of the object is needed to find the defect in the surface with high accuracy without contacting the object.

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Fringe projection profilometry for recovering 2.5D shape of ancient coins

Cited by 3 publications

References 43 publications

Detection and Classification of Crack for Heritage Building

Detection and Classification of Crack for Heritage Building

3D scanning of daguerreotypes

3D measurement using fringe projection profilometry

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