Automated full-3D shape measurement of cultural heritage objects

Sitnik, Robert; Karaszewski, Maciej; Załuski, Wojciech; Bolewicki, Paweł

doi:10.1117/12.828004

Cited by 6 publications

(5 citation statements)

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“…These established registration methods are based on rather dense and low-noise 3D point clouds, which possibly also should be meshed. 3D digitisation in cultural heritage was performed by Guidi, Beraldin and Atzeni (2004), Guidi, Frischer and Spinetti (2005), Sitnik, Karaszewski, Zaluski and Bolewicki (2009). For virtual reality (VR) display Burdea and Coiffet (2003) describe that a further significant reduction in mesh size is required to allow interactive display within the memory requirements of standard PCs.…”

Section: D Data Fusion and Visualisationmentioning

confidence: 99%

Prognosis of Structural and Materials Health in Heritage Conservation

Groves

2016

PHME_CONF

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Immovable 3D cultural heritage objects are an important part of the history and culture in Europe and provide a tangible connection with the past for current societies. These objects comprise religious buildings, castles and fortified buildings, palaces and historic houses, as well as engineering structures such as bridges and waterways. In many cases the buildings contain historic objects, including paintings, furniture, household items, as well as personal items such as jewellery and clothes. The structure of these buildings must be maintained to preserve both the building itself but also its contents. Cultural heritage objects are exposed to weather, changing climate, deterioration of materials, e.g. corrosion, moisture ingress, biological attack, pollution, wear and tear by use and sometimes vandalism. One of the challenges for heritage conservation is to combine the current detailed knowledge with an holistic approach to assessing the overall condition of the object. These parameters are necessarily subjective and comprise deterioration that causes a visual impact on the object, loss of function or loss of authenticity. This requires an interdisciplinary approach comprising the expertise of conservators, scientists, engineers and working in combination with stakeholders such as owners of heritage objects, local authorities and the public. This paper proposes the use of spatial referencing of chemical, biological and structural damage functions to enhance the prognosis capability in heritage science. The current situation is that these individual damage functions are either assessed separately or combined in an ad hoc way. The paper contains an example of immovable cultural heritage at risk in Europe, scientific approaches for the measurement and prognosis of chemical, biological, climate-related and structural damage, together with analysis tools to identify spatial regions with multiple degradation process indicators present.

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Section: D Data Fusion and Visualisationmentioning

confidence: 99%

Prognosis of Structural and Materials Health in Heritage Conservation

Groves

2016

PHME_CONF

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“…Several methods have been described for performing shape measurements with various classes of objects (Pavlidis, 2007). 3D scanners have already been used for high resolution measurements based on the structured light projection method in the field of cultural heritage investigation (Sitnik, 2009). Compared to different methods of shape digitization structured light projection using temporal phase shift analysis provides highest accuracy (Patorski, 1993), but is suitable for static objects only.…”

Section: Motivationmentioning

confidence: 99%

“…The next stage uses the calculated transformation by finding a closest point to every analyzed point of the initially aligned cloud. After performing calculation of this distance for many points, a translation vector is accumulated to find the transformation matrix (Sitnik, 2009;Besl, 1992). By iteratively applying translations and rotations to the moved cloud the process is repeated until the overall fitting error does not decrease significantly, which is considered local best alignment of two clouds.…”

Section: Initial Alignment and Iterative Closest Pointmentioning

confidence: 99%

Processing Paths from Integrating Multimodal 3D Measurement of Shape, Color and BRDF

Sitnik

Krzesłowski

Mączkowski

2012

International Journal of Heritage in the Digital Era

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In this paper a description of multimodal measurement procedure, together with a complete processing path is provided as a demonstration of methods developed to perform integrated measurement and to generate a realistic 3D model. The shape and appearance of the resulting model is supposed to resemble objects behaviour in arbitrary illumination conditions. To accomplish this, the described integrated measuring device allows for accurate estimation of the 3D surface geometry, while a set of spectral filters and directional illuminators allows for multispectral color calculation and estimation of angular reflectance characteristics. The processing path is described with examples of visualized data at several stages for demonstration. Typical setup parameters and the overall time costs are also given for consideration. A real time rendering of the model is provided from several viewing directions to reveal the advantage of multimodal processing and the resemblance of object's non-trivial appearance.

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“…In recent years, 3D topography measurement technology has been widely used in cultural relic protection, the aerospace industry, reverse engineering, biomedicine, and other fields [1][2][3][4]. A non-contact measurement-the scanning method based on optics and vision-has been increasingly popular due to its high accuracy, good flexibility, and fast speed [5].…”

Section: Introductionmentioning

confidence: 99%

Linear Laser Scanning Measurement Method Tracking by a Binocular Vision

Luo

et al. 2022

Sensors

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The 3D scanning of a freeform structure relies on the laser probe and the localization system. The localization system, determining the effect of the point cloud reconstruction, will generate positioning errors when the laser probe works in complex paths with a fast speed. To reduce the errors, in this paper, a linear laser scanning measurement method is proposed based on binocular vision calibration. A simple and effective eight-point positioning marker attached to the scanner is proposed to complete the positioning and tracking procedure. Based on this, the method of marked point detection based on image moment and the principle of global coordinate system calibration are introduced in detail. According to the invariance principle of space distance, the corresponding points matching method between different coordinate systems is designed. The experimental results show that the binocular vision system can complete localization under different light intensities and complex environments, and that the repeated translation error of the binocular vision system is less than 0.22 mm, while the rotation error is less than 0.15°. The repeated error of the measurement system is less than 0.36 mm, which can meet the requirements of the 3D shape measurement of the complex workpiece.

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Automated full-3D shape measurement of cultural heritage objects

Cited by 6 publications

References 0 publications

Prognosis of Structural and Materials Health in Heritage Conservation

Prognosis of Structural and Materials Health in Heritage Conservation

Processing Paths from Integrating Multimodal 3D Measurement of Shape, Color and BRDF

Linear Laser Scanning Measurement Method Tracking by a Binocular Vision

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