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1

Adaptive lighting for inhomogeneous reflectivity compensation in applications for 3D shape measurements

Casavola Caterina, Pappalettera Giovanni

Optica Applicata

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2019

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Vol. 49, nr 1

89--99

EN

Surface 3D reconstruction is a topic of great relevance and it has a wide range of applications in many fields such as mechanics, bioengineering and arts. Nowadays optical systems for 3D contouring such as those based on structured light projection are becoming more and more widespread. The possibility to get shape information without any contact with the object, in fact, is a great advantage in some fields such as, for example, cultural heritage. For this class of objects, however, the issue connected with inhomogeneous reflectivity must be taken into account. Due to the different level of reflectivity, in different areas of the object, it comes out that the contrast of the projected pattern changes and, as a direct consequence, the achievable accuracy can change from part to part. In this paper, a study on the possibility to implement an adaptive lighting algorithm is performed allowing to adapt illumination in order to compensate the local inhomogeneities in terms of surface reflectivity.

2

Case study of virtual reconstruction of the Wkryujście Altar based on the structured light projection

Specjalny B., Mantiuk R.

Metody Informatyki Stosowanej

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2010

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nr 1 (22)

163-173

EN

In this paper we present case study of virtual reconstruction of the Wkryujście Altar, one of the greatest cultural heritage both Polish and German nations in West Pomeranian region in Poland. We analyze main strategies of recovering of the 3D shape of a physical object and recommend the structured light projection technique as the most suitable for the Altar. By illuminating the surface with images consisting of a light pattern, the correspondence between projector and camera pixels can be uniquely identified. Recovering transformations of the pattern pixel, it is possible to capture a 3-D point on the surface of an object. The structured light projection technique doesn’t require expensive hardware and satisfactory results can be achieved using off-the-shelf equipment. We built basic form of the structured light hardware setup and conducted a case study of measurement fidelity. The achieved results are presented in the paper together with discussion of using structured light projection to reconstruct cultural heritage objects.

3

Measurements for virtual museum: the Kórnik Castle

Sitnik R., Załuski W., Kowalski M., Bolewicki P.

Elektronika : konstrukcje, technologie, zastosowania

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2004

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Vol. 45, nr 8-9

299-302

EN

This paper presents a full processing path from 3D-object scanning to its virtual representation with special focus on the virtual museum application. The measurement technique is based on opto-numerical approach using structured light projection. As an example, results of the measurement session in Kórnik Castle are presented, where the main goal was 3D digitizing of several cultural objects such as armours, bas-reliefs, sculptures and many more. These full 3D models (including geometry and texture) will be used in the interactive television (and TVP) project.

PL

W artykule zaprezentowana jest pełna ścieżka przetwarzania danych pomiarowych od trójwymiarowego pomiaru obiektów rzeczywistych do ich wirtualnej reprezentacji ze specjalną uwagą poświęconą zastosowaniom w wirtualnych muzeach. Technika pomiarowa bazuje na podejściu opto-numerycznym wykorzystującym projekcję z oświetleniem strukturalnym. Autorzy przytaczają efekty dwutygodniowej sesji pomiarowej na Zamku Kórnickim, której celem było stworzenie modeli wybranych eksponatów muzealnych i obiektów historycznych takich jak elementy zbroi, zdobienia ścian, rzeźby i inne. Kompletne modele tych przedmiotów (tzn. określające zarówno geometrię, jak i teksturę) będą wykorzystane w pilotażowym nowatorskim projekcie telewizji interaktywnej i TVP.