Abstract
Abstract. Handheld 3D scanners can be used to complete large scale models with the acquisition of occluded areas or small artefacts. This may be of interest for digitization projects in the field of Cultural Heritage, where detailed areas may require a specific treatment. Such sensors present the advantage of being easily portable in the field, and easily usable even without particular knowledge. In this paper, the Freestyle3D handheld scanner launched on the market in 2015 by FARO is investigated. Different experiments are described, covering various topics such as the influence of range or color on the measurements, but also the precision achieved for geometrical primitive digitization. These laboratory experiments are completed by acquisitions performed on engraved and sculpted stone blocks. This practical case study is useful to investigate which acquisition protocol seems to be the more adapted and leads to precise results. The produced point clouds will be compared to photogrammetric surveys for the purpose of their accuracy assessment.
Highlights
Documentation and study of Cultural Heritage rely more and more on geometry and texture recording, whether it is on large scale sites or small objects
Several acquisition techniques can be mentioned, from terrestrial laser scanning for large expanses to photogrammetry when dealing with detailed objects (Grussenmeyer et al, 2016)
The experiments carried out all along this article lead to several conclusions, such as the growing presence of noise in the point clouds when the range increases
Summary
Documentation and study of Cultural Heritage rely more and more on geometry and texture recording, whether it is on large scale sites or small objects. Thanks to the continuous development of materials and techniques for collecting the real geometry of observed scenes, 3D digitization belongs to the conventional workflow to meet the needs in terms of digital conservation, restoration and visualization. Several acquisition techniques can be mentioned, from terrestrial laser scanning for large expanses to photogrammetry when dealing with detailed objects (Grussenmeyer et al, 2016). Terrestrial Laser Scanners (TLS) are used to collect a large amount of accurate data in a very timely manner. For smaller scale artefacts on the other hand, image-based techniques are most of the time adopted. To lower costs of the required material, photogrammetric techniques are boosted by the development of always more powerful algorithms for image processing towards reconstruction of 3D data (Remondino et al, 2014). Given that the use of one acquisition method alone may not always be sufficient in some projects, both methodologies can be merged in order to overcome their respective limitations and to provide more exhaustive models
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