Accurate documentation in cultural heritage by merging TLS and high-resolution photogrammetric data

Grussenmeyer, Pierre; Alby, Emmanuel; Assali, Pierre; Poitevin, Valentin; Hullo, Jean-Francois; Smigiel, Eddie

doi:10.1117/12.890087

Cited by 29 publications

(18 citation statements)

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“…A review of papers related to the topic of merging TLS and photogrammetry data has been presented in Grussenmeyer et al (2011). The choice of the most effective technique is not always obvious (El-Hakim et al, 2004;Grussenmeyer et al, 2008;Remondino and Rizzi, 2010).).…”

Section: Recording In Cultural Heritage Is Technology Drivenmentioning

confidence: 99%

Recording Approach of Heritage Sites Based on Merging Point Clouds From High Resolution Photogrammetry and Terrestrial Laser Scanning

Grussenmeyer

Alby

Landes

et al. 2012

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:Different approaches and tools are required in Cultural Heritage Documentation to deal with the complexity of monuments and sites. The documentation process has strongly changed in the last few years, always driven by technology. Accurate documentation is closely relied to advances of technology (imaging sensors, high speed scanning, automation in recording and processing data) for the purposes of conservation works, management, appraisal, assessment of the structural condition, archiving, publication and research (Patias et al., 2008). We want to focus in this paper on the recording aspects of cultural heritage documentation, especially the generation of geometric and photorealistic 3D models for accurate reconstruction and visualization purposes. The selected approaches are based on the combination of photogrammetric dense matching and Terrestrial Laser Scanning (TLS) techniques. Both techniques have pros and cons and recent advances have changed the way of the recording approach. The choice of the best workflow relies on the site configuration, the performances of the sensors, and criteria as geometry, accuracy, resolution, georeferencing, texture, and of course processing time. TLS techniques (time of flight or phase shift systems) are widely used for recording large and complex objects and sites. Point cloud generation from images by dense stereo or multi-view matching can be used as an alternative or as a complementary method to TLS. Compared to TLS, the photogrammetric solution is a low cost one, as the acquisition system is limited to a high-performance digital camera and a few accessories only. Indeed, the stereo or multi-view matching process offers a cheap, flexible and accurate solution to get 3D point clouds. Moreover, the captured images might also be used for models texturing. Several software packages are available, whether web-based, open source or commercial. The main advantage of this photogrammetric or computer vision based technology is to get at the same time a point cloud (the resolution depends on the size of the pixel on the object), and therefore an accurate meshed object with its texture. After matching and processing steps, we can use the resulting data in much the same way as a TLS point cloud, but in addition with radiometric information for textures.

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Section: Recording In Cultural Heritage Is Technology Drivenmentioning

confidence: 99%

Recording Approach of Heritage Sites Based on Merging Point Clouds From High Resolution Photogrammetry and Terrestrial Laser Scanning

Grussenmeyer

Alby

Landes

et al. 2012

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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“…But this project shows again an example of combination of laser scanning (scan arm) and photogrammetry (Grussenmeyer et al, 2011) .…”

Section: CMmentioning

confidence: 99%

Digitization of Blocks and Virtual Anastylosis of an Antique Facade in Pont-Sainte-Maxence (France)

Alby

Grussenmeyer

Bitard

et al. 2017

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:This paper is dedicated to the digitization of blocks and virtual anastylosis of an antique façade in Pont-Sainte-Maxence (France). In 2014 during the construction of a shopping center, the National Institute for Preventive Archaeological Research (INRAP) discovered a Gallo-Roman site from the 2 nd century AD. The most interesting part of the site for the study is a façade of 70 meters long by nearly 10 meters high. The state of the conservation of the blocks of the façade makes them exceptional due to the question raised by the collapse. Representative and symbolic blocks of this building have been selected for a virtual anastylosis study. The blocks discovered belong to different types: decorated architectural blocks, monumental statuary elements and details of very fine decorations. The digital reproduction of the façade will facilitate the formulation of hypothesis for the collapse of the structure. The Photogrammetry and Geomatics Group from INSA Strasbourg is in charge of the digitization, the anastylosis and the development of exploratory methods for understanding the ruin of the façade. To develop the three-dimensional model of the facade, approximately 70 blocks of various dimensions were chosen by the archaeologists. The choice of the digitization technique is made according to the following pragmatic criterion: the movable objects are acquired with a scan-arm or a hand-held scanner in the laboratory and the largest blocks are recorded by photogrammetry at the repository near Paris. The expected types of deliverables are multiple: very accurate 3D models with the most faithful representation to document the objects in the best way and with optimized size model allowing easy handling during anastylosis tests. The visual aspect of the models is also a very important issue. Indeed, textures from photos are an excellent way to bring about the realism of the virtual model, but fine details of the object are sometimes blurred by the uniformity of the color of the original material. Acquisition by hand-held scanner does not provide the textures (they must be acquired according to a complementary process). The data types are therefore different depending on the acquisition. The type of rendering of the models depends therefore on precise choices to be defined optimally. After the acquisition, hypothesis for the construction of the façade must be validated and / or adapted by the anastylosis of the digitized blocks. Different cases must be taken into account. First, the reconstruction of broken blocks is done by adjusting the recovered fragments. If all the fragments discovered are close to the initial shape of the block, the process is assimilated to a puzzle of complex surfaces. If the fragments have no contact but are an integral part of the block, the proportion of hypotheses in relation to the contact pieces is changed. And finally, if the blocks are to be assembled together by superposition and thanks to a common plan, as assumed during the construction, the restitution could be based on the posi...

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“…Therefore, accuracy and resolution must be carefully planned and instruments and techniques must be chosen to produce the required data (Guarnieri et al 2006, Grussenmeyer at al. 2011, Lerma et al 2011 Table 1.…”

Section: Multi-scale Approachmentioning

confidence: 99%

High-Quality 3d Models and Their Use In a Cultural Heritage Conservation Project

Tucci

Bonora

Conti

et al. 2017

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:Cultural heritage digitization and 3D modelling processes are mainly based on laser scanning and digital photogrammetry techniques to produce complete, detailed and photorealistic three-dimensional surveys: geometric as well as chromatic aspects, in turn testimony of materials, work techniques, state of preservation, etc., are documented using digitization processes. The paper explores the topic of 3D documentation for conservation purposes; it analyses how geomatics contributes in different steps of a restoration process and it presents an overview of different uses of 3D models for the conservation and enhancement of the cultural heritage. The paper reports on the project to digitize the earthenware frieze of the Ospedale del Ceppo in Pistoia (Italy) for 3D documentation, restoration work support, and digital and physical reconstruction and integration purposes. The intent to design an exhibition area suggests new ways to take advantage of 3D data originally acquired for documentation and scientific purposes.

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Accurate documentation in cultural heritage by merging TLS and high-resolution photogrammetric data

Cited by 29 publications

References 0 publications

Recording Approach of Heritage Sites Based on Merging Point Clouds From High Resolution Photogrammetry and Terrestrial Laser Scanning

Recording Approach of Heritage Sites Based on Merging Point Clouds From High Resolution Photogrammetry and Terrestrial Laser Scanning

Digitization of Blocks and Virtual Anastylosis of an Antique Facade in Pont-Sainte-Maxence (France)

High-Quality 3d Models and Their Use In a Cultural Heritage Conservation Project

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