Dr. Pierre Grussenmeyer Profile

Dr. Pierre Grussenmeyer

Head of Photogrammetry & Geomatics Group at INSA at ISPRS

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Publications (3)

Proceedings Article | 21 June 2015 Paper

Assessment of the accuracy of 3D models obtained with DSLR camera and Kinect v2

E. Lachat, H. Macher, T. Landes, P. Grussenmeyer

Proceedings Volume 9528, 95280G (2015) https://doi.org/10.1117/12.2184866

KEYWORDS: Clouds, 3D modeling, Sensors, Cameras, Photogrammetry, Neodymium, Ions, Visualization, Data acquisition, Photography

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Proceedings Article | 21 June 2011 Paper

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

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

Proceedings Volume 8085, 808508 (2011) https://doi.org/10.1117/12.890087

KEYWORDS: Clouds, 3D modeling, Photogrammetry, Laser scanners, Cultural heritage, Data modeling, Visualization, Visual process modeling, Scanners, Image resolution

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Several recording techniques are used together in Cultural Heritage Documentation projects. The main purpose of the documentation and conservation works is usually to generate geometric and photorealistic 3D models for both accurate reconstruction and visualization purposes. The recording approach discussed in this paper is based on the combination of photogrammetric dense matching and Terrestrial Laser Scanning (TLS) techniques. Both techniques have pros and cons, and criteria as geometry, texture, accuracy, resolution, recording and processing time are often compared. TLS techniques (time of flight or phase shift systems) are often used for the recording of large and complex objects or sites. Point cloud generation from images by dense stereo or multi-image matching can be used as an alternative or a complementary method to TLS. Compared to TLS, the photogrammetric solution is a low cost one as the acquisition system is limited to a digital camera and a few accessories only. Indeed, the stereo matching process offers a cheap, flexible and accurate solution to get 3D point clouds and textured models. The calibration of the camera allows the processing of distortion free images, accurate orientation of the images, and matching at the subpixel level. The main advantage of this photogrammetric methodology 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 the matching and processing steps, we can use the resulting data in much the same way as a TLS point cloud, but with really better raster information for textures. The paper will address the automation of recording and processing steps, the assessment of the results, and the deliverables (e.g. PDF-3D files). Visualization aspects of the final 3D models are presented. Two case studies with merged photogrammetric and TLS data are finally presented: - The Gallo-roman Theatre of Mandeure (France); - The Medieval Fortress of Châtel-sur-Moselle (France), where a network of underground galleries and vaults has been recorded.

Proceedings Article | 22 December 2000 Paper

ARPENTEUR: a web-based photogrammetry tool for architectural modeling

Pierre Grussenmeyer, Pierre Drap

Proceedings Volume 4309, (2000) https://doi.org/10.1117/12.410866

KEYWORDS: 3D modeling, Java, Image processing, 3D image processing, Photogrammetry, Internet, Cameras, 3D metrology, Computing systems, Data modeling

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