IMEKO Event Proceedings

Page 4 of 822 Results 31 - 40 of 8218

Roberto Cesareo, Stefano Ridolfi, Antonio Brunetti, Ricardo T. Lopes, Giovanni E. Gigante
3D Imaging of Paintings by Scanning with a Portable EDXRF-Device

3D map of chemical elements distribution from energy dispersive X-ray fluorescence (EDXRF) analysis would be a perfect conclusion to study in detail any type of artifact. This map can be easily achieved by using synchrotron light as source of radiation, and micro-optics both at the source and at the detector. In such a manner a micro-voxel is irradiated and detected, which can be at any depth with respect to the surface of the artifact. This method is effective but needs a synchrotron; therefore its use in archaeometry is greatly limited. An alternative method is proposed in the present paper, which uses the altered Kα/Kβ or Lα/Lβ-ratios to localize the chemical elements. This method employs a portable EDXRF-device, characterized by a small size X-ray tube and a Si-drift detector. Several examples are described.

Andrzej Masłowski, Janusz Będkowski, Paweł Musialik, Karol Majek

This paper presents the gathering, processing and presenting 3D data for use in Advanced Robotics Applications like Search and Rescue operations. The data are gathered by unmanned ground platforms, in the form of 3D point clouds via laser scanning systems. The clouds are matched and transformed into a consistent, highly accurate 3D model. The paper describes the pipeline for such matching based on Iterative Closest Point algorithm supported by loop closing done with LUM method. The pipeline was implemented for parallel computation with NVIDIA CUDA, which leads to higher matching accuracy and lower computation time.

Tomasz Koszmider, Krzysztof Strzecha

New 3D medical images reconstruction algorithm is presented in this paper. It concerns utilization of digital processing and analysis of Computed Tomography images in process of 3D lungs reconstruction.

Kazuhiro Enami, Tatuya Kume, Yasuo Higashi, Kenji Ueno

We strive to develop a 3D coordinate measuring machine, which can measure the inner shape of a cavity with a complex shape. Currently, the ILC (International Linear Collider) project is progressing through international collaboration. The major goal of ILC is to produce and investigate Higgs bosons. ILC consists of two linear accelerators facing each other, and will hurl some 10 billion electrons and positrons toward each other at nearly the speed of light. The cavity is an important component to accelerate particles to near light speed. A cavity’s inner 3D shape influences the accelerating performance. Therefore, it is important to measure the inner 3D shape of a cavity. However, it is difficult to measure the inner shape of cavities with complex shapes like a bellows. We are developing a highly accurate, inner shape measuring machine using triangulation and a measuring method.

Yuri Chugui, Sergei Plotnikov, Anatoly Potashnikov, Alexander Verkhogliad

The novel results of the R & D activity of TDI SIE SB RAS in the field of the optical measuring technologies, as well as laser technologies for solving safety problems are presented. To measure the rocks stress and to prevent the mountain impact, as well as for basic investigations, a set of optical-electronic deformers and systems was developed and produced. For permanent noncontact bearing position inspection of oil-drilling platforms on Sakhalin coast (Russia) we have developed optical-electronic method and system SAKHALIN. Multifunctional laser technological system LSP-2000 equipped by two Nd-YAG lasers was developed for cutting, welding and surface micro profiling with ablation process (working range of 3 x 2 x 0.6 m³, positioning error less than 10 mkm). Results of development and testing the specialized high productive laser measuring machine, based on structured illumination, for 3D inspection of grid spacers for Russian nuclear reactors with micron resolution are presented. Using high-speed laser noncontact method on the base of triangulation position sensors, TDI SIE has developed and produced automatic laser diagnostic system COMPLEX for inspection of geometric parameters of wheel pairs (train speed up to 60 km/hr.), which is used successfully on Russian railways.

Efstratia Chatzi, Stamatis Chatzistamatis, Nikolaos Soulakellis, Nikolaos Zouros, Christos-Nikolaos Anagnostopoulos
3D Modelling of Petrified Trees: Laser Scanning vs Photogrammetry

In this paper, a methodology for the photogrammetric and laser scan survey of tree fossils of the Petrified Forest on Lesvos island in Greece, is proposed.The Petrified Forest is of particular interest since it is one of the rarest monuments of geological heritage worldwide and it was formed from the fossilized remains of plants. During this study, photogrammetric and laser scanning data by the tree fossils have been gathered, processed and modelled in 3D, and a comparison of the two techniques is taking place. Finally, the most suitable technique for the 3D modelling of objects such as the petrified trees is proposed.

Mauro Lo Brutto, Maria Grazia Spera
3D mosaics survey: analysis of photogrammetric/computer vision approach in a metrological context

The goal of the paper is evaluate photogrammetric/computer vision approach in a metrological context for 3D mosaics survey. The aim of the mosaics survey is the production of a full-scale representation (scale 1:1) useful for the documentation and for the restoration processes. In order to evaluate the optimal photogrammetric/computer vision workflow in this work three different surveys have been done for three mosaics with different size and location. Two of these are stored at Regional Archaeological Museum “Antonino Salinas” in Palermo (Italy) and the other one is stored at Regional Archaeological Museum “Baglio Anselmi” in Marsala (Italy). The research has allowed to show the potentiality and the issues of photogrammetric/computer vision approach for the 3D mosaic documentation.

S. N. Makarov, S. V. Plotnikov, E. V. Sysoev, A. G. Verkhogliad, P. S. Zav’yalov, Yu. V. Chugui, A. V. Latyshev, E. S. Senchenko

Solving many actual safety problems in science, atomic, optics-mechanical and railway industry takes 3D optical measuring technologies with micro-/ nanometer resolution and productivity from 100 to 105 meas./s. The novel results of the R & D activity of TDI SIE SB RAS in this field are presented.

M. Mongelli, I. Bellagamba, G. Bracco, S. Migliori, A. Perozziello, S. Pierattini, A. Quintiliani, B. Mazzei
3D photogrammetric reconstruction by "Structure from Motion" as a monitoring technique for safety, conservation and improvement of the fruition of cultural heritage

In the last years, with the large growth of new state-of-the-art technologies used in the field of cultural heritage, it's increasingly necessary to promote non-invasive and non-destructive techniques which are "sensitive" to the nature of the site in which they are applied, respecting the Italian historical artistic heritage. Within the COBRA project [1], ENEA developed a new low-cost and non-destructive survey technique by 3D Photogrammetric reconstruction, using the Structure from Motion (SfM) method, for innovative applications in the field of cultural heritage [2]. This paper shows an application of this methodology on the archaeological complex of Priscilla's Catacombs in Rome. Three case studies have been identified, with several design purposes, showing the different applications of this technique: a sarcophagus called "Sarcofago delle Muse" , a chapel named "Cappella Greca" and a masonry element, which are all situated in the "Criptoportico" area.

Domenico Sguerso, Annalisa Azzola, Carlo Nike Bianchi, Bianca Federici, Sara Gagliolo, Carla Morri, Monica Montefalcone
3D photogrammetric surveys on coral reefs in the Maldives

The global increase in seawater temperature is causing irreparable damages to coral reefs all over the world. Frequency of coral bleaching episodes and mass mortality is increasing and coral reefs have not enough time to recover after these impacts. The present study concerns this phenomenon in the context of the Maldives. In this scenario, monitoring activities are very important to check the health of coral reefs, and the adoption of specific parameters such as reef rugosity and accretion of corals provides important measures of the ability of reefs to recover after bleaching. Moreover, the use of photogrammetry allows speeding up the on-site measurements, enlarging the scale and the reliability. The input data are the images traditionally taken by operators for visual analysis, paying attention to the achievement of photogrammetric principles.

Page 4 of 822 Results 31 - 40 of 8218