Dynamic objects detection and tracking for a laser scanner and camera system

2017 ◽  
Author(s):  
Cheng Zou ◽  
Bingwei He ◽  
Liwei Zhang ◽  
Jianwei Zhang
Keyword(s):  
Laser Scanner ◽  
Camera System ◽  
Detection And Tracking ◽  
Dynamic Objects ◽  
Objects Detection

XVIII Century Wooden Stretchers Structure Designed for Large Canvas and an Example of the Assessment Method

2013 ◽  
Vol 778 ◽  
pp. 113-118 ◽  
Author(s):  
Katarzyna Górecka ◽  
Marek Sklodowski ◽  
Piotr Pawłowski ◽  
Joanna Szpor ◽  
Henryk Arendarski
Keyword(s):  
Laser Scanner ◽  
Assessment Method ◽  
Camera System ◽  
Large Size ◽  
Poor Access ◽  
Unique Shape ◽  
Actual Shape ◽  
Frame Construction ◽  
Direct Inspection

Paper discusses large size canvas paintings stretching methods and deformations and damages specific for large canvas resulting from an incorrect stretching. Analysis of the preservation state of a wooden stretcher construction and its functionality was an important step in development of the program of conservation work. The case study of M. H Loders painting "Adoration of the Magi" (XVIII c.) from the cathedral Saint - Aubain in Namur (Belgium) is presented. The painting is exhibited 5,5 m above the floor and has a unique shape, as the wooden stretcher frame is adjusted to the round apse walls. Thus usual direct inspection was difficult due to poor access to the reverse side of the painting. Preliminary conclusions on the construction and preservation state of the stretcher frame were drawn on the basis of a thorough inspection of the painting surface. Actual shape of the painting and precise stretchers dimensions were measured with a laser scanner. More information concerning the stretcher frame construction was obtained from a simple micro-camera system combined with LED lighting introduced from the canvas reverse side.

Geomorphological and hydrological characterization of a meandering river by UAV and UWV applications

2020 ◽  
Author(s):  
László Bertalan ◽  
Hannes Sardemann ◽  
David Mader ◽  
Noémi Mária Szopos ◽  
Bálint Nagy ◽  
...  
Keyword(s):  
Cross Sections ◽  
River Flow ◽  
Accuracy Assessment ◽  
Laser Scanner ◽  
Infrared Image ◽  
Data Availability ◽  
Flow Conditions ◽  
Camera System ◽  
Single Beam ◽  
Meandering River

<p>The Sajó River in Hungary is a medium-sized sand-bed river along which intensive meander development and bank erosion occur. The process threatens agricultural lands and populated areas extensively.  Therefore, preventive river management is needed.</p><p>Main geomorphological features, processes and in-channel flow conditions have to be studied in detail in order to reveal main driving factors. Datasets with high spatio-temporal resolution are necessary to identify relevant parameters. However, so far data density at this river is sparse and gauging stations are distributed poorly.</p><p>The aim of this study is the improvement of data availability to measure and model hydromorphodynamics of single reaches of the Sajó River. Therefore, multi-temporal field campaigns along selected sub-reaches are conducted with Unmanned Aerial Vehicles (UAV) and Unmanned Water Vehicles (UWV) to survey the topography, the river bed and flow conditions. The channel bathymetry is measured by a single-beam echo sounder mounted on a self-designed remotely controlled boat. The boat also integrates a Mobile Laser Scanner (MLS) to measure the river banks. Furthermore, a panorama camera system is installed to improve the pose estimation of the UWV functioning as a calibrated multi-sensor platform. UAV surveys were performed, using RGB and Thermal Infrared image sequences, to apply image velocimetry algorithms to characterize the river flow at selected cross-sections.  ADCP measurements and Terrestrial Laser Scans (TLS) are used for accuracy assessment of the novel datasets.</p><p>Eventually, data captured over a 2-years period will be implemented into hydrodynamic modeling of the studied sub-reaches to better understand seasonal variations in channel morphodynamics.</p><p>----<br>The project has been founded by the DAAD (57448822) and (Tempus Public Foundation & DAAD 307670). The research is also influenced by the HARMONIOUS COST Action (CA16219).</p>

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