Sébastien Guillaume

Range imaging technology: new developments and applications for people identification and tracking

Range Imaging (RIM) is a new suitable choice for measurement and modeling in many different applications. RIM is a fusion of two different technologies. According to the terminology, it integrates distance measurement as well as imaging aspects. The distance measurement principle is dominated by the time-of-flight principle while the imaging array (e.g. CMOS sensor) enables each pixel to store also the distance towards the corresponding object point. Due to the technologys relatively new appearance on the market, with a few different realizations, the knowledge of its capabilities is very low. In this paper we present our investigations on the range imaging camera SwissRangerTM (realized by the Swiss Center for Electronics and Microtechnology, CSEM). Different calibration procedures are performed, including a photogrammetric camera calibration and a distance system calibration with respect to the reflectivity and the distance itself. Furthermore we report about measurement applications in the field of surveillance and biometrics. In particular, range imaging data of moving people are analyzed, to identify humans, detect their movements and recover 3D trajectories.

Confirming regional 1 cm differential geoid accuracy from airborne gravimetry: the Geoid Slope Validation Survey of 2011

A terrestrial survey, called the Geoid Slope Validation Survey of 2011 (GSVS11), encompassing leveling, GPS, astrogeodetic deflections of the vertical (DOV) and surface gravity was performed in the United States. The general purpose of that survey was to evaluate the current accuracy of gravimetric geoid models, and also to determine the impact of introducing new airborne gravity data from the ‘Gravity for the Redefinition of the American Vertical Datum’ (GRAV-D) project. More specifically, the GSVS11 survey was performed to determine whether or not the GRAV-D airborne gravimetry, flown at 11 km altitude, can reduce differential geoid error to below 1 cm in a low, flat gravimetrically uncomplicated region. GSVS11 comprises a 325 km traverse from Austin to Rockport in Southern Texas, and includes 218 GPS stations (

The Geoid Slope Validation Survey 2014 and GRAV-D airborne gravity enhanced geoid comparison results in Iowa

\sigma _{\Delta h }= 0.4

Measurement of Underground Variations in the Deflection of the Vertical with a High Precision Interferometric Deflectometer

σΔh=0.4 cm over any distance from 0.4 to 325 km) co-located with first-order spirit leveled orthometric heights (

Monitoring of the refraction coefficient in the lower atmosphere using a controlled setup of simultaneous reciprocal vertical angle measurements

\sigma _{\Delta H }= 1.3

QDaedalus: Augmentation of Total Stations by CCD Sensor for Automated Contactless High-Precision Metrology

σΔH=1.3 cm end-to-end), including new surface gravimetry, and 216 astronomically determined vertical deflections