Jochen Willneff

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One of the instruments on board of the ALOS satellite, launched by the Japanese Aerospace Exploration Agency (JAXA) in 2006, is the Panchromatic Remote-sensing Instrument for Stereo Mapping (PRISM). PRISM has three cameras with different viewing directions (nadir, forward, backward), recording imagery with a ground resolution of 2.5 m. A main characteristic(More)
The extraction of metric information from image data is highly relevant for the update of geospatial data bases. Photogrammetric methods offer tools to extract such information in a reliable and accurate manner from mostly multiple image setups using appropriate sensor models. These methods require a certain amount of expertise and often expensive software(More)
In many augmented reality applications, in particular in the medical and industrial domains, knowledge about tracking errors is important. Most current approaches characterize tracking errors by 6× 6 covariance matrices that describe the uncertainty of a 6DOF pose, where the center of rotational error lies in the origin of a target coordinate system. This(More)
Marker-based optical outside-in tracking is a mature and robust technology used by many AR, VR and motion capture applications. However, in small environments the tracking cameras are often difficult to install. An example scenario are ergonomic studies in car manufacturing, where the motion of a worker needs to be tracked in small spaces such as the trunk(More)
The CARTOSAT 1 satellite, launched by the Indian Space Research Organisation (ISRO) in 2005, can provide panchromatic alongtrack stereo imagery with a ground resolution of 2.5 m. Along with the imagery, encrypted files with rational polynomial coefficients (RPCs) and meta-data are distributed by ISRO. The RPCs allow direct georeferencing within certain(More)
In industrial manufacturing processes, targets for infrared marker based tracking have to be robust and must integrate into the tools without disturbing the work flow. In this paper, we propose cylindrical markers attached directly to the tool. We show that, targets equipped with cylindrical markers can be tracked with about the same precision as targets(More)
In a coorperation of the Department of Veterinary Surgery at the University of Zurich and the Institute of Geodesy and Photogrammetry at ETH Zurich, a system for the measurement of threedimensional deformations of horse hooves under different load conditions has been developed. The system consists of a force sensor panel and three Sony XC75CE CCD cameras(More)