Benjamin Langmann

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Background subtraction is a common first step in the field of video processing and it is used to reduce the effective image size in subsequent processing steps by segmenting the mostly static background from the moving or changing foreground. In this paper previous approaches towards background modeling are extended to handle videos accompanied by(More)
How good are cheap depth cameras, namely the Microsoft Kinect, compared to state of the art Time-ofFlight depth cameras? In this paper several depth cameras of different types were put to the test on a variety of tasks in order to judge their respective performance and to find out their weaknesses. We will concentrate on the common area of applications for(More)
For a few years cameras have been available which are able to provide depth values gained from a PMD chip through the Time-of-Flight principle. Recently, cameras combining a normal color chip with such a PMD chip in a monocular setup have been developed. One drawback of these 2D/3D cameras is that the resolution of the depth images is much lower than those(More)
Atmospheric transport and deposition of Indonesian volcanic emissions M. A. Pfeffer, B. Langmann, and H.-F. Graf Department of the Atmosphere in the Earth System, Max-Planck-Institute for Meteorology, Hamburg, Germany Department of Geography, University of Cambridge, Cambridge, UK Received: 6 September 2005 – Accepted: 8 October 2005 – Published: 21(More)
Interaction with mobile consumer devices leads to a higher acceptance and affinity of persons to natural user interfaces and perceptional interaction possibilities. New interaction modalities become accessible and are capable to improve human machine interaction even in complex and high risk environments, like the operation room. Here, manifold medical(More)
In this work, a secure wireless sensor network (WSN) for the surveillance, monitoring and protection of critical infrastructures was developed. To guarantee the security of the system, the main focus was the implementation of a unique security concept, which includes both security on the communication level, as well as mechanisms that ensure the functional(More)
In this paper a tracking approach designed to utilize multiple cameras with optional depth information, e.g., ToF cameras, structured light cameras and stereo or multi camera setups, is discussed which combines photometric tracking with volumetric tracking. It is able to work with any number and type of cameras. In order to achieve this objective the(More)