Dr. Frank Lehmann Profile

Dr. Frank Lehmann

at Deutsches Zentrum für Luft- und Raumfahrt eV

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Publications (12)

Proceedings Article | 20 September 2020 Presentation + Paper

Characterization of an affordable and compact gated-viewing system for maritime search and rescue applications

Zsófia Jurányi, Jendrik Schmidt, Enno Peters, Frank Lehmann

Proceedings Volume 11538, 1153805 (2020) https://doi.org/10.1117/12.2571142

KEYWORDS: Visibility, Cameras, Visibility through fog, Reflectivity, Reflectors, Vertical cavity surface emitting lasers, Fiber optic gyroscopes, Enhanced vision, Scattering media, Sensors

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Proceedings Article | 10 October 2019 Presentation + Paper

Development of a novel low-cost NIR gated-viewing sensor for maritime search and rescue applications

Enno Peters, Jendrik Schmidt, Zsófia Jurányi, Marco Berger, Stefan Scherbarth, Frank Lehmann

Proceedings Volume 11160, 1116004 (2019) https://doi.org/10.1117/12.2532538

KEYWORDS: Signal to noise ratio, Sensors, Cameras, Image processing, Reflectors, Visibility, Photons, Near infrared, Pulsed laser operation

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Proceedings Article | 3 April 2018 Open Access

A compact very high resolution camera (VHRC) for Earth and planetary exploration using a large array (7k x 8k) CCD

Hans-Georg Grothues, Frank Lehmann, Harald Michaelis, Gerhard Neukum, Rene Pischel, Einhard Ress

Proceedings Volume 10570, 105700D (2018) https://doi.org/10.1117/12.2326445

KEYWORDS: Cameras, CCD cameras, Astronomical imaging

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Proceedings Article | 7 October 2009 Paper

Airborne camera and spectrometer experiments and data evaluation

F. Lehmann, T. Bucher, S. Pless, J. Wohlfeil, H. Hirschmüller

Proceedings Volume 7478, 74781D (2009) https://doi.org/10.1117/12.830722

KEYWORDS: Sensors, RGB color model, Data modeling, Cameras, Imaging systems, 3D modeling, Systems modeling, Data acquisition, Data fusion, Data processing

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Proceedings Article | 7 October 2009 Paper

Small drones for geo-archaeology in the steppes: locating and documenting the archaeological heritage of the Orkhon Valley in Mongolia

M. Oczipka, J. Bemmann, H. Piezonka, J. Munkabayar, B. Ahrens, M. Achtelik, F. Lehmann

Proceedings Volume 7478, 747806 (2009) https://doi.org/10.1117/12.830404

KEYWORDS: Cameras, Photography, Unmanned aerial vehicles, Image resolution, Image processing, Global Positioning System, 3D modeling, Aerospace engineering, Digital photography, Panoramic photography

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The international project "Geo-Archaeology in the Steppe - Reconstruction of Cultural Landscapes in the Orkhon valley, Central Mongolia" was set up in July 2008. It is headed by the Department of Pre- and Protohistoric Archaeology of Bonn University. The project aims at the study of prehistoric and historic settlement patterns, human impact on the environment and the relation between towns and their hinterland in the Orkhon valley, Central Mongolia. The multidisciplinary project is mainly sponsored for three years by the German Federal Ministry of Education and Research (BMBF) and bridges archaeology, natural sciences and engineering (sponsorship code 01UA0801C). Archaeologists of the Mongolian Academy of Sciences and of the Bonn University, geographers of Free University Berlin, geophysics of the Institute for Photonic Technology Jena and the RWTH Aachen University, and geographers and engineers of the German Aerospace Centre Berlin collaborate in the development of new technologies and their application in archaeology¹. On the basis of Russian aerial photographs from the 1970s, an initial evaluation regarding potential archaeological sites was made. Due to the poor geometric and radiometric resolution of these photographs, identification of archaeological sites in many cases remained preliminary, and detailed information on layout and size could not be gained. The aim of the flight campaign in September 2008 was therefore the confirmation of these sites as well as their high resolution survey. A 10 megapixel range finder camera was used for the recording of high resolution aerial photography. This image data is suited for accurate determination and mapping of selected monuments. The airborne camera was adapted and mounted on an electrically operated eight propeller small drone. Apart from high resolution geo-referenced overview pictures, impressive panoramic images and very high resolution overlapping image data was recorded for photogrammetric stereoscopic processing. Due to the overlap of 85% along and across the track each point in the image data is recorded in at least four pictures. Although a smaller overlap might be sufficient for generating digital surface models (DSM), this redundancy increases the reliability of the DSM generation. Within this photogrammetric processing digital surface models and true ortho photo mosaics with a resolution up to 2,5 cm/pixel in X, Y, Z are derived.

Proceedings Article | 7 October 2009 Paper

Adaptation of building extraction rule sets derived from MFC3 and UltraCamD arial image data sets

A. Trosset, T. Bucher, F. Lehmann

Proceedings Volume 7478, 74782U (2009) https://doi.org/10.1117/12.830662

KEYWORDS: Spatial resolution, Sensors, Image segmentation, Image processing, Data modeling, Image resolution, Geographic information systems, Cameras, Feature extraction, Vegetation

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Proceedings Article | 17 October 2007 Paper

New optical sensor systems for high-resolution satellite, airborne and terrestrial imaging systems

Andreas Eckardt, Anko Börner, Frank Lehmann

Proceedings Volume 6744, 674408 (2007) https://doi.org/10.1117/12.732031

KEYWORDS: Sensors, Imaging systems, Charge-coupled devices, Modulation transfer functions, Microsoft Foundation Class Library, RGB color model, CCD image sensors, Remote sensing, Control systems, Satellites

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Proceedings Article | 14 March 2003 Paper

HRSC hgh resolution stereo camera digital airborne imager: three years of operational data production and applications

Frank Lehmann

Proceedings Volume 4886, (2003) https://doi.org/10.1117/12.467510

KEYWORDS: Imaging systems, Image resolution, Data modeling, Spatial resolution, Data acquisition, Cameras, Stereoscopic cameras, Scanners, Charge-coupled devices, Image processing

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Proceedings Article | 17 June 1996 Paper

Fusion of airborne hyperspectral and multispectral images

Boris Zhukov, Dieter Oertel, Peter Strobl, Frank Lehmann, Manfred Lehner

Proceedings Volume 2758, (1996) https://doi.org/10.1117/12.243210

KEYWORDS: Image fusion, Image resolution, Spectroscopy, Spatial resolution, Data fusion, Sensors, Hyperspectral imaging, Scanners, Image classification, Multispectral imaging

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Proceedings Article | 17 June 1996 Paper

Preprocessing for the digital airborne imaging spectrometer DAIS 7915

Peter Strobl, Rudolf Richter, Frank Lehmann, Andreas Mueller, Boris Zhukov, Dieter Oertel

Proceedings Volume 2758, (1996) https://doi.org/10.1117/12.243234

KEYWORDS: Spectroscopy, Black bodies, Sensors, Reflectivity, Data acquisition, Calibration, Airborne remote sensing, Electronics, Scanners, Mirrors

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Proceedings Article | 23 September 1993 Paper

79-channel airborne imaging spectrometer

Sheng-Huei Chang, Mark Westfield, Frank Lehmann, Dieter Oertel, Rudolf Richter

Proceedings Volume 1937, (1993) https://doi.org/10.1117/12.157053

KEYWORDS: Calibration, Spectroscopy, Sensors, Scanners, Black bodies, Mirrors, Airborne remote sensing, Gyroscopes, Signal to noise ratio, Beam splitters

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Proceedings Article | 1 July 1990 Paper

Evaluation of GER airborne scanner data for environmental applications

Frank Lehmann, H. Rothfuss, Rudolf Richter

Proceedings Volume 1319, (1990) https://doi.org/10.1117/12.34918

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Showing 5 of 12 publications

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