Mr. David J. Thomas Profile

David J. Thomas

Associate Director IGS at US Army RDECOM-TARDEC

SPIE Involvement:

Author

Proceedings Article | 23 May 2011 Paper

High-frequency imaging radar for robotic navigation and situational awareness

David Thomas, Changan Luo, Robert Knox

Proceedings Volume 8045, 804506 (2011) https://doi.org/10.1117/12.885199

KEYWORDS: Radar, Digital signal processing, Robotics, Radar imaging, Sensors, Situational awareness sensors, Antennas, Target detection, Receivers, Imaging systems

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Proceedings Article | 5 August 2004 Paper

RenderView: physics-based rendering of ground vehicles

Denise Talcott, David Thomas, William Reynolds, Roger Evans, Lucas Miller

Proceedings Volume 5431, (2004) https://doi.org/10.1117/12.549096

KEYWORDS: Bidirectional reflectance transmission function, RGB color model, Cameras, Reflectivity, Calibration, Data modeling, Panoramic photography, Sun, Diffuse reflectance spectroscopy, Atmospheric modeling

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Proceedings Article | 5 September 2003 Paper

RenderView: physics-based multi- and hyperspectral rendering using measured background panoramics

Denise Talcott, Wade Brown, David Thomas

Proceedings Volume 5075, (2003) https://doi.org/10.1117/12.492911

KEYWORDS: Panoramic photography, Bidirectional reflectance transmission function, Sun, RGB color model, Electro optical modeling, Calibration, Data modeling, Atmospheric modeling, Scattering, Physics

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Proceedings Article | 6 August 2002 Paper

Modeling, materials, and metrics: the three-m approach to FCS signature solutions

Teresa Gonda, David Thomas, Raju Namburu, Timothy Edwards

Proceedings Volume 4718, (2002) https://doi.org/10.1117/12.478800

KEYWORDS: Fluorescence correlation spectroscopy, Prototyping, Sensors, Infrared signatures, Electro optical modeling, Computer aided design, Thermal modeling, Systems modeling, Visualization, Bidirectional reflectance transmission function

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Proceedings Article | 6 August 2002 Paper

Variability of infrared BRDF for military ground targets

David Thomas, Roger Evans, Alicia Ruba

Proceedings Volume 4718, (2002) https://doi.org/10.1117/12.478811

KEYWORDS: Bidirectional reflectance transmission function, Reflectivity, Data modeling, Infrared radiation, Visualization, Modeling and simulation, Sensors, Databases, Light sources, Near infrared

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Proceedings Article | 6 August 2002 Paper

Ultimate visible band panorama acquisition system

Wade Brown, David Thomas, William Reynolds

Proceedings Volume 4718, (2002) https://doi.org/10.1117/12.478832

KEYWORDS: Panoramic photography, Imaging systems, Visualization, Cameras, Calibration, Camouflage, Sun, Data modeling, Digital cameras, Physics

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Proceedings Article | 24 July 2000 Paper

Trial SNAPSHOT: measurements for terrain background characterization

Marilyn Gilmore, Alistair Mitchell, Christopher Bell, David Thomas, Roger Evans

Proceedings Volume 4029, (2000) https://doi.org/10.1117/12.392545

KEYWORDS: Reflectivity, Sensors, Camouflage, Visible radiation, Spectral resolution, Optical filters, Image intensifiers, Defense and security, Calibration, Image filtering

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The spatial and spectral characteristics of targets and backgrounds must be known and understood for a wide variety of reasons such as: synthetic scene simulation and validation; target description for modelling; in- service target material characterisation and background variability assessment. Without this information it will be impossible to design effective camouflage systems and to maximise the capabilities of new sensors. Laboratory measurements of background materials are insufficient to provide the data required. A series of trials are being undertaken in the UK to quantify both diurnal and seasonal changes of a terrain background, as well as the statistical variability within a scene. These trials are part of a collaborative effort between the Defence Evaluation and Research Agency (UK), Defence Clothing and Textile Agency (UK) and the T.A.C.O.M. (USA). Data are being gathered at a single site consisting primarily of south facing mixed coniferous and deciduous woodland, but also containing uncultivated grassland and tracks. Ideally each point in the scene needs to be characterized at all relevant wavelengths but his is unrealistic. In addition there are a number of important environmental variables that are required. The goal of the measurement programme is to acquire data across the spectrum from 0.4 - 14 microns. Sensors used to include visible band imaging spectroradiometers, telespectroradiometers (visual, NIR, SWIR and LWIR), calibrate colour cameras, broad band SWIR and LWIR imagers and contact reflectance measurement equipment. Targets consist of painted panels with known material properties and a wheeled vehicle, which is in some cases covered with camouflage netting. Measurements have bene made of the background with and without the man- made objects present. This paper will review the results to date and present an analysis of the spectral characteristics fo different surfaces. In addition some consideration will be given to the implications of the data obtained for camouflage design.

Proceedings Article | 14 July 1999 Paper

Theory and measurement of bidirectional reflectance for signature analysis

James Jafolla, David Thomas, John Hilgers, William Reynolds, Chris Blasband

Proceedings Volume 3699, (1999) https://doi.org/10.1117/12.352935

KEYWORDS: Bidirectional reflectance transmission function, Scattering, Data modeling, Reflectivity, Light scattering, Systems modeling, Sensors, Polarization, High dynamic range imaging, Multiple scattering

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Proceedings Article | 7 July 1998 Paper

Surface reflectance variations in realistic targets

David Thomas, Roger Evans, Jim Crosby, James Jafolla

Proceedings Volume 3375, (1998) https://doi.org/10.1117/12.327160

KEYWORDS: Reflectivity, Bidirectional reflectance transmission function, Data modeling, Visualization, Systems modeling, Process modeling, Near infrared, Statistical modeling, Modeling and simulation, Performance modeling

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Proceedings Article | 20 June 1997 Paper

Bidirectional reflectance measurements for high-resolution signature modeling

David Thomas, James Jafolla, Peter Sarman

Proceedings Volume 3062, (1997) https://doi.org/10.1117/12.276667

KEYWORDS: Bidirectional reflectance transmission function, Reflectivity, Sensors, Light sources, Modeling and simulation, Calibration, Data modeling, Scattering, High dynamic range imaging, Light scattering

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