Mr. Timothy Perkins Profile

Timothy Perkins

at Spectral Sciences Inc

SPIE Involvement:

Author

Publications (10)

Proceedings Article | 1 November 2024 Presentation + Paper

Spectral-spatial ground targets for measurement of airborne electro-optical imaging system performance

Robert Sundberg, James Grassi, Michael Kogan, Cory Garms, Paul Corlies, Neil Goldstein, Bridget Tannian, Megan Stark, Marsha Fox, Timothy Perkins, Ronald Hardgrove, Karapet Gyurjyan, Steven Santaniello, Todd Christensen, Vu Hoang

Proceedings Volume 13200, 132000U (2024) https://doi.org/10.1117/12.3030794

KEYWORDS: Modulation transfer functions, Cameras, Temperature metrology, Sensors, Tunable filters, Imaging systems, Long wavelength infrared, Diffusers, Design, Reflectivity

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Targets located on the Precision Impact Range Area (PIRA) of Edwards AFB are used to evaluate imaging systems’ sensitivity and spatial resolution to ensure they meet specified requirements. Spectral Sciences, Inc., is developing a field-ready electro-optical sensor calibration/test system for airborne instruments from the visible through longwave infrared. This spectral region is particularly challenging because of the contributions from both solar and thermal fluxes. The system is composed of spectral-spatial ground targets and atmospheric characterization instruments. The design challenges for a new ground target installation applicable over short to long ranges and a broad optical spectrum include: 1) development of an innovative spectral-spatial, high contrast, high uniformity, knife edge target for determination of the spatial characteristics of the imaging system under test, such as the Modulation Transfer Function (MTF) and Relative Edge Response (RER), Noise Equivalent Temperature Difference (NETD), linearity and more; 2) development and implementation of a suite of auxiliary instruments to quantify the atmospheric effects, such as line-of-sight (LOS) turbulence, surface temperatures, humidity, and visibility; 3) development of targets with stable, quantifiable spectral response that can be used for evaluation for the spectral characteristics of multi- or hyperspectral imaging systems; and 4) engineering the target set for simplified long-term maintenance and durability. In this paper we report on the development of a prototype 2m by 2m thermally controlled knife edge target. The target is composed of four 1m by 1m panels each of which has independent temperature control and face surface materials which can be exchanged with other panel faces to produce patterns or spectral features. The full prototype system can be rotated and tipped to maximize the surface area apparent to a sensor system under test. The paper includes initial field measurements of the target array using visible, MWIR and LWIR imaging systems.

Proceedings Article | 3 October 2022 Presentation

Target detection modeling under poorly illuminated conditions

Sandra Wiseman, Robert Sundberg, Timothy Perkins

Proceedings Volume 12235, 122350D (2022) https://doi.org/10.1117/12.2633598

KEYWORDS: Target detection, Atmospheric modeling, Monte Carlo methods, Image segmentation, Signal to noise ratio, Scattering, Target acquisition, Signal detection, Sensors, Sensor performance

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Proceedings Article | 8 May 2018 Presentation + Paper

Atmospheric correction of commercial thermal infrared hyperspectral imagery using FLAASH-IR

Steven Adler-Golden, Nevzat Guler, Timothy Perkins

Proceedings Volume 10644, 106440U (2018) https://doi.org/10.1117/12.2305146

KEYWORDS: Sensors, Atmospheric corrections, Long wavelength infrared, Spectral resolution, Infrared imaging, Infrared radiation, Hyperspectral imaging, Atmospheric modeling, Infrared sensors

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Proceedings Article | 17 May 2016 Paper

Spectral BRDF modeling of vehicle signature observations in the VNIR-SWIR

T. Perkins, S. Adler-Golden, L. Muratov, R. Sundberg, E. Ientilucci, L. Cain

Proceedings Volume 9840, 98400R (2016) https://doi.org/10.1117/12.2225018

KEYWORDS: Reflectivity, Bidirectional reflectance transmission function, 3D modeling, Target detection, RGB color model, Sensors, Hyperspectral imaging, Calibration, Spectral models, Infrared imaging

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Proceedings Article | 13 June 2014 Paper

MODTRAN6: a major upgrade of the MODTRAN radiative transfer code

Alexander Berk, Patrick Conforti, Rosemary Kennett, Timothy Perkins, Frederick Hawes, Jeannette van den Bosch

Proceedings Volume 9088, 90880H (2014) https://doi.org/10.1117/12.2050433

KEYWORDS: Aerosols, Interfaces, Atmospheric modeling, Scattering, Atmospheric particles, Radiative transfer, Computer programming, Refractive index, Transmittance, Physics

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SPIE Journal Paper | 13 June 2012

Speed and accuracy improvements in FLAASH atmospheric correction of hyperspectral imagery

Timothy Perkins, Steven Adler-Golden, Michael Matthew, Alexander Berk, Lawrence Bernstein, Jamine Lee, Marsha Fox

OE, Vol. 51, Issue 11, 111707, (June 2012) https://doi.org/10.1117/12.10.1117/1.OE.51.11.111707

KEYWORDS: Atmospheric corrections, Aerosols, Atmospheric modeling, Visibility, Reflectivity, Atmospheric particles, Sensors, Image processing, Absorption, Point spread functions

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Proceedings Article | 15 May 2012 Paper

High-speed atmospheric correction for spectral image processing

Timothy Perkins, Steven Adler-Golden, Patrice Cappelaere, Daniel Mandl

Proceedings Volume 8390, 83900V (2012) https://doi.org/10.1117/12.918908

KEYWORDS: Atmospheric corrections, Sensors, Atmospheric monitoring, Atmospheric particles, Image processing, Reflectivity, Aerosols, Atmospheric modeling, Hyperspectral imaging, Alternate lighting of surfaces

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Proceedings Article | 16 May 2006 Paper

Real-time target motion animation for missile warning system testing

Timothy Perkins, Robert Sundberg, John Cordell, Zaw Tun, Mark Owen

Proceedings Volume 6208, 62080E (2006) https://doi.org/10.1117/12.661261

KEYWORDS: Visualization, Sensors, Missiles, Bidirectional reflectance transmission function, Signal attenuation, Projection systems, Atmospheric modeling, 3D modeling, Computer simulations, Reflectivity

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Proceedings Article | 1 November 2005 Paper

Retrieval of atmospheric properties from hyper and multispectral imagery with the FLAASH atmospheric correction algorithm

Timothy Perkins, Steven Adler-Golden, Michael Matthew, Alexander Berk, Gail Anderson, James Gardner, Gerald Felde

Proceedings Volume 5979, 59790E (2005) https://doi.org/10.1117/12.626526

KEYWORDS: Reflectivity, Atmospheric corrections, Atmospheric modeling, Visibility, Sensors, Aerosols, Calibration, Atmospheric sensing, Absorption, Atmospheric particles

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Proceedings Article | 1 June 2005 Paper

Validation of the QUick atmospheric correction (QUAC) algorithm for VNIR-SWIR multi- and hyperspectral imagery

Lawrence Bernstein, Steven Adler-Golden, Robert Sundberg, Robert Levine, Timothy Perkins, Alexander Berk, Anthony Ratkowski, Gerald Felde, Michael Hoke

Proceedings Volume 5806, (2005) https://doi.org/10.1117/12.603359

KEYWORDS: Aerosols, Reflectivity, Atmospheric corrections, Atmospheric particles, Atmospheric modeling, Sensors, Visibility, Hyperspectral imaging, Multispectral imaging, Atmospheric physics

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Showing 5 of 10 publications

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