Mr. Larry R. Siegel Profile

Larry R. Siegel

at Lawrence Livermore National Lab

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Author

Publications (3)

Proceedings Article | 8 May 2018 Presentation + Paper

Simulation techniques for image utility analysis

Sanghui Han, John Kerekes , Shawn Higbee, Lawrence Siegel

Proceedings Volume 10644, 106440P (2018) https://doi.org/10.1117/12.2305163

KEYWORDS: Imaging systems, Sensors, Image analysis, Image processing, Image quality, Point spread functions, Digital imaging

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Modeling a space borne imaging system is key in predicting mission utility and exploring the sensor design trade space. It is important to capture critical real world phenomena in the modeling as accurately as possible to optimize design parameters. As a step toward optimal design of spectral imaging systems, this work presents simulation techniques that were used to model a panchromatic imaging system and predict well-known image quality metrics for a range of values of a key optical design variable - the effective focal length (EFL).We designed a at desert scene that included 7% and 15% reflectance panels and generated simulated images for a range of EFLs. The panels were used to calculate a sensor signal-to-noise ratio (SNR). The simulation incorporated a summer atmosphere with a collection time and geometry set to produce zenith solar and nadir collection angles. Platform motion and height with a given integration time for known detector parameters were also incorporated to produce images with changing EFL. A point spread function (PSF) of a typical optical system was incorporated that was scaled according to the EFL for a constant aperture diameter in order to capture the optical resolution changes. The PSF along with smear from the platform motion and integration time introduced realistic image blur to enable the relative edge response (RER) for the system to be estimated from the simulated images. The simulation used the Digital Imaging and Remote Sensing Image Generation (DIRSIG) model that incorporates ray-tracing techniques and physics based radiation propagation modules. The SNR, RER, and GSD calculated from the synthetic images were used to estimate the National Imagery Interpretability Rating Scale (NIIRS) rating for a range of EFLs. An optimum EFL was found by this process which included the compensating effects of resolution, sampling, and noise as the EFL changed. This technique is currently being expanded to assess trades for sensor design in order to optimize optical payload designs for multispectral and hyperspectral imaging systems.

Proceedings Article | 28 September 1994 Paper

New developments in optical correction for nonspherical windows and domes

Robert Fischer, Lawrence Siegel, Ronald Korniski, Ellis Boudreaux

Proceedings Volume 2286, (1994) https://doi.org/10.1117/12.187367

KEYWORDS: Domes, Diffraction, Binary data, Diffraction gratings, Optical calibration, Diffractive optical elements, Optical aberrations, Missiles, Nose, Wavefronts

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Proceedings Article | 1 September 1990 Paper

Multiwavelength Scophony infrared scene projector

James Killius, Brent Elder, Lawrence Siegel, Michael Allweiss

Proceedings Volume 1311, (1990) https://doi.org/10.1117/12.21844

KEYWORDS: Modulation, Acousto-optics, Adaptive optics, Modulators, Projection systems, Infrared radiation, Control systems, Scanners, Infrared imaging, Image resolution

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