| A Nonparametric Approach to Segmentation of Ladar Images |
Dec 2012 |
160 pages |
| Authors:
Eric A Buschelman; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
 | The advent of advanced laser radar (ladar) systems that record full-waveform signal data has inspired numerous inquisitions which aspire to extract additional, previously unavailable, information about the illuminated scene from the collected data. The quality of the information, however, is often related to the limitations of the ladar camera used to collect the data. This research project uses full-waveform analysis of ladar signals, and basic principles of optics, to propose ... |
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| Matrix Determination of Reflectance of Hidden Object via Indirect Photography |
Mar 2012 |
69 pages |
| Authors:
Simon S Ferrel; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
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| Indirect photography is a recently demonstrated technique that expands on the principles of dual photography and allows for the imaging of hidden objects. A camera and light source are collocated with neither having line-of-sight access to the hidden object. Light from the source, a laser, is reflected off a visible non-specular surface onto the hidden object, where it is reflected back to the initial non-specular surface and collected by the ... |
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| Dynamic Vision for Control |
18 Feb 2012 |
13 pages |
| Authors:
Stefano Soatto; CALIFORNIA UNIV LOS ANGELES VISION LAB
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| We have developed a comprehensive set of analytical and computational tools to exploit visual data for the purpose of control and interaction with complex, dynamic and uncertain environments. The accomplishment of the goals set forth in the original proposal was articulated into three parallel research tracks. (1) Tracking; focused on the establishment of correspondence of low-level statistics across temporal samples, including the development of representations that are invariant to local ... |
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| Assessment of a Bidirectional Reflectance Distribution Correction of Above-Water and Satellite Water-Leaving Radiance in Coastal Waters |
10 Jan 2012 |
19 pages |
| Authors:
Soe Hlaing; Alexander Gilerson; Tristan Harmal; Alberto Tonizzo; Alan Weidemann; Robert Arnone; Samir Ahmed; NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
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| Water-leaving radiances, retrieved from in situ or satellite measurements, need to be corrected for the bidirectional properties of the measured light in order to standardize the data and make them comparable with each other. The current operational algorithm for the correction of bidirectional effects from the satellite ocean color data is optimized for typical oceanic waters. However, versions of bidirectional reflectance correction algorithms specifically tuned for typical coastal waters and ... |
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| Exploring the Effect of Illumination on Automatic Expression Recognition using the ICT-3DRFE Database |
04 Nov 2011 |
11 pages |
| Authors:
Giota Stratou; Abhijeet Ghosh; Paul Debevec; Louis-Philippe Morency; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES INST FOR CREATIVE TECHNOLOGIES
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| One of the main challenges in facial expression recognition is illumination invariance. Our long-term goal is to develop a system for automatic facial expression recognition that is robust to light variations. In this paper, we introduce a novel 3D Relightable Facial Expression (ICT-3DRFE) database that enables experimentation in the fields of both computer graphics and computer vision. The database contains 3D models for 23 subjects and 15 expressions, as well ... |
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| Evaluation of High Efficiency LED Lighting |
02 Nov 2011 |
20 pages |
| Authors:
John Sullivan; ARMY NATICK SOLDIER RESEARCH DEVELOPMENT AND ENGINEERING CENTER MA
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| CdTe-based Light-Controllable Frequency-Selective Photonic Crystal Switch for Millimeter Waves |
Sep 2011 |
32 pages |
| Authors:
Vladimir B Yurchenko; NATIONAL UNIV OF IRELAND MAYNOOTH (IRELAND)
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| Frequency-selective mm-wave photonic-crystal (PC) beam switches of increased sensitivity for rapid turning off and on quasi-optical beams in response to light pulses as control signals have been designed, manufactured and experimentally tested. Light-controllable PC-enhanced devices using semiconductor wafers (semi-insulating GaAs and Si layers or CdTe-coated quartz plates) with special surface patterning will provide additional functionality for mm-wave beam processing, with sensitivity improved, according to simulations, by 2 to 4 orders ... |
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| Motion Sickness Prevention by 8 Hz Stroboscopic Environment during Actual Air Transport |
Sep 2011 |
49 pages |
| Authors:
Catherine M Webb; Arthur Estrada; Jeremy R Athy; Melody R King; ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
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| Previous research has shown that retinal slip can be a significant factor in causing motion sickness. Stroboscopic illumination is believed to prevent retinal slip by providing snapshots of the visual environment that are brief enough so each image is stationary on the retina. The purpose of this study was to determine the effectiveness of an 8 Hz stroboscopic environment as a motion sickness countermeasure during a nauseogenic flight in a ... |
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| Sky Glow from Cities: The Army Illumination Model v2 |
Sep 2011 |
48 pages |
| Authors:
Richard C Shirkey; ARMY RESEARCH LAB WHITE SANDS MISSILE RANGE NM
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| The increasing number of people living on earth and the corresponding increase in outdoor lighting has resulted in light pollution a brightening night sky that has obliterated the stars for much of the world s population. However, for military purposes, in particular Night Vision Goggle (NVG) users, this light can allow for detection of targets that might ordinarily not be seen. The amount of light scattered from an urban location ... |
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| Human Factors Engineering Testing of Aircraft Cockpit Lighting Systems |
15 JUL 2011 |
37 pages |
| Authors:
REDSTONE TEST CENTER FORT RUCKER AL ARMY AVIATION FLIGHT TEST DIRECTORATE
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| This TOP outlines the procedures for testing human factors engineering aspects of cockpit lighting and the methodology involved in quantifying, qualifying, and presenting data for cockpit lighting. Cockpit lighting characteristics testing outlined in this TOP include display luminance, illuminance, contrast, balance, uniformity, sunlight readability, display color, night vision imaging system compatibility, and crewstation reflections. |
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| Quest Hierarchy for Hyperspectral Face Recognition |
MAR 2011 |
229 pages |
| Authors:
David M. Ryer; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| Face recognition is an attractive biometric due to the ease in which photographs of the human face can be acquired and processed. The non-intrusive ability of many surveillance systems permits face recognition applications to be used in a myriad of environments. Despite decades of impressive research in this area, face recognition still struggles with variations in illumination, pose and expression not to mention the larger challenge of willful circumvention. The ... |
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| Demonstration of a Polarimeter in a Pixel |
15 Feb 2011 |
10 pages |
| Authors:
Sanjay Krishna; NEW MEXICO UNIV ALBUQUERQUE CENTER FOR HIGH TECHNOLOGY MATERIALS
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| The aim of the proposed project is to realize a novel optoelectronic device that completely and instantaneously measures the incident light's polarization for a narrow wavelength band in a single physical pixel. The device uses interference among many light paths to encode in four photocurrents four values that completely describe the polarization state of the incident light at a given wavelength. It is to be emphasized that the polarization information ... |
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| Optics of Spider Sticky Orb Webs |
Jan 2011 |
16 pages |
| Authors:
Deb M Kane; Gregory R Staib; Nishen Naidoo; Douglas J Little; Marie E Herberstein; MACQUARIE UNIV SYDNEY (AUSTRALIA)
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| Spider orb webs are known to produce colour displays in nature, both in reflection and transmission of sunlight, under certain illumination conditions. The cause of these colours has been the subject of speculation since the time of Newton. It has also been the topic of observational interpretation and some experiment which has proposed diffraction by the fine silks, scattering from rough/structured surfaces and thin film effects as the primary causes. ... |
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| Understanding and Recreating Visual Appearance Under Natural Illumination |
Jan 2011 |
233 pages |
| Authors:
Jean-Francois Lalonde; CARNEGIE-MELLON UNIV PITTSBURGH PA ROBOTICS INST
|
| The appearance of an outdoor scene is determined to a great extent by the prevailing illumination conditions. However, most practical computer vision applications treat illumination more as a nuisance rather than a source of signal. In this dissertation, we suggest that we should instead embrace illumination, even in the challenging, uncontrolled world of consumer photographs. Our first main contribution is an understanding of natural illumination from images. This is, in ... |
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| Atmospheric Polarization Imaging with Variable Aerosols and Clouds |
10 Dec 2010 |
19 pages |
| Authors:
Joseph A Shaw; MONTANA STATE UNIV BOZEMAN
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| An all-sky polarization spectral imager developed under prior support was deployed along with an atmospheric lidar, a sun-tracking multi-channel solar radiometer, an infrared cloud imager, and a variety of ground-based aerosol sensors to study the effect of variable clouds and aerosols on skylight polarization in the 450 780 nm spectral region. Near the end the performance period the imaging polarization imager was re-engineered to operate in an autonomous manner outdoors ... |
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| From the Rendering Equation to Stratified Light Transport Inversion |
09 Dec 2010 |
33 pages |
| Authors:
Tian-Tsong Ng; Ramanpreet S Pahwa; Jiamin Bai; Kar-Han Tan; Ravi Ramamoorthi; CALIFORNIA UNIV BERKELEY DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| Recent advances in fast light transport acquisition have motivated new applications for forward and inverse light transport. While forward light transport enables image relighting, inverse light transport provides new possibilities for analyzing and cancelling interreflections, to enable applications like projector radiometric compensation and light bounce separation. With known scene geometry and diffuse reflectance, inverse light transport can be easily derived in closed form. However with unknown scene geometry and reflectance ... |
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| WHITE-LIGHT SAGNAC INTERFEROMETER FOR SNAPSHOT POLARIMETRIC AND MULTISPECTRAL IMAGING |
15 Mar 2010 |
12 pages |
| Authors:
Michael W Kudenov; Matthew E Jungwirth; Eustace L Dereniak; Grant R Gerhart; ARIZONA UNIV TUCSON OPTICAL SCIENCES CENTER
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| A common technique, referred to as channeled imaging polarimetry (ClP), enables the snapshot acquisition of the 2- dimensional Stokes parameters of an arbitrary scene or sample. It achieves this by amplitude modulating the Stokes parameters onto various interference-based spatial carrier frequencies. While this technique has utility. it often suffers from low signal-lo-noise ratios, in remote sensing scenarios. due to its requirement of narrow spectral bandwidth illumination 3 nm in the ... |
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| Light-Controlled Self-Assembly of Semiconductor Nanoparticles into Twisted Ribbons |
12 Mar 2010 |
7 pages |
| Authors:
Sudhanshu Srivastava; Aaron Santos; Kevin Critchley; Ki-Sub Kim; Paul Podsiadlo; Kai Sun; Jaebeom Lee; Chuanlai Xu; G D Lilly; Sharon C Glotzer; MICHIGAN UNIV ANN ARBOR DEPT OF CHEMICAL ENGINEERING
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| The collective properties of nanoparticles manifest in their ability to self-organize into complex microscale structures. Slow oxidation of tellurium ions in cadmium telluride (CdTe) nanoparticles results in the assembly of 1- to 4-micrometer-long flat ribbons made of several layers of individual cadmium sulfide (CdS)/CdTe nanocrystals. Twisting of the ribbons with an equal distribution of left and right helices was induced by illumination with visible light. The pitch lengths (250 to ... |
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| The First Detection of (OIV) from an Ultraluminous X-Ray Source with Spitzer.I. Observational Results for Holmberg II ULX |
11 DEC 2009 |
12 pages |
| Authors:
C. T. Berghea; R. P. Dudik; K. A. Weaver; T. R. Kallman; NAVAL OBSERVATORY WASHINGTON DC
|
| We present the first Spitzer Infrared Spectrograph observations of the [O IV] 25.89 emission line detected from the ultraluminous X-ray source (ULX) in Holmberg II. This line is a well-established signature of high excitation, usually associated with active galactic nucleus (AGN). Its detection suggests that the ULX has a strong impact on the surrounding gas. A Spitzer high-resolution spectral map shows that the [O IV] is coincident with the X-ray ... |
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| Institute for Brain and Neural Systems |
06-Oct-2009 |
55 pages |
| Authors:
Leon N Cooper; BROWN UNIV PROVIDENCE RI
|
| Detection and identification of partially occluded targets in complex scenes becomes an increasingly important task in light of the latest developments in urban warfare. The construction of a system that can automatically identify selected targets or direct soldiers attention to the locations that may contain suspicious activity can be of great use not only as a tool that can reduce the cognitive workload of the soldier but also as a ... |
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| Motion Sickness Prevention by Stroboscopic Environment during Simulated Military Transport |
20-Jul-2009 |
30 pages |
| Authors:
Catherine M Webb; Arthur Estrada; Jeremy R Athy; Edna Rath; Melody King; Brad Bumgardner; ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
|
| Previous studies have shown stroboscopic illumination to reduce the severity of motion sickness symptoms when retinal slip is a significant factor. The present study assessed the use of a 4 and an 8 Hz stroboscopic environment as a countermeasure for visually-induced motion sickness. The motion profiles of an Army UH-60 Black Hawk helicopter and a Marine AAVC7A1 Amphibious Assault Vehicle were produced using the U.S. Army Aeromedical Research Laboratory's Multi ... |
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| Biology and Ecology of Sand Flies (Diptera: Psychodidae) in the Middle East, with Special Emphasis on Phlebotomus Papatasi and Phlebotomus Alexandri |
06 MAR 2009 |
174 pages |
| Authors:
Michelle G. Colacicco-Mayhugh; UNIFORMED SERVICES UNIV OF THE HEALTH SCIENCES BETHESDA MD F EDWARD HEBERT SCHOOL OF MEDICINE
|
| The overall goal of the research presented here is to further the understanding of sand fly biology and ecology in the Middle East region. In order to accomplish this goal, four studies were developed. The first study examined the effect of climate on sand fly activity. Sand fly collection and meteorological data from Tallil, Iraq from 2003 - 2004 were used in this multivariate analysis. Moon illumination, wind speed, and ... |
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| Identification of Text and Symbols on a Liquid Crystal Display Part III: The Effect of Ambient Light, Colour and Size |
Feb-2009 |
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| Authors:
Kingsley Fletcher; Stuart Sutherland; Karen Nugent; Michelle Grech; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) MARITIME OPERATIONS DIV
|
 | This study aimed to identify the minimum font size that supports fast and accurate identification of text and symbols displayed on an LCD under ambient lighting conditions similar to those in naval ships' operations rooms. A series of letters, numbers and combat symbols were displayed on an LCD for either 106 ms or 173 ms. Participants were asked to identify each stimulus and the certainty of their decision. Letters and ... |
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| Identification of Text and Symbols on a Liquid Crystal Display. Part 2. Contrast and Luminance Settings to Optimise Legibility |
Feb-2009 |
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| Authors:
Kingsley Fletcher; Stuart Sutherland; Karen Nugent; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) MARITIME OPERATIONS DIV
|
| This study aimed to identify the luminance and contrast levels necessary to minimise the threshold identification size of bright letters displayed over a dark background on an LCD under low (1.5 lux) and high (260 lux) lighting conditions. White, pure red, pure green and pure blue upper-case Bailey Lovie letters with a contrast between 3:1 and 300:1 were displayed on an LCD to 20 participants. The threshold identification size was ... |
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| Identification of Text and Symbols on a Liquid Crystal Display Part I: Characterisation of the Luminance, Temporal and Spectral Characteristics |
Feb-2009 |
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| Authors:
Kingsley Fletcher; Stuart Sutherland; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) MARITIME OPERATIONS DIV
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| This report outlines the measurements performed on an Apple M9179LL/A 30' 2560 x 1600 LCD panel to establish its luminance response function, luminance uniformity, luminance temporal stability, response time and spectral characteristics. The results of this report were used in subsequent reports (Fletcher, Sutherland, & Nugent, in press; Fletcher, Sutherland, Nugent, & Grech, in press) which examined the minimum character size that allowed for fast and accurate identification of numbers, ... |
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| Short-Wavelength Countermeasures for Circadian Desynchrony |
30-Jun-2008 |
6 pages |
| Authors:
H C Heller; Mark Smith; STANFORD UNIV CA DEPT OF BIOLOGY
|
| Exposure to light at critical phases of the circadian cycle entrains circadian rhythms. Exposure of humans to bright light for an hour or more at the right phase of the circadian cycle produces significant phase shifts of circadian rhythms speeding recovery from jet-lag, and optimizing cognitive functionality and restorative sleep. Our work on mice produced the unexpected result that exposure to intermittent millisecond flashes of light distributed over an hour ... |
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| Laser Illumination of Aircraft by Geographic Location for a 3-Year Period (2004-2006) |
JUN 2008 |
18 pages |
| Authors:
Van B. Nakagawara; Ron W. Montgomery; Kathry J. Wood; FEDERAL AVIATION ADMINISTRATION OKLAHOMA CITY OK CIVIL AEROSPACE MEDICAL INST
|
| Incidents involving laser illumination of aircraft in the National Airspace System have raised concerns within the aviation community for more than a decade. The principal concern is the visual effect laser illumination may have on flight crew performance during terminal operations, such as landing and departure maneuvers, when operational activities are extremely critical. This 3-year study examines the frequency and rate of aviation-related laser incidents by year and location. Incident ... |
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| MEMS based Optical Limiter (PREPRINT) |
28-Jan-2008 |
15 pages |
| Authors:
Bahareh Haji-saeed; Jed Khoury; John Kierstead; William D Goodhue; Charles L Woods; AIR FORCE RESEARCH LAB HANSCOM AFB MA OPTOELECTRONIC TECHNOLOGY BRANCH
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| In this paper we propose the design of a MEMS-deformable-mirror based optical limiter. The design is based on aperturing focused light reflected out of an optically driven deformable mirror, deformed in a parabolic form. We derived an expression for the reflected light intensity and we showed that the reflected light saturates as a function of back illumination light intensity. |
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| Spatially Resolved Photocurrent Mapping of Operating Organic Photovoltaic Devices Using Atomic Force Photovoltaic Microscopy |
Jan-2008 |
7 pages |
| Authors:
B J Leever; M F Durstock; M D Irwin; A W Hains; T J Marks; L S Pingree; M C Hersam; NORTHWESTERN UNIV EVANSTON IL OFFICE OF RESEARCH SPONSORED PROJECTS
|
| A conductive atomic force microscopy (cAFM) technique, atomic force photovoltaic microscopy (AFPM), has been developed to characterize spatially localized inhomogeneities in organic photovoltaic (OPV) devices. In AFPM, a biased cAFM probe is raster scanned over an array of illuminated solar cells, simultaneously generating topographic and photocurrent maps. As proof of principle, AFPM is used to characterize OPVs, revealing substantial device to device and temporal variations in the short-circuit current. The ... |
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| Enhanced Direct-Drive Implosions with Thin High-Z Ablation Layers |
2008 |
17 pages |
| Authors:
Andrew N. Mostovych; Denis G. Colombant; Max Karasik; James P. Krauer; Andrew J. Schmitt; James L. Weaver; NAVAL RESEARCH LAB WASHINGTON DC PLASMA PHYSICS DIV
|
| New direct-drive spherical implosion experiments with deuterium filled plastic shells have demonstrated significant and absolute (2x) improvements in neutron yield when the shells are coated with a very thin layer (~200-400 Angstron) of high-Z material such as palladium. This improvement is interpreted as resulting from increased stability of the imploding shell. These results provide for a possible path to control laser imprint and stability in laser-fusion-energy target designs. |
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| A Preliminary Urban Illumination Model |
NOV 2007 |
28 pages |
| Authors:
Richard C. Shirkey; ARMY RESEARCH LAB WHITE SANDS MISSILE RANGE NM
|
| The Army increasingly relies on night operations to accomplish it objectives. These night operations frequently require using night vision goggles and other light-sensitive devices, which are strongly affected by ambient lighting, a large component of which is urban. A preliminary urban illumination model is presented for use in tactical decision aids and wargames, which would allow for more accurate prediction of target acquisition ranges and increased realism in simulations. This ... |
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| Free Space Measured Loss Comparison of Single and Double Ring Resonators for Negative Index Media |
14 SEP 2007 |
6 pages |
| Authors:
John S. Derov; Beverly W. Turchinetz; James W. Dean; Everett E. Crisman; Alvin J. Drehman; AIR FORCE RESEARCH LAB HANSCOM AFB MA SENSORS DIRECTORATE
|
| Since the first demonstration of negative refractive index using nested or edge coupled split ring resonators and posts, various proposals have been made for improvement of the structures. Loss is an ongoing concern for these media at microwave frequencies and above. One alternate design uses broadside coupled split rings printed front to back on a substrate. This approach, which avoids bianisotropic effects of edge coupled rings, has been demonstrated successfully ... |
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| An Infrared Camera Simulation for Estimating Spatial Temperature Profiles and Signal-to-Noise Ratios of an Airborne Laser-Illuminated Target |
JUN 2007 |
129 pages |
| Authors:
David F. Orth; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Airborne Laser testing and evaluation can be aided by developing a spectrally-based infrared camera simulation to explore how the target surface's specular and diffuse reflectivities affect the observed signal-to-noise ratio (SNR) and how the target's temperature in the laser spot can estimated. This simulation provides for the observed irradiance, scaled by atmospheric absorption, to consist of the target's self-emission, reflected background emission, and the path emission from the observer to ... |
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| Parametric Study of Beta-Endpoint Energy in Direct Energy Converters |
JAN 2007 |
62 pages |
| Authors:
Kara Blaine; Marc Litz; ARMY RESEARCH LAB ADELPHI MD
|
| Several solid-state materials have been identified for potential use as direct-energy-converter (DEC) for isotope-based batteries. Numerical simulations, using a nuclear scattering code (MCNPX), have been performed to determine the electron energy deposited in the material. Two different parametric studies were performed 1) varying Beta-endpoint energy of a spectrum illuminating layers of silicon-carbide (SiC), 2) the other varying the material layers while keeping the Beta-endpoint energy constant. The goal of the ... |
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| Real-Time Fusion of Image and Inertial Sensors for Navigation |
2007 |
13 pages |
| Authors:
J. Fletcher; M. Veth; J. Raquet; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| As evidenced by many biological systems, the fusion of optical and inertial sensors represents an attractive method for passive navigation. In our previous work, a rigorous theory for optical and inertial fusion was developed for precision navigation applications. The theory was based on a statistical transformation of the feature space based on inertial sensor measurements. The transformation effectively constrained the feature correspondence search to a given level of a priori ... |
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| Laser Plasma Instability Experiments with KrF Lasers |
2007 |
40 pages |
| Authors:
J. L. Weaver; J. Oh; B. Afeyan; L. Phillips; J. Seely; U. Feldman; C. Brown; Karasik M.; V. Serlin; Y. Aglitskiy; A. N. Mostovych; NAVAL RESEARCH LAB WASHINGTON DC PLASMA PHYSICS DIV
|
| Deleterious effects of laser-plasma instability (LPI) may limit the maximum laser irradiation that can be used for inertial confinement fusion. The short wavelength (248 nm), large bandwidth, and very uniform illumination available with krypton-fluoride (KrF) lasers should increase the maximum usable intensity by suppressing LPI. The concomitant increase in ablation pressure would allow implosion of low aspect ratio pellets to ignition with substantial gain (>20) at much reduced laser energy. ... |
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| Digital Imaging and Analysis of Particulate Contamination |
15 DEC 2006 |
23 pages |
| Authors:
K. T. Luey; D. P. Taylor; D. J. Coleman; K. A. Folgner; AEROSPACE CORP EL SEGUNDO CA
|
| The use of digital cameras and digital imaging software for the measurement of particle obscuration is discussed. Novel calibration standards are used to evaluate the sensitivity and accuracy of commercially available digital cameras for detecting microscopic dust particles and other contaminant features on surfaces. Lighting and illumination effects are also illustrated and discussed. The digital image histogram of particles on a surface is shown to give good results for the ... |
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| Iterative Redeployment of Illumination and Sensing (IRIS): Application to STW-SAR Imaging |
01 NOV 2006 |
8 pages |
| Authors:
Jay Marble; Raviv Raich; Alfred O. Hero; ARMY NIGHT VISION LAB FORT BELVOIR VA
|
| A new technique which we call Iterative Redeployment of Illumination and Sensing (IRIS) is introduced and applied to See-Through-the-Wall radar imaging. IRIS is applicable to adaptive sensing scenarios where the medium is illuminated and measured multiple times using different illuminator/sensor configurations, e.g., position, bandwidth, or polarization. These configurations are adaptively selected to minimize uncertainty in the image reconstruction. The IRIS algorithm has the following features: (1) use of a sparse ... |
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| Multivariate PEM/FT Spectrometry: Intrinsic Data Fusion And Applications for IED and CB Defense |
01-Nov-2006 |
9 pages |
| Authors:
Tudor N Buican; Arthur H Carrieri; SEMIOTIC ENGINEERING ASSOCIATES LLC ALBUQUERQUE NM
|
| We present recent developments in the theory of a new class of active multivariate FT spectrometers and describe their potential uses in the optical detection and identification of improvised explosive devices (IEDs) and CB agents and contaminants. This technology is based on the use of dual ultra-high-speed (UHS) birefringence interferometers for the simultaneous and independent modulation of both illumination and collected beams, and employs photoelastic modulators (PEM) as the birefringent ... |
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| Physics-Based Stimulation for Night Vision Goggle Simulation |
NOV 2006 |
64 pages |
| Authors:
Jeff Clark; RENAISSANCE SCIENCES CORPORATION CHANDLER AZ
|
| Attempts at devising training simulator out-the-window "night time" displays that can be effectively used by a night vision goggle (NVG)- wearing trainee have yielded NVG display systems of questionable fidelity, stability, and/or repeatability. The "physics-based" approach reported here first characterizes a display in terms of its absolute dynamic output range for night vision imaging system (NVIS) radiance and then, using that characterization, maps, as possible, to-be-displayed NVIS radiance values of ... |
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| Relighting Character Motion for Photoreal Simulations |
NOV 2006 |
9 pages |
| Authors:
Bruce Lamond; Charles-Felix Chabert; Per Einarsson; Andrew Jones; Wan-Chun Ma; Tim Hawkins; Mark Bolas; Sebastian Sylwan; Paul Debevec; UNIVERSITY OF SOUTHERN CALIFORNIA MARINA DEL REY CA INST FOR CREATIVE TECHNOLOGIES
|
| We present a fully image-based approach for capturing and modeling real human locomotion under varying illumination and viewpoint that overviews the techniques and results presented by [Einarsson et al, 2006]. An actor performs repeatable locomotive actions (walking/running) on a rotating treadmill while being filmed from a vertical array of 3 high-speed cameras under controlled rapidly changing lighting conditions. The known rotation of the treadmill, repeatability of the actor's motion, timing ... |
|
| Assessment of an Active Electromagnetic Sensor for Hunting Buried Naval Mines, Part II |
Sep-2006 |
9 pages |
| Authors:
P J Carroll; W M Wynn; J W Purpura; NAVAL SURFACE WARFARE CENTER PANAMA CITY FL
|
| The US Navy is investigating the use of broadband electromagnetic (EM) sensors as a candidate technology for its Buried Minehunting (BMH) sensor suite. New Navy tactics are being pursued, where short-range sensors are incorporated into reacquisition minehunting systems for short-range classification. The current approach includes study of use of active EM sensors that employ multi-frequency sources for target illumination which can provide valuable multi-spectral discrimination for the classification of buried ... |
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| Effect of Using High Signal-to-Noise Image Intensifier Tubes on Night Vision Goggle (NVG) Aided Visual Acuity |
MAY 2006 |
67 pages |
| Authors:
Keith D. Higginbotham; ARIZONA STATE UNIV TEMPE
|
| A night vision goggle (NVG) image intensifier (I2) tube's signal-to-noise ratio (SNR) determines the low-light resolution capability, therefore, the higher the SNR, the better the ability of the tube to resolve objects under low illumination conditions. Two NVG models were used to determine if visual performance would improve as a result of a goggle's higher SNR characteristic. The F4949G-TG goggles, equipped with 12 tubes utilizing thin-filmed technology allowing for a ... |
|
| Terahertz Imaging of Subjects With Concealed Weapons |
MAY 2006 |
13 pages |
| Authors:
Jason C. Dickinson; Thoms M. Goyette; Andrew J. Gatesman; Cecil S. Joseph; Zachary G. Root; Robert H. Giles; Jerry Waldman; William E. Nixon; MASSACHUSETTS UNIV LOWELL
|
| In response to the growing interest in developing terahertz imaging systems for concealed weapons detection, the Submillimeter-Wave Technology Laboratory (STL) at the University of Massachusetts Lowell has produced full-body terahertz imagery using coherent active radar measurement techniques. The proof-of-principle results were readily obtained utilizing the compact radar range resources at STL. Two contrasting techniques were used to collect the imagery. Both methods made use of in-house transceivers, consisting of two ... |
|
| Low Noise Simultaneous Fluorescence Detection of Two Atomic States (PREPRINT) |
05 APR 2006 |
5 pages |
| Authors:
M. T. Cashen; J. B. Fixler; G. W. Biedermann; M. A. Kasevich; STANFORD UNIV CA DEPT OF PHYSICS
|
| We have demonstrated a new technique for fluorescence detection of ultracold atoms. Fluorescence from two spatially separated clouds of ultracold atoms illuminated by a mutual probe laser was imaged onto opposite quadrants of a position-sensitive detector. The populations in the two separated atomic clouds were measured by integrating the quadrant detector photocurrents. Simultaneous detection of the populations of the two atomic clouds was used to reduce noise caused by fluctuations ... |
|
| Reluctant Samurai? Partnering with Japan to Combat Terrorism |
APR 2006 |
43 pages |
| Authors:
Derek A. West; AIR COMMAND AND STAFF COLL MAXWELL AFB AL
|
| The tragedies of 11 September 2001 brought into focus the United States and Japan s shared common values and vulnerability to asymmetric attacks by terrorists. It was as if a flash of lightning from out of the blue illuminated shared fears around the world. Memories of the Aum Shinrikyo (Aum Supreme Truth) sarin-gas attack on the subway system of Tokyo in March 1995 intensified the horror felt by the Japanese ... |
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| Biological Polarized-Light Signaling: Environment, Structure, and Function |
27 FEB 2006 |
14 pages |
| Authors:
Thomas W. Cronin; MARYLAND UNIV BALTIMORE COUNTY CATONSVILLE DEPT OF BIOLOGICAL SCIENCES
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| Here we report our research progress on a grant funded by AFOSR from March 2003-December 2005. Grant-related research was performed in my laboratory at the UMBC Baltimore campus and at a number of laboratory and field sites worldwide. We applied an array of approaches to measure the properties of polarized light and polarized-light fields in natural environments, to quantitate the physics and the structural basis of polarization signals, to understand ... |
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| The Next Marine Corps F/A-18 Targeting Pod: ATFLIR or LITENING? |
07-Feb-2006 |
11 pages |
| Authors:
J M Renaux; MARINE CORPS COMMAND AND STAFF COLL QUANTICO VA
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| The Marine Corps is at a crucial crossroads in its constant effort to remain technologically relevant. Currently, Marine F/A-18 Hornets are not authorized to employ laser-guided bombs (LGBs) when illuminating a target with its NITEHAWK targeting pod, due to the pod's low fidelity and increased chances of target misidentification. As a remedy, the Navy and Marine Corps, as well as F/A-18 air forces around the world, are in the process ... |
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| Australian DefenceScience. Volume 14, Number 2, Summer |
Jan-2006 |
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| Authors:
DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION CANBERRA (AUSTRALIA)
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| CONTENTS: Wet-end diagnostic system for submarine sonar - DSTO has developed a diagnostic system for Collins class submarines to keep tabs on the performance of external parts of sonar systems while submerged. Dealing with invisible forces that mess with aircraft - DSTO has developed a cutting-edge technology to test the ability of Defence aircraft to fly safely through strong electromagnetic fields. World leading research in active sensing radar - DSTO ... |
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| Ultrabright Head Mounted Displays Using LED-Illuminated LCOS |
JAN 2006 |
8 pages |
| Authors:
DISPLAYTECH INC LONGMONT CO
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