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检索条件"任意字段=Conference on Advanced Sensor Systems and Applications X"

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Automatic real-time tilt correction of DMD-based displays for augmented reality applications 10

Automatic real-time tilt correction of DMD-based displays fo...

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conference on Emerging Digital Micromirror Device Based systems and applications x

作者： Castells-Rufas, David Bravo-Montero, Francesc Quezada-Benalcazar, Byron Codina, Marc Carrabina, Jordi Univ Autonoma Barcelona Dept Microelect & Elect Syst Bellaterra 08193 Spain

ISBN: (数字)9781510615786

ISBN: (纸本)9781510615786

Augmented Reality (AR) and Mixed Reality (MR) applications require the combination of synthetic images with the real world. In some cases the real world images are acquired by an image sensor that is then combined with synthetic images and presented to the user to enhance the immersive experience. In the current state of the art, the displays are often mobile phone screens or some smart glasses. As an alternative, we propose to augment the world by projecting synthetic images on real surfaces. To do so effectively, virtual scenes must be properly rendered to match the tilt and position information of the projector which can be acquired from a multitude of sensors. One benefit of this type of AR it that the experience is not only lived by the person holding the projector, but for the people at the surroundings as well. So, a group of people can be aware of the augmentation, leading to a full range of new applications.

关键词： DLP DMD FPGA Augmented Reality IMU Computer Vision Real-Time

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Scanning telescope for the advanced polarized infrared imaging sensor (APIRIS)

Scanning telescope for the advanced polarized infrared imagi...

引用

Thermosense xVII: An International conference on Thermal Sensing and Imaging Diagnostic applications

作者： Feng, Chen Ahmad, Anees Li, Ye Sarepaka, RamaGopal V. Cent. for Applied Optics/Univ. of Alabama in Huntsville Huntsville AL USA

ISBN: (纸本)0819418269

An advanced polarized infra-red imaging sensor (APIRIS) has been designed and prototyped to acquire the polarization signature of targets in the far IR (8 - 12 microns) region with a field of view 4° × 3°. The design (optical and optomechanical), fabrication and assembly issues of the scanning telescope for the APIRIS are discussed in this paper. The telescope is designed for diffraction limited performance using germanium lenses and Zerodur fold mirrors to minimize overall size of the telescope. The tolerance budgeting and thermal sensitivity analysis are also presented.

关键词： Infrared imaging

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Progressive multilayer reconfiguration for software DSM systems in non-dedicated clusters

Progressive multilayer reconfiguration for software DSM syst...

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19th International conference on advanced Information Networking and applications, AINA 2005

作者： Chang, Jyh-Biau Liang, Tyng-Yeu Shieh, Ce-Kuen Department of Electrical Engineering National Cheng Kung University No. 1 Ta-Hsueh Road Tainan 701 Taiwan Department of Electrical Engineering National Kaohsiung University of Applied Science No. 415 Chien Kung Road Kaohsiung 807 Taiwan

ISBN: (纸本)0769522491

This paper is aimed at resolving the reconfiguration problem of software distributed shared memory (DSM) systems in non-dedicated clusters. Different to the past studies focused on dedicated clusters, the goal of this study focuses on prompting system-wide jobs' throughput rather than DSM programs' performance. We invent a novel approach called Progressive Multilayer Reconfiguration (PMR) for DSM systems. As named, reconfiguration is divided into three different layers, i.e., processor, application, and node in this approach. According to the state transfer of the workload, the three different layer reconfigurations are progressively and respectively performed during the execution of DSM applications. The preliminary results show that PMR can not only utilize abundant CPU cycles available in non-dedicated clusters for DSM applications but also minimize the slowdown of local jobs caused by the disturb from DSM applications. © 2005 IEEE.

关键词： Distributed computer systems

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Environmental Exposure Tracking sensor

Environmental Exposure Tracking Sensor

引用

conference on Industrial and Commercial applications of Smart Structures Technologies

作者： Havens, Teresa Everhart, Joel McFerran, Jace Cornerstone Res Grp 2750 Indian Ripple Rd Dayton OH 45440 USA Naval Surface Warfare Ctr Dahlgren VA 22448 USA

ISBN: (纸本)9780819475503

Cornerstone Research Group Inc. (CRG) has developed environmental exposure tracking (EET) sensors using shape memory polymer (SMP) to monitor the degradation of perishable items, such as munitions, medicines or foods, by measuring the cumulative exposure to temperature and moisture. SMPs are polymers whose qualities have been altered to give them dynamic shape "memory" properties. Under thermal or moisture stimuli, SMP exhibits a radical change from a rigid thermoset to a highly flexible, elastic state. The dynamic response of the SMP can be tailored to match the degradation profile of the perishable item. SMP-based EET sensors require no digital memory or internal power supply and provide the capability of inexpensive, long-term life cycle monitoring thermal and moisture exposure over time. In a Phase I and II SBIR effort with the Navy, CRG demonstrated the feasibility of SMP-based EET sensor with two material systems. These material systems required different activation stimuli, heat or water vapor pressure. CRG developed the ability to tailor these materials to customize the dynamic response to match various degradation profiles of munitions. CRG optimized and characterized the SMP formulations and sensor design configuration to develop a suite of data from which any degradation profile can be met. CRG's EET sensors are capable of monitoring temperatures from -30 degrees C to 260 degrees C. The prototypes monitor cumulative thermal exposure and provide real-time information in a visually readable or a remotely interrogated version. CRG is currently scaling up the manufacture of the sensors for munitions reliability applications with the Navy.

关键词： thermal sensor humidity sensor product freshness RFID

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Photon-noise-limited performance for a hybrid wavefront sensor operating in strong turbulence

Photon-noise-limited performance for a hybrid wavefront sens...

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SPIE Optical Engineering + applications

作者： Ellis, Troy R. Schmidt, Jason D. Air Force Institute of Technology 2950 Hobson Way Wright-Patterson AFB OH 45433-7765 United States

ISBN: (纸本)9780819477569

Adaptive optics (AO) systems on airborne platforms must be able to sense fields degraded by strong turbulence often over long horizontal propagation paths. This paper presents results of simulated hybrid-wavefront-sensor performance when measuring optical fields due to propagation of a distant point source through Kolmogorov turbulence. The hybrid-wavefront-sensor simulation combines Shack-Hartmann and self-referencing-interferometer (SRI) measurements degraded by photon noise and produces higher-resolution wavefront estimates that are less susceptible to noise than either sensor acting alone and that inherit the SRI's insensitivity to scintillation. © 2009 SPIE.

关键词： Atmospheric turbulence

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Tradeoffs in imager design parameters for sensor reliability

Tradeoffs in imager design parameters for sensor reliability

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conference on sensors, Cameras, and systems for Industrial, Scientific, and Consumer applications xII

作者： Chapman, Glenn H. Leung, Jenny Thomas, Rahul Koren, Zahava Koren, Israel Simon Fraser Univ Sch Engn Sci 8888 Univ Dr Burnaby BC V5A 1S6 Canada Univ Massachusetts Dept Elect & Comp Engn Amherst MA 01003 USA

ISBN: (纸本)9780819484123

Image sensors are continuously subject to the development of in-field permanent defects in the form of hot pixels. Based on measurements of defect rates in 23 DSLRs, 4 point and shoot cameras, and 11 cell phone cameras, we show in this paper that the rate of these defects depends on the technology (APS or CCD) and on design parameters the like of imager area, pixel size, and gain (ISO). Increasing the image sensitivity (ISO) (from 400 up to 25,600 ISO range) causes the defects to be more noticeable, with some going into saturation, and at the same time increases the defect rate. Partially stuck hot pixels, which have an offset independent of exposure time, make up more than 40% of the defects and are particularly affected by ISO changes. Comparing different sensor sizes has shown that if the pixel size is nearly constant, the defect rate scales with sensor area. Plotting imager defect/year/sq mm with different pixel sizes (from 7.5 to 1.5 microns) and fitting the result shows that defect rates grow rapidly as pixel size shrinks, with an empirical power law of the pixel size to the -2.5. These defect rate trends result in interesting tradeoffs in imager design.

关键词： defect detection hot pixel imager defects active pixel sensor APS CMOS image sensor demosaicing

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The Utility of Polarimetry within Passive Military Imaging systems 14

The Utility of Polarimetry within Passive Military Imaging S...

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conference on Electro-Optical and Infrared systems - Technology and applications xIV

作者： Hickman, Duncan L. Smith, Moira I. Kim, Kyung Su Choi, Hyun-Jin Tektonex Ltd Argyll Rd Kilcreggan Scotland Agcy Def Dev Sunamdong Daejeon South Korea

ISBN: (数字)9781510613317

ISBN: (纸本)9781510613317;9781510613300

An ongoing challenge for many military imaging systems is the detection and classification of weak target signatures in a cluttered environment. In such cases, the use of image contrast and relative target motion alone does not always provide a sufficient level of target discrimination to give operational confidence and it is therefore necessary to consider the use of other discriminatory scene information. Polarisation is one such source of information and this paper reports on an extensive series of polarimetric trials undertaken across the visible, NIR, SWIR, MWIR and LWIR spectral bands. Using this data, the benefits and limitations of polarisation discrimination are reviewed in the context of practical military scenarios. It is shown that polarisation signatures vary with viewing geometry and atmospheric conditions. This would lead to an unpredictable performance level if the sensor discrimination was based solely on polarisation. However, by carefully combining polarisation with other scene information, useful operational benefits can be obtained and this is illustrated through a consideration of different data fusion approaches.

关键词： Polarisation Polarimetry Spectral Processing Automatic Target Detection and Recognition (ATD/R) Clutter Suppression EO sensor Performance Robustness Image and Data Fusion

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High resolution measurement of freeform wavefront by using self-imaging based sensor 11

High resolution measurement of freeform wavefront by using s...

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conference on Optical Measurement systems for Industrial Inspection xI held at SPIE Optical Metrology Symposium

作者： MohanPant, Lalit Pant, K. K. Burada, Dali R. Ghosh, A. Khan, Gufran S. Shakher, Chandra Indian Inst Technol Delhi Instrument Design Dev Ctr New Delhi 110016 India Instruments Res & Dev Estab Dehra Dun 248008 Uttar Pradesh India

ISBN: (数字)9781510627925

ISBN: (纸本)9781510627925

The freeform optical surfaces are the advanced optical elements being used in the optical systems ranging from the illumination system, head up display and ophthalmic systems. So far the metrology is not well established for freeform *** are interferometric, profilometry, deflectometry and slope measurement techniques used to measure the freeform surfaces. Due to non-rotationally symmetric nature of freeform surfaces, slope measurement systems like Shack Hartman sensors (SHS) are being explored for the measurement of freeform wavefronts. The spatial resolution of Shack Hartmann sensor is limited by the size of the lens lets used in the sensor which is typically 100 mu m to 200 mu m. The self-imaging based sensing uses a periodic structure which can be replicated under collimated illumination at certain distance known as Talbot distance. If there is a wavefront other than collimated light, the deviation in self-imaging pattern is observed, and this deviation can be utilised for wavefront measurements. Being a smaller pitch of the periodic structure, a high resolution data is obtained. In the present study, we have proposed a high resolution system for measurement of freeform surface using self-imaging based technique, which is having advantage of higher spatial data as compared to Shack Hartman sensor. A simulation study is carried out and demonstrated the improved performance of the proposed sensor as compared to SHS.

关键词： Freeform surface Talbot effect Zernike coefficients self-imaging

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sensor suite for the advanced Electro-Optical System (AEOS) 3.6-meter telescope 2

Sensor suite for the Advanced Electro-Optical System (AEOS) ...

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conference on Imaging Spectrometry II

作者： Vigil, ML Witte, DJ LeVan, PD Wallentine, PJ Briscoe, DE Anderson, DL Air Force Phillips Laboratory Lasers & Imaging and Space & Missile Dirct. 3550 Aberdeen Ave. SE Kirtland AFB 87117-5776 NM United States Logicon RDA P.O. Box 9377 Albuquerque 87119-9377 NM United States S. Systems Corporation 2501 Yale Blvd. SE Albuquerque 87106 NM United States

ISBN: (纸本)081942207X

The Phillips Laboratory advanced Electro-Optical System (AEOS) comprises an observatory facility, a united computer network, a 3.63 meter telescope, and an associated sensor suite that will become operational beginning in 1997. Space Object Identification (SOI) is the primary mission for AEOS;however, astronomical applications and other visiting experiments are readily supported by the system design. The AEOS sensor suite functions derive from Air Force Space Command requirements, and incorporate high resolution imagery and multi-band radiometry performed over a broad range of wavelengths. Data collection capabilities are optimized for the rapid temporal variations in observed target brightness that arise from both intrinsic target variability and changing atmospheric characteristics during the course of an observation. Multi-spectral photometry/radiometry over the 0.4-23 mu m spectral region constitutes the principal observational technique for spatially unresolved targets. Thermal infrared wavelengths, i.e., 4-23 mu m, permit observation of targets that are in the shadow of the earth, and provide temperature measurements on all targets. High resolution visible to near-infrared imagery (0.7-1.0 mu m), approaching the diffraction limit, is collected on sunlit targets via an adaptive optics (A/O) system. Simultaneous LWIR(8-13 mu m) imagery is obtained with an infrared sensor that shares the high-resolution NIR imager's field of view through a dichroic beamsplitter. In order to minimize the thermal background, the LWIR imager is located close to the telescope, upstream of the A/O system. The LWIR resolution approaches the diffraction limit, due to the decreased impact of atmospheric turbulence at those wavelengths.

关键词： electro-optical sensors visible infrared LWIR adaptive optics radiometer radiometry imagery telescope observatory

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MAGNET-SENSITIVE OPTICAL FIBER AND ITS APPLICATION IN CURRENT sensor SYSTEM

MAGNET-SENSITIVE OPTICAL FIBER AND ITS APPLICATION IN CURREN...

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INTERNATIONAL CONF ON OPTICAL FIBRE sensorS IN CHINA ( OFS-C 91 )

作者： YU, T LI, Q CHEN, RS YAN, JL Beijing Glass Research Institute (China)

ISBN: (纸本)081940702X

Terbium-doped optical fiber has a high Verdet constant and is called a magnet-sensitive fiber. It is of importance for a variety of applications, including magnetic field sensors, current sensors, and fiber-type isolators. In this paper, the authors describe magnet-sensitive optical fiber fabrication, magneto-optic coefficient measurement, and its application in current sensor systems. Experimental results show that the Verdet constant of magnet-sensitive fiber containing high rare-earth content (approximately 4000 parts in 106) is 2.7 times as high as that of ordinary silica-based fiber. When tested in current sensor systems, it gives similar performance observed in ultralow birefringent fiber.

关键词： Optical fibers sensors Magnetic sensors Ions Birefringence Fiber optics sensors Glasses Optical fabrication Optical isolators Silica

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