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检索条件"任意字段=Conference on Advances in Optical Data Storage Technology"

共 5096 条记录，以下是4281-4290 订阅

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Two color hologram storage using stoichiometric lithium niobate

Two color hologram storage using stoichiometric lithium niob...

引用

1999 Pacific Rim conference on Lasers and Electro-Optics, CLEO/Pacific Rim 1999

作者： Kitamura, K. Furukawa, Y. Lee, M. Hatano, H. Macfarlane, R. Nat. Inst. for Res. in Inorg. Mater. 1 Namiki Tsukuba305-0044 Japan IBM Almaden Research Center 650 Harry Road San JoseCA95120 United States

ISBN: (纸本)0780356616

Digital holographic memory using photorefractive material is one of the most promising candidates for the next-generation of data storage, which simultaneously provides high capacity, fast transfer rate and short access time. This comes from a three-dimensional volume holographic multiplexing scheme based on two dimensional page oriented read-write mechanisms. However there are numerous hurdles on the road to success. The development of a really satisfactory recording material for holographic data storage applications remains perhaps most important barrier to practical implementation of the technology. The ideal material must simultaneously possess many properties such as good sensitivity, large dynamic range, long data retention times and excellent optical quality. In addition, it must be able to be mass produced. From the above points of view, lithium niobate (LiNbO3;abbreviated as LN) is the most promising candidate among all the inorganic photorefractive materials. High quality crystals of up to 3 inches (recently 4 inches) diameter of LN are commercially produced by the Czochralski method as substrate material of SAW devices. Because the growth method has been established, LiNbO3 single crystals doped with hundred wt. ppm of Fe have been investigated as photorefractive data storage material. However, the photorefractive properties are not sufficient for applications and further improvements, especially in writing speed is required as a high priority. © 1999 IEEE.

关键词： Niobium compounds

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Step height metrology for data storage applications

Step height metrology for data storage applications

引用

Proceedings of the 1999 Recent advances in Metrology, Characterization, and Standards for optical Digital data Disks

作者： Koning, Rainer Dixson, Ronald G. Fu, Joe Renegar, Brian T. Vorburger, Theodore V. Tsai, Vincent W. Postek, Michael T. Natl Inst of Standards and Technology Gaithersburg United States

The measurement of bump heights and pit depth on compact discs (CD) with atomic force microscopes (AFMs) is quite different from the measurement of step heights on step height calibration standards. Both the bumps and the pits show much larger transition regimes and more structural irregularities. The irregularities disqualify the effective use of profile based algorithms, which minimize the influence of any remaining motion deviations of the scan apparatus, to determine the height. Therefore a histogram height algorithm has to be used. The results of the bump height and pit depth measurements varied about 20 nm over the different sample regions. The remaining approximately 30 nm difference between the average of the bump height and pit depth is believed to result from the sample preparation procedure. By itself, the large sample variation observed will result in rather large measurement uncertainties for the measurement of the average height and depth of these features, if the averaging does not include a large amount of data taken at many different sample positions.

关键词： CD-ROM

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Improvement to holographic data storage using optimized phase mask

Improvement to holographic data storage using optimized phas...

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1999 Pacific Rim conference on Lasers and Electro-Optics, CLEO/Pacific Rim 1999

作者： Bae, You-Seok Yang, Jianwen Jin, Sang-Ii Lee, Soo-Young Park, Cheol-Hoon Department of Electrical Engineering Korea Advanced Institute of Science and Technology 373-1 Kusong-dong Yusong-gu Taejon305-701 Korea Republic of

ISBN: (纸本)0780356616

Holographic data storage has the advantages of high parallelism, fast access, and large capacity. The storage capacity is represented by the stored pages and pixels in each page. Due to the 3-D nature of the holographic medium, many pages of data may be multiplexed by various methods. For optimal use of the dynamic range of the medium, various phase masks are used to uniform the Fourier spectrum. The design of these masks is based on statistical properties of the input pixels. But, the interpixel cross talk, which is dominated by the pixels within the same page, is difficult to reduce owing to the diffraction of the limited aperture size of the medium. In the paper, we expect the spectrum to be uniform and the reconstruction error to be minimal simultaneously. Therefore, we set the targets of the spectral distribution to be constant rho/f and the reconstructed amplitude rho/2 equal to the input rho/1. The desired rho/f should be chosen so that the energy of the spectral plane would be equal to that of the input plane. We can get the transform matrix between input and Fourier plane and between input and output. © 1999 IEEE.

关键词： Pixels

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advances in biologically inspired on/near sensor processing

Advances in biologically inspired on/near sensor processing

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Infrared technology and Applications XXV conference

作者： McCarley, P USAF Res Lab Munit Directorate Eglin AFB FL 32542 USA

ISBN: (纸本)0819431729

As electro-optic sensors increase in size and frame rate, the data transfer and digital processing resource requirements also increase. In many missions, the spatial area of interest is but a small fraction of the available field of view. Choosing the right region of interest, however, is a challenge and still requires an enormous amount of downstream digital processing resources. In order to filter this ever-increasing amount of data, we look at how nature solves the problem. The Advanced Guidance Division of the Munitions Directorate, Air Force Research Laboratory (AFRL/MNG) at Eglin AFB, Florida, has been pursuing research in the area of advanced sensor and image processing concepts based on biologically inspired sensory information processing. A summary of two "neuromorphic" processing efforts will be presented along with a seeker system concept utilizing this innovative technology. The Neuroseek program is developing a 256 x 256 2-color dual band IRFPA coupled to an optimized silicon CMOS read-out and processing integrated circuit that provides simultaneous full-frame imaging in MWIR/LWIR wavebands along with built-in biologically inspired sensor image processing functions. Concepts and requirements for future such efforts will also be discussed.

关键词： neuromorphic biomimetic smart FPA on-FPA processing

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High-performance 3D-imaging laser sensor 4

High-performance 3D-imaging laser sensor

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conference on Laser Radar technology and Applications IV

作者： Ullrich, A Reichert, R Studnicka, N Riegl, J RIEGL Laser Measurement Systems GmbH (Austria)

ISBN: (纸本)0819431818

A 3D imaging laser sensor is presented providing rapid acquisition of 3D data of naturally reflecting objects. The sensor is of a rugged and compact design, is eye-safe, and can be used even in adverse environmental conditions for a wide range of applications. The sensor makes use of high-speed laser ranging based on the time-of-flight method with pulsed laser diodes and of mechanically scanning the laser beam and the optical axis of the rangefinder's receiver. The maximum achievable range to non-co-operative targets is up to 350 m. The field-of-view of the sensor is settable by software commands and can be up to 80 degrees x 340 degrees with an angular resolution of the scanning mechanism of up to 0.018 degrees. data are provided at a standard parallel interface allowing easy integration with any standard PC based system for data visualization and data processing. The primary data include for each independent range measurement the co-ordinates in the sensor's local polar co-ordinate system, and the intensity of the received laser pulse to provide information on target's reflectivity. These data are provided with an average data rate up to 8000 measurements per second. A PC based acquisition program allows on-line color-encoded visualization, data storage, and data export as ASCII data, VRML data, and other widely used formats. data acquired with the sensor are presented and accuracy and ranging capability are discussed.

关键词： 3D data acquisition 3D range image sensor 3D images virtual reality

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Naval Sensor data database (NSDD)

Naval Sensor Data database (NSDD)

引用

Detection and Remediation Technologies for Mines and Minelike Targets IV conference

作者： Robertson, C Tubridy, L USN Soastal Syst Stn Ctr Surface Warfare Dahlgren Div Panama City FL 32407 USA

ISBN: (纸本)0819431842

The Naval Sensor data database (NSDD) is a multi-year effort to archive, catalogue, and disseminate data from all types of sensors to the mine warfare, signal and image processing, and sensor development communities. The purpose is to improve and accelerate research and technology. Providing performers with the data required to develop and validate improvements in hardware, simulation, and processing will foster advances in sensor and system performance. The NSDD will provide a centralized source of sensor data and its associated ground truth, which will support an improved understanding of the effect of environmental factors on system and subsystem performance. Additionally, research and development will be benefited in the areas of signal processing, computer-aided detection and classification, data compression, data fusion, and gee-referencing, as well as sensor and sensor system design.

关键词： database sonar electro-optic

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Two-photon polymerization Initiators for efficient three-dimensional optical data storage and microfabrication

Two-photon polymerization Initiators for efficient three-dim...

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Quantum Electronics and Laser Science conference, QELS 1999

作者： Kuebler, Stephen M. Ananthavel, Sundaravel Rumi, Mariacristina Marder, Seth R. Perry, Joseph W. Barlow, Stephen Cumpston, Brian H. Dyer, Daniel L. Ehrlich, Jeffrey E. Erskine, Lael L. Heikal, Ahmed A. Lee, I.-Y. Sandy McCord-Maughon, Diane Qin, Jinqui Rockel, Harald Wu, Xiang-Li Department of Chemistry The University of Arizona TucsonAZ85721 United States Beckman Institute Division of Chemistry and Chemical Engineering California Institute of Technology PasadenaCA91125 United States

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CD-R and CD-RW optical disk characterization in response to intense light sources

CD-R and CD-RW optical disk characterization in response to ...

引用

Proceedings of the 1999 Recent advances in Metrology, Characterization, and Standards for optical Digital data Disks

作者： Akhavan, Farhad Milster, Tom D. Univ of Arizona Tucson United States

Several commercial CD-R and CD-RW optical recording disks are exposed to intense white light sources (Halogen Tungsten and High-Intensity Discharge) at different exposure times under three minutes. Main analog playback parameters for CD-R and CD-RW optical recording disks are identified and characterized. The contents of a test disk is recorded onto each CD-R and CD-RW disk using a commercial rewritable/recordable disk drive. For each disk, written marks are imaged under a Nomarsky/Bright field optical microscope before and after exposure. Using a dynamic tester carrier-to-noise ratio and timing jitter are determined before and after exposure. AZO-dye CD-R disks, cyanine-dye CD-R disks, and CD-RW disks show considerable reduction in written mark contrast after exposure. Pthalocyanine-dye CD-R disks do not show significant changes in the mark contrast after exposure. Dynamic tester results confirm the mark contrast results and give insight into playback behavior of exposed disks.

关键词： optical disk storage

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Localized holographic recording in doubly doped lithium niobate

Localized holographic recording in doubly doped lithium niob...

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Proceedings of the 1999 12th Annual Meeting IEEE Lasers and Electro-Optics Society (LEOS'99)

作者： Moser, Christophe Schupp, Benjamin Maravic, Irena Psaltis, Demetri California Inst of Technology Pasadena United States

In holographic data storage, pages of information are overlapped in the volume of the recording medium. Due to destructive read-out in photorefractive crystals such as LiNbO3:Fe, holograms are recorded with an exposure schedule to equalize the diffraction efficiency. Fifty localized holograms in a 4×4×4 mm3 crystal of LiNbO3:Fe,Mn are recorded in a 40 μm·1.5 mm area and analyzed. Selective erasure is achieved with sensitizing light and reference beam illumination. Results show that when localized hologram with equal power is in the reference and signal beam, the equalized diffraction efficiency and recording time for M holograms is roughly equal to that obtained using the conventional distributed volume recording with the same total power.

关键词： optical data storage

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Video data compression using MPEG-2 and frame decimation

Video data compression using MPEG-2 and frame decimation

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Visual Information Processing VIII conference

作者： Leachtenauer, J Richardson, M Garvin, P ERIM Int Arlington VA USA

ISBN: (纸本)0819431907

Video systems have seen a resurgence in military applications since the recent proliferation of unmanned aerial vehicles (UAVs). Video systems offer light weight, low cost, and proven COTS technology. Video has not proven to be a panacea, however, as generally available storage and transmission systems are limited in bandwidth. Digital video systems collect data at rates of up to 270 Mbs;typical transmission bandwidths range from 9600 baud to 10 Mbs. Either extended transmission times or data compression are needed to handle video bit streams. Video compression algorithms have been developed and evaluated in the commercial broadcast and entertainment industry. The Motion Pictures Expert Group (MPEG) developed MPEG-I to compress videos to CD ROM bandwidths (1.5 Mbs) and MPEG-2 to cover the range of 5-10 Mbs and higher. Commercial technology has not extended to lower bandwidths, nor has the impact of MPEG compression for military applications been demonstrated. Using digitized video collected by UAV systems, the effects of data compression on image interpretability and task satisfaction were investigated. Using both MPEG-2 and frame decimation, video clips were compressed to rates of 6Mbs, 1.5 Mbs, and 0.256 Mbs. Experienced image analysts provided task satisfaction estimates and National Image Interpretability Rating Scale (NIIRS) ratings on the compressed and uncompressed video clips. Results were analyzed to define the effects of compression rate and method on interpretability and task satisfaction. Lossless compression was estimated to occur at similar to 10 Mbs and frame decimation was superior to MPEG-2 at low bit rates.

关键词： video compression MPEG-2 NIIRS image quality

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