In this paper we present results of work done on large image browsing. advances in compression and transmission have allowed efficient usage of storage and transmission resources;however, much work needs to be done in...
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ISBN:
(纸本)0819429880
In this paper we present results of work done on large image browsing. advances in compression and transmission have allowed efficient usage of storage and transmission resources;however, much work needs to be done in order to integrate such concepts in the processing and handling of data. One such problem is image browsing. Large images, in order of hundreds of Megabytes to Gigabytes, exist that not only strain storage resources of some computers but make transmission almost impossible for dialup networks or even some digital networks. By exploiting the fact that receiving nodes need to only view limited regions of the image, a data organization and handling mechanism is devised to serve the appropriate data in a timely fashion. A wavelet-based approach is pursued with desirable compression and progressive characteristics along with scalar and spatial access to pixel data.
We introduced an inorganic electrochromatic layer for layer selection recordable optical disk (LS-R) by applying voltage. The material showed a large transmittance change in a wide wavelength range. The cross-talk bet...
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Holographic datastorage is a new opticaltechnology which allows an important number of bits to be stored in a recording material. In this work, holographic data pages were stored in a PVA/acrylamide photopolymer lay...
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ISBN:
(纸本)9780819476326
Holographic datastorage is a new opticaltechnology which allows an important number of bits to be stored in a recording material. In this work, holographic data pages were stored in a PVA/acrylamide photopolymer layer using a peristrophic multiplexing method. This material is formed of acrylamide photopolymers, which are considered interesting materials for recording holographic memories. A liquid crystal (LCD) device was used to modify the object beam and store the data pages in the material. This LCD was used to modulate the object beam in order to reduce the zero frequency of the Fourier Transform (FT) of the object. The scheme used to reduce this frequency was hybrid ternary modulation (HTM).
An opticalstorage system which stores data in three spacial and three physical dimensions is designed and investigated. Its feasibility has been demonstrated by theoretical derivation and numerical calculation. This ...
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ISBN:
(纸本)9781628412284
An opticalstorage system which stores data in three spacial and three physical dimensions is designed and investigated. Its feasibility has been demonstrated by theoretical derivation and numerical calculation. This system has comprehensive advantages including very large capacity, ultrafast throughputs, relatively simple structure and compatibility with CD and DVD. It's an actually practicable technology. With two-photon absorption writing/erasing and optical coherence tomography reading, its storage capacity is over 32 Tbytes per DVD sized disk, and its reading speed is over 25 Gbits/s with high signal-to-noise ratio of over 76 dB. The larger capacity of over 1 Pbyte per disk is potential.
In volume holographic datastorage systems, there are brightness variations across the detected image. An incorrect choice of the threshold can cause significant degradation in the BER. Therefore various modulation co...
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ISBN:
(纸本)0819447196
In volume holographic datastorage systems, there are brightness variations across the detected image. An incorrect choice of the threshold can cause significant degradation in the BER. Therefore various modulation codes, including global threshold, local threshold, and equal-weight modulation codes, are proposed for volume holographic datastorage systems to improve performance by providing their advantages at the decision stage. Considering about our target and the properties of our holographic datastorage system, we select a modulation code for our system and realize it.
This paper focuses on the different user community EPON(Ethernet Passive optical Network) access scheme design, first introduced the PON access. PON access technology according to the different data link layer technol...
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ISBN:
(纸本)9783642293894
This paper focuses on the different user community EPON(Ethernet Passive optical Network) access scheme design, first introduced the PON access. PON access technology according to the different data link layer technology mainly divided into APON(ATM+PON), EPON (Ethernet+PON) and GPON (ATM/GEM+PON), EPON can carry data services, voice services, IPTV, CATV as a professional, so we adopt EPON technology as the area of the access technology. According to the area of different user's demand for bandwidth and different access methods, selection of optical network terminal, beam splitter and optical network unit equipment, the final design of the area network access scheme, and in the area of optical power loss making a budget. Finally the scheme used by the equipment and its configuration command is introduced in detail in this paper.
The paper presents that modular separation of open systems components is vital to the success of disc based video server solutions. For application of spot playback, systems such as Dynatech's digistore are poised...
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The paper presents that modular separation of open systems components is vital to the success of disc based video server solutions. For application of spot playback, systems such as Dynatech's digistore are poised to exploit the cast rate of technology change in computer peripherals, including storage media. Manufacturers and users can leverage these advances without obsolescence of the systems as a whole, potentionally extending functionality to new applications such as a program.
The materials, method and for storing and accessing information in 3D by means of two-photon absorption will be described. The materials used have very high two photon absorption crosssection and near unit quantum eff...
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The materials, method and for storing and accessing information in 3D by means of two-photon absorption will be described. The materials used have very high two photon absorption crosssection and near unit quantum efficiency for fluorescence. The storage devices are composed of organic molecules, uniformly dispersed in polymer matrices. The binary codes zero and one correspond to two different structures of the same molecule, induced by simultaneous absorption of two photons. The writing and accessing of the information can be performed either bit by bit or in a 2D multibit plane format. Fatigue studies suggest that these materials are suitable for 3D storage devices. Automated recording and readout 3D systems have been constructed and characterized. Channel error sources have been identified, and a custom spatial bit-error-rate test has been developed.
Technical developments in the past few decades have led to scanners with greater accuracy and higher frequencies of operation at larger scan angles with wider apertures. The causes of this evolution of galvanometric a...
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ISBN:
(纸本)0819417300
Technical developments in the past few decades have led to scanners with greater accuracy and higher frequencies of operation at larger scan angles with wider apertures. The causes of this evolution of galvanometric and resonant scanners, whose attributes make sophisticated applications possible, are given in order to anticipate future requirements and technologies for the next generation of these scanning devices.
It is pointed out that, in the 1980s, many companies erroneously believed that it was possible to modify a commercial optical drive and media design for use in the military environment. Over the past 5 years, Honeywel...
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ISBN:
(纸本)078030084X
It is pointed out that, in the 1980s, many companies erroneously believed that it was possible to modify a commercial optical drive and media design for use in the military environment. Over the past 5 years, Honeywell has successfully developed a militarized 300-Mbyte write-once read-many (WORM) optical drive, took it into full production, and is now applying this flight-proven knowledge to rewritable magnetooptic (MO) technology. The authors describe the lessons learned and how those lessons apply to current and future military optical drive developments.
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