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检索条件"任意字段=Conference on Visual Data Exploration and Analysis IV"

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METHODS FOR USER-BASED REDUCTION OF MODEL COMPLEXITY FOR VIRTUAL PLANETARY exploration 4

METHODS FOR USER-BASED REDUCTION OF MODEL COMPLEXITY FOR VIR...

引用

CONF ON HUMAN VISION, visual PROCESSING, AND DIGITAL DISPLAY 4

作者： HITCHNER, LE MCGREEVY, MW NASA Ames Research Ctr. (United States)

ISBN: (纸本)0819411469

The NASA Ames Virtual Planetary exploration (VPE) Testbed is developing methods for visualizing large planetary terrains in an interactive, immersive virtual environment system using a head-mounted display. Our data is the surface of Mars, modeled with a polygon mesh that typically contains 10⁵ or more polygons. The goal of our work is to present terrain views with both high detail and frame update rates of 10 Hz or greater. We do this with extended level of detail (LOD) management. In VPE we include three LOD criteria: (1) distance from the viewpoint, (2) distance from the center of field of view, and (3) a metric based upon user-defined regions of interest. Motivations for these are: (1) all objects, independent of position, only need be displayed at a minimum visually perceptible resolution, (2) interest is focussed on the center of the field in a head-directed display, and (3) a feature's level of detail should relate to its importance to the application task. Our method uses analysis functions for each criterion that compute normalized scale factors. Factors are combined with user specified weights. At every frame update each region of the scene is analyzed, and its resulting scale factor determines which model to render. Parameters for each criterion may be interactively set by the user or automatically set by system to meet performance criteria (e.g., frame update rate).

关键词： visualization Systems modeling Virtual reality data modeling 3D modeling visual process modeling Computing systems Motion models Performance modeling Head-mounted displays

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MODELING STARING THERMAL-SYSTEMS WITH FLIR92

MODELING STARING THERMAL-SYSTEMS WITH FLIR92

引用

conference on Infrared Imaging System: Design, analysis, Modeling, and Testing iv

作者： SCOTT, L USA NIGHT VIS & ELECTR SENSORS DIRECTORATEFT BELVOIRVA 22060

ISBN: (纸本)0819412058

With the increasing availability and applicability of staring focal plane array (FPA) thermal imagers, the accurate modeling of these sensors is a critical requirement within the infrared community. The FLIR92 sensor performance model, developed by the U.S. Army Night Vision and Electronic Sensors Directorate (NVESD), provides the capability to predict laboratory performance for staring FPA thermal imagers. FLIR92 uses readily available system level parameters to predict the device MRTD and MDTD. This paper illustrates the techniques used in the model by evaluating performance for a staring FPA thermal imager.

关键词： Modulation transfer functions Minimum resolvable temperature difference Systems modeling Thermal modeling Thermography Sensors Staring arrays 3D modeling data modeling visual process modeling

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Rapid exploration of curvilinear grids using direct volume rendering 4

Rapid exploration of curvilinear grids using direct volume r...

引用

4th Annual IEEE conference on visualization, VIS 1993

作者： Van Gelder, Allen Wilhelms, Jane Computer and Information Sciences University of California Santa CruzCA95064 United States

ISBN: (纸本)0818639407

Fast techniques for direct volume rendering over curvilinear grids (common to computational fluid dynamics and finite element analysis) are developed. Three new projection methods that use polygon-rendering hardware for speed are presented and compared with each other and with previous methods for tetrahedral grids and rectilinear grids. A simplified algorithm for visibility ordering, based on a combination of breadth-first and depth-first searches, is described. A new multi-pass blending method is described that reduces visual artifacts that are introduced by linear interpolation in hardware where exponential interpolation is needed. visualization tools that permit rapid data banding and cycling through transfer functions, as well as region restriction, are described. © 1993 IEEE.

关键词： Blending

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Towards a unified visual database access

Towards a unified visual database access

引用

Proceedings of the 1993 ACM SIGMOD International conference on Management of data

作者： Vadaparty, K. Aslandogan, Y.A. Ozsoyoglu, G. Case Western Reserve Univ Cleveland United States

ISBN: (纸本)0897915925

Since the development of QBE, over fifty visual query languages have been proposed to facilitate easy database access. Although these languages have introduced some very useful paradigms, a number of these have some severe limitations, such as: (a) not extending beyond the relational model (b) not considering negation and safety, formally (c) using ad hoc constructs, with no analysis of expressivity or complexity done, etc. Note that visual database access is an important issue being revisited, with the emergence of different flavors of object-oriented databases. We believe that there is a need for developing a unified visual query language. Specifically, our goal is to develop a visual query language that has the following properties: (i) It has a few core constructs using which 'expert-users' can define new (derived) constructs easily (ii) 'Normal users' can use easily either the core or the derived constructs for database querying (iii) It can implement representative constructs of other (textual or visual) query language straightforwardly, and (iv) It has formal semantics, with its theoretical properties, such as complexity, analyzed. We believe that we make a first step towards the above goal by introducing a new logical construct called restricted universal quantifier and combining it with the hierarchical structure of windows to develop a visual Query Language, called VQL. The core constructs of VQL can encode easily a number of representative constructs of different (about six visual and four non-visual) relational, nested and object-oriented query languages. We also study the theoretical aspects such as safety, complexity, etc., of VQL.

关键词： Query languages

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ALIASING AS NOISE - A QUANTITATivE AND QUALITATivE ASSESSMENT 2

ALIASING AS NOISE - A QUANTITATIVE AND QUALITATIVE ASSESSMEN...

引用

conference on Infrared Imaging System: Design, analysis, Modeling, and Testing iv

作者： PARK, SK HAZRA, R COLL WILLIAM & MARY DEPT COMP SCIWILLIAMSBURGVA 23185

ISBN: (纸本)0819412058

Natural scenes are not band-limited and for most contemporary sampled imaging systems, the (pre-sampling) image formation subsystem frequency response extends well beyond the sampling passband. For these two reasons, most sampled imaging systems -- particularly staring-array systems -- produce aliasing. That is, the sampling process causes (high) spatial frequencies beyond the sampling passband to fold into (lower) spatial frequencies within the sampling passband. When the aliased, sampled image data is then reconstructed, usually by image display, potentially significant image degradation can be produced. This is a well- established theoretical result which can be (and has been, by many) verified experimentally. In this paper we argue that, for the purposes of system design and digital image processing, aliasing should be treated as signal-dependent, additive noise. The argument is both theoretical and experimental. That is, we present a model-based justification for this argument. Moreover, by using a computational simulation based on this model, we process (high resolution images of) natural scenes in a way which enables the `aliased component' of the reconstructed image to be isolated unambiguously. We demonstrate that our model-based argument leads naturally to system design metrics which quantify the extent of aliasing. And, by illustrating several `aliased component' images, we provide a qualitative assessment of aliasing as noise.

关键词： Modulation transfer functions Image acquisition Image restoration Imaging systems Image processing Image filtering Spatial frequencies visual information processing Interference (communication) Sensors

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Rapid exploration of curvilinear grids using direct volume rendering 93

Rapid exploration of curvilinear grids using direct volume r...

引用

IEEE conference on visualization

作者： A. Van Gelder J. Wilhelms Computer and Information Sciences University of California Santa Cruz CA USA

ISBN: (纸本)9780818639401

关键词： Hardware Grid computing Interpolation Rendering (computer graphics) Physics computing data visualization Costs Ear Computational fluid dynamics Information analysis

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Towards a unified visual database access 93

Towards a unified visual database access

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Proceedings of the 1993 ACM SIGMOD international conference on Management of data

作者： K. Vadaparty Y. A. Aslandogan G. Ozsoyoglu Department of Computer Engineering and Science Case Western Reserve University Cleveland OH

ISBN: (纸本)9780897915922

Since the development of QBE, over fifty visual query languages have been proposed to facilitate easy database access. Although these languages have introduced some very useful paradigms, a number of these have some severe limitations, such as: (a) not extending beyond the relational model (b) not considering negation and safety, formally (c) using ad hoc constructs, with no analysis of expressivity or complexity done, etc. Note that visual database access is an important issue being revisted, with the emergence of different flavors of object-oriented databases. We believe that there is a need for developing a unified visual query ***, our goal is to develop a visual query language that has the following properties: (i) It has a few core constructs using which “expert-users” can define new (derived) constructs easily (ii) “Normal users” can use easily either the core or the derived constructs for database querying (iii) It can implement representative constructs of other (textual or visual) query language straightforwardly, and (iv) It has formal semantics, with its theoretical properties, such as complexity, *** believe that we make a first step towards the above goal by introducing a new logical construct called restricted universal quantifier and combining it with the hierarchical structure of windows to develop a visual Query Language, called VQL. The core constructs of VQL can encode easily a number of representative constructs of different (about six visual and four non-visual) relational, nested and object-oriented query languages. We also study the theoretical aspects such as safety, complexity, etc., of VQL.

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AIAA Space Programs and Technologies conference, 1992

AIAA Space Programs and Technologies Conference, 1992

引用

AIAA Space Programs and Technologies conference, 1992

The proceedings contain 299 papers. The special focus in this conference is on Space Programs and Technologies. The topics include: Spacelab life sciences 1 results;extended duration orbiter - meeting the challenge David saucier;day-of-launch I-load updates for the space shuttle;national launch system comparative economic analysis;system cost modeling - an integrated approach;cost-optimized launch vehicle design;evolutionary lunar systems for human exploration;impact of restructuring on space station freedom assembly sequence;space station freedom pre-integrated truss configuration;a visual display aid for planning rover traversals;the space test program;science data processing in the mission to planet earth era;defining and satisfying the computing requirements of the EOS scientific computing facilities at NASA/MSFC and the rationale for fundamental research in space biology.

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visualLY-AIDED TACTILE exploration.

VISUALLY-AIDED TACTILE EXPLORATION.

引用

Proceedings - 1987 IEEE International conference on Robotics and Automation.

作者： Stansfield, S.A. Univ of Pennsylvania GRASP Lab Philadelphia PA USA Univ of Pennsylvania GRASP Lab Philadelphia PA USA

ISBN: (纸本)0818607874

A system is presented which utilizes vision and touch for object apprehension. The author defines apprehension as the determination of the properties of an object and the relationships among these properties. This is in contrast to recognition, which goes a step further in the determination process by attaching a label to the object as a whole. Vision is used to obtain initial information about the object, including position, two dimensional segmentation, and three dimensional edge analysis. This data is then used to guide an active tactile system in its exploration of the object. The visual and tactile data are combined into a spatial polyhedral representation designed to allow further exploration of the object, as well as high-level reasoning about the object and its components.

关键词： ROBOTS, INDUSTRIAL

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visually-aided tactile exploration

Visually-aided tactile exploration

引用

IEEE International conference on Robotics and Automation (ICRA)

作者： S. Stansfield GRASP Lab University of Pennsylvania Philadelphia PA

In this paper we present a system which utilizes vision and touch for object apprehension. We define apprehension as the determination of the properties of an object and the relationships among these properties. This is in contrast to recognition, which goes a step further in the determination process by attaching a label to the object as a whole. Vision is used to to obtain initial information about the object, including position, two dimensional segmentation, and three dimensional edge analysis. This data is then used to guide an active tactile system in its exploration of the object. The visual and tactile data are combined into a spatial polyhedral representation designed to allow further exploration of the object, as well as high level reasoning about the object and its components.

关键词： Haptic interfaces Robot sensing systems Machine vision Joining processes Grasping Psychology Control systems Information analysis Manipulators Humans

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