Contemporary microprocessors provide a rich set of integrated performance counters that allow application developers and system architects alike the opportunity to gather important information about workload behaviors...
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We implemented a hybrid immersive visualization system for a five dimensional (5D) coupled bottom boundary layer-sedimentation model. This model predicts sediment resuspension, transport, and resulting distributions f...
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ISBN:
(纸本)0819444057
We implemented a hybrid immersive visualization system for a five dimensional (5D) coupled bottom boundary layer-sedimentation model. This model predicts sediment resuspension, transport, and resulting distributions for shallow water regions on continental shelves. One variable of interest, suspended sediment concentration (SSC), is 51) and varies by longitude, latitude, depth, time, and grain size. At each grid point there are twenty values for SSC, representing grain sizes ranging from 2.36 to 3306 mum. Currently the most common methods of analyzing the SSC distribution are only 2D, e.g., point profiles, cross-sections, map views at equal water depths, and time series. Traditional methods require multiple sets of plots that are analyzed manually. Good 3D methods are needed that will allow researchers to investigate the complex relationships between variables and see the underlying physical processes more comprehensively, especially within the wave boundary layer close to the ocean bottom. This paper presents the work in progress on the motivation, requirements, and overall design of the visualization system, along with the latest efforts to incorporate volume visualization as an effective means of understanding the SSC variable. The system is optimized for deployment in a CAVE. We also describe the extension of this system to other problem domains.
Electronic Warfare Systems tests, whether performed in the lab or on the range, require extensive configuration of the test equipment, all attributes of which must be stored for later data reduction and analysis. Many...
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ISBN:
(纸本)0819444944
Electronic Warfare Systems tests, whether performed in the lab or on the range, require extensive configuration of the test equipment, all attributes of which must be stored for later data reduction and analysis. Many tests require similar configurations;it would therefore be useful if general-purpose configuration templates could be built once then reused whenever necessary. In this paper, a data model is developed which stores complex EW-system test configurations. Configurations may be reused at multiple levels. Should new kinds of data be required in the future, the model is extensible. Equally important, the model can be pared down in uncomplicated configuration situations. Finally, less frustration during data reduction and analysis would occur since the model facilitates straightforward data entry. Software that reduces data gleaned from EW-system tests may use this model both to develop databases for configuration storage and as part of the internal model of the reduction software itself.
This paper describes a new method to segment vascular structures in 3D MRA data, based on the Wavefront Propagation algorithm. The center lumen line and the vessel boundary are detected automatically. Our 3D visualiza...
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ISBN:
(纸本)3540435948
This paper describes a new method to segment vascular structures in 3D MRA data, based on the Wavefront Propagation algorithm. The center lumen line and the vessel boundary are detected automatically. Our 3D visualization and interaction platform will be prestended, which is used to aid the phycisian in the analysis of the MRA data. The results are compared to conventional X-ray DSA which is considered the current gold-standard. Provided that the diameter of the vessel is larger than 3 voxels, our method has similar result as X-ray DSA.
This work discusses various techniques used in visualizing sets of coregistered images for planetary lander or rover mission operations. Imagery from all available instrumentation on board a planetary rover or lander ...
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The interpretation of radiological image is routine but it remains a rather difficult task for physicians. It requires complex mental processes, that permit translation from 2D slices into 3D localization and volume d...
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ISBN:
(纸本)081944426X
The interpretation of radiological image is routine but it remains a rather difficult task for physicians. It requires complex mental processes, that permit translation from 2D slices into 3D localization and volume determination of visible diseases. An easier and more extensive visualization and exploitation of medical images can be reached through the use of computer-based systems that provide real help from patient admission to post-operative follow-up. In this way, we have developed a 3D visualization interface linked to a PACS database that allows manipulation and interaction on virtual organs delineated from CT-scan or MRI. This software provides the 3D real-time surface rendering of anatomical structures, an accurate evaluation of volumes and distances and the improvement of radiological image analysis and exam annotation through a negatoscope tool. It also provides a tool for surgical planning allowing the positioning of an interactive laparoscopic instrument and the organ resection. The software system could revolutionize the field of computerized imaging technology. Indeed, it provides a handy and portable tool for pre-operative and intra-operative analysis of anatomy and pathology in various medical fields. This constitutes the first step of the future development of augmented reality and surgical simulation systems.
Many atmospheric and oceanographic data sets are being archived in Hierarchical data Format (HDF). HDF is self-documenting and enables the storage of large scientific data sets in a common, efficient machine-independe...
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Many atmospheric and oceanographic data sets are being archived in Hierarchical data Format (HDF). HDF is self-documenting and enables the storage of large scientific data sets in a common, efficient machine-independent binary format. Science Applications International Corporation (SAIC) along with the Atmospheric Sciences Competency at NASA Langley Research Center (LaRC), have developed an interactive visualization and analysis tool, view_HDF, to manipulate HDF files. view_HDF was initially developed for the Clouds and the Earth's Radiant Energy System (CERES) project at NASA/LaRC, then later extended to HDF files in general. This tool is designed to work with any HDF file and provides a broad range of visualization and analysis capabilities that allow researchers to select, analyze, and manipulate information stored in HDF files. view_HDF can also read column formatted ASCII text. Examples of the tool's versatility and utility are presented using atmospheric and oceanographic data sets. The included data products come from the CERES, TOPEX/Poseidon, MODIS, and Pathfinder missions. From these data products, view_HDF is demonstrated to extract and geolocate, Sea Surface Height, Sea Surface Temperature, Scene Identification, and Wind Speed over ocean for a common data day. The software is written in Interactive data Language (IDL), and although originally developed on a UNIX platform, it has been ported to Microsoft Windows environment. It should be portable to any platform that supports IDL. view_HDF is available from the NASA/LaRC Atmospheric Sciences data Center at http://***/HPDOCS/view_***. The software packages also contain a User's Guide in PDF and a sample data file.
A novel paradigm for information visualization in high dynamic range images is presented in this paper. These images, real or synthetic, have luminance with typical ranges many orders of magnitude higher than that of ...
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A novel paradigm for information visualization in high dynamic range images is presented in this paper. These images, real or synthetic, have luminance with typical ranges many orders of magnitude higher than that of standard output devices, thereby requiring some processing for their visualization. In contrast with existent approaches, which compute a single image with reduced range, close in a given sense to the original data, we propose to look for a representative set of images. The goal is then to produce a minimal set of images capturing the information all over the high dynamic range data, while at the same time preserving a natural appearance for each one of the images in the set. A specific algorithm that achieves this goal is presented and tested on natural and synthetic data.
The permanent or regular monitoring of structures with sensors of any type can generate a consistent volume of data. Furthermore, it is often necessary to store additional information that is useful for the analysis o...
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ISBN:
(纸本)0819444448
The permanent or regular monitoring of structures with sensors of any type can generate a consistent volume of data. Furthermore, it is often necessary to store additional information that is useful for the analysis of the measurements. This data should be comprehensible even after tens of years. Our experience has shown that the use of relational database structures can greatly simplify the handling of this large data-flow. With an appropriate data structure, the measurement data and other related information on the monitoring network, the structure and its environment can be organized in a single file that will follow the structure's life in the years. The standardization of a database structure for storing monitoring data also allows the development of re-usable components for data acquisition, dataanalysis and representation. The use of relational database structures greatly simplifies the quality management and can help in the certification of monitoring systems. This contribution presents a new open and free standard for database structures aiming to the archival of long-term monitoring data (SDB standard). The implementation of this standard in data acquisition, analysis and representation software modules will also be described.
Exploring large data sets typically involves activities that iterate between data selection and dataanalysis, in which insights obtained from analysis result in new data selection. Further, dataanalysis needs to use...
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