Filters: Collection: "ir_uspace"
| Creator | Title | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
| 126 |
 |
Gerig, Guido | Estimation of smooth growth trajectories with controlled acceleration from time series shape data | Longitudinal shape analysis often relies on the estimation of a realistic continuous growth scenario from data sparsely distributed in time. In this paper, we propose a new type of growth model para-meterized by acceleration, whereas standard methods typically control the velocity. This mimics the b... | 2011-01-01 | |
| 127 |
 |
Gerig, Guido | Geodesic image regression with a sparse parameterization of diffeomorphisms | Image regression allows for time-discrete imaging data to be modeled continuously, and is a crucial tool for conducting statistical analysis on longitudinal images. Geodesic models are particularly well suited for statistical analysis, as image evolution is fully characterized by a baseline image an... | 2013-01-01 | |
| 128 |
 |
Parker, Steven G.; Hansen, Charles D.; Shirley, Peter S. | Parallel methods for isosurface visualization | isosurface extraction and vis utilization is crucial for explorative scientific visualization of extremely large scientific data. The shear number of polygons extracted and the subsequent rendering time limit interactivity. We explore two solutions to this problem: exploiting parallel graphics hardw... | Isosurfaces; Ray tracing; Large data | 1999 |
| 129 |
 |
Tasdizen, Tolga | Watershed merge forest classification for electron microscopy image stack segmentation | Automated electron microscopy (EM) image analysis techniques can be tremendously helpful for connectomics research. In this paper, we extend our previous work [1] and propose a fully automatic method to utilize inter-section information for intra-section neuron segmentation of EM image stacks. A wat... | 2013-01-01 | |
| 130 |
 |
Silva, Claudio T. | ISP: An optimal out-of-core image-set processing streaming architecture for parallel heterogeneous systems | Image population analysis is the class of statistical methods that plays a central role in understanding the development, evolution, and disease of a population. However, these techniques often require excessive computational power and memory that are compounded with a large number of volumetric inp... | 2012-01-01 | |
| 131 |
 |
Rosen, Paul Andrew | 2D vector field simplification based on robustness | Vector field simplification aims to reduce the complexity of the flow by removing features in order of their relevance and importance, to reveal prominent behavior and obtain a compact representation for interpretation. Most existing simplification techniques based on the topological skeleton succes... | 2014-01-01 | |
| 132 |
 |
Harman, Todd B. | Multiscale modeling of accidental explosions and detonations | Accidental explosions are exceptionally dangerous and costly, both in lives and money. Regarding worldwide conflict with small arms and light weapons, the Small Arms Survey has recorded more than 297 accidental explosions in munitions depots across the world that have resulted in thousands of deaths... | 2013-01-01 | |
| 133 |
 |
Gerig, Guido | Assessment of reliability of multi-site neuroimaging via traveling phantom study | This paper describes a framework for quantitative analysis of neuroimaging data of traveling human phantoms used for cross-site validation. We focus on the analysis of magnetic resonance image data including intra- and intersite comparison. Locations and magnitude of geometric deformation is studied... | 2008-01-01 | |
| 134 |
 |
Gerig, Guido | Constrained data decomposition and regression for analyzing healthy aging from fiber tract diffusion properties | It has been shown that brain structures in normal aging undergo significant changes attributed to neurodevelopmental and neurodegeneration processes as a lifelong, dynamic process. Modeling changes in healthy aging will be necessary to explain differences to neurodegenerative patterns observed in m... | 2009-01-01 | |
| 135 |
 |
Ikits, Milan | Coregistration of pose measurement devices using nonlinear least squares parameter estimation | Multimodal visual haptic user interfaces can be made more effective by accurately colocating the workspaces of their components. We have developed a coregistration technique for pose measurement devices based on nonlinear least squares parameter estimation. A reduced quaternion parameterization is u... | Coregistration; Pose measurement; Haptic interfaces | 2000 |
| 136 |
 |
Riloff, Ellen M. | Learning to identify reduced passive verb phrases with a shallow parser | Our research is motivated by the observation that NLP systems frequently mislabel passive voice verb phrases as being in the active voice when there is no auxiliary verb (e.g., "The man arrested had a long record"). These errors directly impact thematic role recognition and NLP applications that dep... | Passive voice; Reduced passive verb phrases; Shallow parser; Learned classifier | 2008 |
| 137 |
 |
Hansen, Charles D. | Design of 2D time-varying vector fields | Design of time-varying vector fields, i.e., vector fields that can change over time, has a wide variety of important applications in computer graphics. Existing vector field design techniques do not address time-varying vector fields. In this paper, we present a framework for the design of time-vary... | 2012-01-01 | |
| 138 |
 |
Hansen, Charles D. | Illustrative interactive stipple rendering | Abstract-Simulating hand-drawn illustration can succinctly express information in a manner that is communicative and informative. We present a framework for an interactive direct stipple rendering of volume and surface-based objects. By combining the principles of artistic and scientific illustratio... | 2003-04 | |
| 139 |
 |
Hansen, Charles D.; Whitaker, Ross T. | Interactive deformation and visualization of level set surfaces using graphics hardware | Deformable isosurfaces, implemented with level-set methods, have demonstrated a great potential in visualization for applications such as segmentation, surface processing, and surface reconstruction. Their usefulness has been limited, however, by their high computational cost and and reliance on sig... | Deformation; Level sets; Deformable models; Image segmentation; Volume visualization; GPU; Streaming computation; Isosurfaces | 2003 |
| 140 |
 |
Parker, Steven G.; Hansen, Charles D.; Shirley, Peter S. | Interactive ray tracing for volume visualization | We present a brute-force ray tracing system for interactive volume visualization, The system runs on a conventional (distributed) shared-memory multiprocessor machine. For each pixel we trace a ray through a volume to compute the color for that pixel. Although this method has high intrinsic computa... | Ray tracing; Volume visualization; Isosurfaces; Maximum-intensity projection; Traversal optimizations | 1999 |
| 141 |
 |
Tasdizen, Tolga; Whitaker, Ross T. | Automatic assembly of TEM mosaics and mosaic stacks using phase correlation | This paper discusses automatic Transmission Electron Microscopy (TEM) image registration, TEM slice assembly via tile mosaicking, and TEM volume assembly via slice to slice registration. Several algorithms are presented, including an algorithm for mosaic layout of an unordered set of tiles, an algor... | 2007 | |
| 142 |
 |
Gerig, Guido | DTI quality control assessment via error estimation from monte carlo simulations | Diffusion Tensor Imaging (DTI) is currently the state of the art method for characterizing the microscopic tissue structure of white matter in normal or diseased brain in vivo. DTI is estimated from a series of Diffusion Weighted Imaging (DWI) volumes. DWIs suffer from a number of artifacts which ma... | 2013-01-01 | |
| 143 |
 |
Gerig, Guido | Spatio-temporal analysis of early brain development | Analysis of human brain development is a crucial step for improved understanding of neurodevelopmental disorders. We focus on normal brain development as is observed in the multimodal longitudinal MRI/DTI data of neonates to two years of age. We present a spatio-temporal analysis framework using Gom... | 2010-01-01 | |
| 144 |
 |
Stringfellow, Gerald B. | Strain-enhanced doping in semiconductors: effects of dopant size and charge state | When a semiconductor host is doped by a foreign element, it is inevitable that a volume change will occur in the doped system. This volume change depends on both the size and charge state difference between the dopant and the host element. Unlike the ‘‘common expectation'' that if the host is de... | 2010-11 | |
| 145 |
 |
Gerig, Guido | Towards analysis of growth trajectory through multi-modal longitudinal MR imaging | The human brain undergoes significant changes in the first few years after birth, but knowledge about this critical period of development is quite limited. Previous neuroimaging studies have been mostly focused on morphometric measures such as volume and shape, although tissue property measures rela... | 2010-01-01 | |
| 146 |
 |
Hansen, Charles D. | Volume rendering multivariate data to visualize meteorological simulations: a case study | High resolution computational weather models are becoming increasing complex. However, the analysis of these models has not benefited from recent advancements in volume visualization. This case study applies the ideas and techniques from multi-dimensional transfer function based volume rendering to ... | Volume rendering; Direct volume rendering; Isosurfaces; Ray casting; Ray differentials; Transfer function; Preintegration; View dependent | 2002 |
| 147 |
 |
Kirby, Robert Michael | A scalable, efficient scheme for evaluation of stencil computations over unstructured meshes | Stencil computations are a common class of operations that appear in many computational scientific and engineering applications. Stencil computations often benefit from compile-time analysis, exploiting data-locality, and parallelism. Post-processing of discontinuous Galerkin (dG) simulation solutio... | 2013-01-01 | |
| 148 |
 |
Pascucci, Valerio | Exploring power behaviors and trade-offs of in-situ data analytics | As scientific applications target exascale, challenges related to data and energy are becoming dominating concerns. For example, coupled simulation workflows are increasingly adopting in-situ data processing and analysis techniques to address costs and overheads due to data movement and I/O. However... | 2013-01-01 | |
| 149 |
 |
Hansen, Charles D.; Wald, Ingo | Interactive isosurface ray tracing of large octree volumes | We present a technique for ray tracing isosurfaces of large compressed structured volumes. Data is first converted into a losslesscompression octree representation that occupies a fraction of the original memory footprint. An isosurface is then dynamically rendered by tracing rays through a min/max... | 2006-09 | |
| 150 |
 |
Pascucci, Valerio | The parallel computation of morse-smale complexes | Topology-based techniques are useful for multi-scale exploration of the feature space of scalar-valued functions, such as those derived from the output of large-scale simulations. The Morse-Smale (MS) complex, in particular, allows robust identification of gradient-based features, and therefore is s... | 2012-01-01 |