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Development and implementation of rear projection algorithm based on high-end graphics accelerator

Development and implementation of rear projection algorithm ...

引用

16th International Conference on computer graphics and Vision, GraphiCon 2006

作者： Kovalkov, Max Rukhlinsky, Alexey V. Tarancev, Igor G. Department of Physics Novosibirsk State University Russia Laboratory of Synthesizing Visualization Systems IAE Russia Laboratory Computer Graphics IAE Russia

The algorithm of rear projection of noisy image is considered. Different types of filtration for suppression of noise are observed. Quantitative assessment of speed of the software implementation of the proposed algor... 详细信息

关键词： Image filtration Rear projection

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A survey of dimension reduction methods for high-dimensional data analysis and visualization

A survey of dimension reduction methods for high-dimensional...

引用

International Research and Training Group 1131 Workshop on visualization of Large and Unstructured Data Sets: Applications in Geospatial Planning, Modeling and Engineering, VLUDS 2011

作者： Engel, Daniel Hüttenberger, Lars Hamann, Bernd Computer Graphics and HCI Group University of Kaiserslautern Germany CS Department Institute for Data Analysis and Visualization University of California Davis United States

ISBN: (纸本)9783939897460

Dimension reduction is commonly defined as the process of mapping high-dimensional data to a lower-dimensional embedding. Applications of dimension reduction include, but are not limited to, filtering, compression, regression, classification, feature analysis, and visualization. We review methods that compute a point-based visual representation of high-dimensional data sets to aid in exploratory data analysis. The aim is not to be exhaustive but to provide an overview of basic approaches, as well as to review select state-of-the-art methods. Our survey paper is an introduction to dimension reduction from a visualization point of view. Subsequently, a comparison of state-of-the-art methods outlines relations and shared research foci.

关键词： visualization

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Revealing the Invisible: Visual Analytics and Explanatory Storytelling for Advanced Team Sport Analysis

Revealing the Invisible: Visual Analytics and Explanatory St...

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2018 International Symposium on Big Data Visual and Immersive Analytics, BDVA 2018

作者： Stein, Manuel Breitkreutz, Thorsten Haussler, Johannes Seebacher, Daniel Niederberger, Christoph Schreck, Tobias Grossniklaus, Michael Keim, Daniel Janetzko, Halldor Department of Computer and Information Science University of Konstanz Germany VIZRT Switzerland Institute for Computer Graphics and Knowledge Visualization Graz University of Technology Austria Department of Geography University of Zurich Switzerland

ISBN: (纸本)9781538691946

The analysis of invasive team sports often concentrates on cooperative and competitive aspects of collective movement behavior. A main goal is the identification and explanation of strategies, and eventually the development of new strategies. In visual sports analytics, a range of different visual-interactive analysis techniques have been proposed, e.g., based on visualization using for example trajectories, graphs, heatmaps, and animations. Identifying suitable visualizations for a specific situation is key to a successful analysis. Existing systems enable the interactive selection of different visualization facets to support the analysis process. However, an interactive selection of appropriate visualizations is a difficult, complex, and time-consuming task. In this paper, we propose a four-step analytics conceptual workflow for an automatic selection of appropriate views for key situations in soccer games. Our concept covers classification, specification, explanation, and alteration of match situations, effectively enabling the analysts to focus on important game situations and the determination of alternative moves. Combining abstract visualizations with real world video recordings by Immersive Visual Analytics and descriptive storylines, we support domain experts in understanding key situations. We demonstrate the usefulness of our proposed conceptual workflow via two proofs of concept and evaluate our system by comparing our results to manual video annotations by domain experts. Initial expert feedback shows that our proposed concept improves the understanding of competitive sports and leads to a more efficient data analysis. © 2018 IEEE.

关键词： visualization

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GPU-ASIFT: A fast fully affine-invariant feature extraction algorithm

GPU-ASIFT: A fast fully affine-invariant feature extraction ...

引用

2013 11th International Conference on High Performance Computing and Simulation, HPCS 2013

作者： Codreanu, Valeriu Dong, Feng Liu, Baoquan Roerdink, Jos B.T.M. Williams, David Yang, Po Yasar, Burhan Scientific Visualization and Computer Graphics Rijksuniversiteit Groningen Groningen Netherlands Department of Computer Science and Technology University of Bedfordshire Bedfordshire United Kingdom Rotasoft Inc United Kingdom

ISBN: (纸本)9781479908363

This paper presents a method that takes advantage of powerful graphics hardware to obtain fully affine-invariant image feature detection and matching. The chosen approach is the accurate, but also very computationally expensive, ASIFT algorithm. We have created a CUDA version of this algorithm that is up to 70 times faster than the original implementation, while keeping the algorithm's accuracy close to that of ASIFT. It's matching performance is therefore much better than that of other non-fully affine-invariant algorithms. Also, this approach was adapted to fit the multi-GPU paradigm in order to assess the acceleration potential from modern GPU clusters. © 2013 IEEE.

关键词： computer vision

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RegistrationShop: An interactive 3d medical volume registration system

RegistrationShop: An interactive 3d medical volume registrat...

引用

2014 Eurographics Workshop on Visual Computing for Biology and Medicine, VCBM 2014

作者： Smit, Noeska N. Haneveld, Berend Klein Staring, Marius Eisemann, Elmar Botha, Charl P. Vilanova, Anna Computer Graphics and Visualization group Intelligent Systems TU Delft Netherlands Division of Image Processing Department of Radiology LUMC Netherlands Vxlabs South Africa

ISBN: (纸本)9783905674620

In medical imaging, registration is used to combine images containing information from different modalities or to track treatment effects over time in individual patients. Most registration software packages do not provide an easy-to-use interface that facilitates the use of registration. 2D visualization techniques are often used for visualizing 3D datasets. RegistrationShop was developed to improve and ease the process of volume registration using 3D visualizations and intuitive interactive tools. It supports several basic visualizations of 3D volumetric data. Interactive rigid and non-rigid transformation tools can be used to manipulate the volumes and immediate visual feedback for all rigid transformation tools allows the user to examine the current result in real-time. In this context, we introduce 3D comparative visualization techniques, as well as a way of placing landmarks in 3D volumes. Finally, we evaluated our approach with domain experts, who underlined the potential and usefulness of RegistrationShop. © Eurographics Workshop on Visual Computing for Biology and Medicine, VCBM 2014. All rights reserved.

关键词： Medical imaging

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A Study of Transfer Function Generation for Time-Varying Volume Data 2

A Study of Transfer Function Generation for Time-Varying Vol...

引用

2nd IEEE TCVG / Eurographics International Workshop on Volume graphics, VG 2001

作者： Jankun-Kelly, T.J. Ma, Kwan-Liu Visualization And Graphics Research Group Center For Image Processing And Integrated Computing University Of California Department Of Computer Science DavisCA95616 United States

ISBN: (纸本)321183737X

The proper usage and creation of transfer functions for time-varying data sets is an often ignored problem in volume visualization. Although methods and guidelines exist for time-invariant data, little formal study for the timevarying case has been performed. This paper examines this problem, and reports the study that we have conducted to determine how the dynamic behavior of time-varying data may be captured by a single or small set of transfer functions. The criteria which dictate when more than one transfer function is needed were also investigated. Four data sets with different temporal characteristics were used for our study. Results obtained using two different classes of methods are discussed, along with lessons learned. These methods, including a new multiresolution opacity map approach, can be used for semi-automatic generation of transfer functions to explore large-scale time-varying data sets. © VG 2001. All rights reserved.

关键词： Transfer functions

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MoireGraphs: Radial focus+context visualization and interaction for graphs with visual nodes

MoireGraphs: Radial focus+context visualization and interact...

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9th Annual IEEE Symposium on Information visualization, InfoVis 2003

作者： Jankun-Kelly, T.J. Ma, Kwan-Liu Department of Computer Science and Engineering Mississippi State University MS 39762 United States Visualization and Graphics Research Group Department of Computer Science University of California Davis CA 95616 United States

ISBN: (纸本)0780381548

Graph and tree visualization techniques enable interactive exploration of complex relations while communicating topology. However, most existing techniques have not been designed for situations where visual information such as images is also present at each node and must be displayed. This paper presents MoireGraphs to address this need. MoireGraphs combine a new focus+context radial graph layout with a suite of interaction techniques (focus strength changing, radial rotation, level highlighting, secondary foci, animated transitions and node information) to assist in the exploration of graphs with visual nodes. The method is scalable to hundreds of displayed visual nodes. © 2003 IEEE.

关键词： visualization

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Presence-enhancing real walking user interface for first-person video games

Presence-enhancing real walking user interface for first-per...

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2009 ACM SIGGRAPH Symposium on Video Games, Sandbox '09

作者： Steinicke, Frank Bruder, Gerd Hinrichs, Klaus Steed, Anthony Visualization and Computer Graphics Research Group Department of Computer Science University of Munster Einsteinstraße 62 48149 Munster Germany Virtual Environments and Computer Graphics Group Department of Computer Science University College London Gower Street London WC1E 6BT United Kingdom

ISBN: (纸本)9781605585147

For most first-person video games it is important that players have a high level of feeling presence in the displayed game environment. Virtual reality (VR) technologies have enormous potential to enhance gameplay since players can experience the game immersively from the perspective of the player's virtual character. However, the VR technology itself, such as tracking devices and cabling, has until recently restricted the ability of users to really walk over long distances. In this paper we introduce a VR-based user interface for presence-enhancing gameplay with which players can explore the game environment in the most natural way, i. e., by real walking. While the player walks through the virtual game environment, we guide him/her on a physical path which is different from the virtual path and fits into the VR laboratory space. In order to further increase the VR experience, we introduce the concept of transitional environments. Such a transitional environment is a virtual replica of the laboratory environment, where the VR experience starts and which enables a gradual transition to the game environment. We have quantified how much humans can unknowingly be redirected and whether or not a gradual transition to a first-person game via a transitional environment increases the user's sense of presence. © 2009 ACM.

关键词： Virtual reality

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Online reconstruction of textured triangle meshes from aerial images

Online reconstruction of textured triangle meshes from aeria...

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2013 Eurographics Workshop on Urban Data Modelling and Visualisation, UDMV 2013

作者： Vierjahn, Tom Roters, Jan Moser, Manuel Hinrichs, Klaus Mostafawy, Sina Rmh New Media GmbH Cologne Germany Visualization and Computer Graphics Research Group Department of Computer Science University of Muenster Germany Department of Media FH Duesseldorf University of Applied Sciences Germany

ISBN: (纸本)9783905674460

In this paper we present and evaluate a new online reconstruction algorithm to create a textured triangle mesh from a set of aerial images via an unorganized point cloud. Both the point cloud and the mesh are iteratively refined while allowing new aerial images to be added at any time during reconstruction. Texture coordinates are learnt to instantly visualize an initially rough approximation that gets refined as more data becomes available. The new algorithm improves upon other systems that require the complete data to be acquired beforehand, and that apply offline, non-iterative reconstruction and processing. Thus, our algorithm is perfectly suited for time-critical applications, e. g., strategical visualization platforms for disaster and emergency response. © 2013 The Eurographics Association.

关键词： Iterative methods

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Context-based Surface Pattern Completion of Ancient Pottery

Context-based Surface Pattern Completion of Ancient Pottery

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20th Eurographics Workshop on graphics and Cultural Heritage, GCH 2022

作者： Lengauer, Stefan Preiner, Reinhold Sipiran, Ivan Karl, Stephan Tinkl, Elisabeth Bustos, Benjamin Schreck, Tobias Graz University of Technology Institute of Computer Graphics and Knowledge Visualization Austria University of Chile Department of Computer Science Chile University of Graz Institute of Classics Austria

ISBN: (纸本)9783038681786

Among various ancient cultures it was common practice to adorn pottery artifacts with lavish surface decoration. While the applied painting styles, color schemes and displayed mythological content may vary greatly, the presence of simple patterns which appear in a repetitive manner can be observed across civilizations and periods. Such pattern sequences generally are arranged in a structured manner in ornament bands or columns that extend over the entire surface of the object. Due to the poor conservation state of many cultural heritage objects, parts of the surface are oftentimes badly damaged or missing altogether. Yet, if the majority of a pattern sequence is preserved, this information can be leveraged to approximate its missing parts. We present an approach that allows the fully automatic determination of the generation rule inherent to a repetitive surface pattern. Based on this generation rule and the preserved patterns from the same pattern class we propose a workflow for reconstruct missing or damaged parts of the surface painting. We evaluate our approach by applying it to a selection of pottery from ancient Peruvian and Greek cultures, showing that our automatic approach is able to handle a variety of problem cases. © ISVR,2023 *** rights reserved

关键词： computer vision

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