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Stabilization and visual analysis of video-recorded sailing sessions

Visual Computing for Industry,Biomedicine,and Art 2021年第1期4卷 258-267页

作者： Gijs M.W.Reichert Marcos Pieras Ricardo Marroquim Anna Vilanova Computer Graphics and Visualization Technical University DelftDelft 2628CDThe Netherlands Visualization Group Technical University EindhovenEindhovenAZ 5612The Netherlands

One common way to aid coaching and seek to improve athletes’performance is by recording training sessions for posterior *** the case of sailing,coaches record videos from another boat,but usually rely on handheld devices,which may lead to issues with the footage and missing important *** the other hand,by autonomously recording the entire session with a fixed camera,the analysis becomes challenging owing to the length of the video and possible stabilization *** this work,we aim to facilitate the analysis of such full-session videos by automatically extracting maneuvers and providing a visualization framework to readily locate interesting ***,we address issues related to image ***,an evaluation of the framework points to the benefits of video stabilization in this scenario and an appropriate accuracy of the maneuver detection method.

关键词： visualization Sports Visual-analytics

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On-Tube Attribute visualization for Multivariate Trajectory Data

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IEEE Transactions on visualization and computer graphics 2023年第1期29卷 1288-1298页

作者： Russig, Benjamin Grab, David Dachselt, Raimund Gumhold, Stefan Department of Computer Graphics and Visualization TU Dresden Germany TU Dresden Interactive Media Lab Germany

Stylized tubes are an established visualization primitive for line data as encountered in many scientific fields, ranging from characteristic lines in flow fields, fiber tracks reconstructed from diffusion tensor imaging, to trajectories of moving objects as they arise from cyber-physical systems in many engineering disciplines. Typical challenges include large data set sizes demanding for efficient rendering techniques as well as a large number of attributes that cannot be mapped simultaneously to the basic visual attributes provided by a tube-based visualization. In this work, we tackle both challenges with a new on-tube visualization approach. We improve recent work on high-quality GPU ray casting of Hermite spline tubes supporting ambient occlusion and extend it by a new layered procedural texturing technique. In the proposed framework, a large number of data set attributes can be mapped simultaneously to a variety of glyphs and plots that are embedded in texture space and organized in layers. Efficient rendering with minimal data transfer is achieved by generating the glyphs procedurally and drawing them in a deferred shading pass. We integrated these techniques in a prototype visualization tool that facilitates flexible mapping of data set attributes to visual tube and glyph attributes. We studied our approach on a variety of example data from different fields and found it to provide a highly adaptable and extensible toolbox to quickly craft tailor-made tube-based trajectory visualizations. © 2022 IEEE.

关键词： Trajectories

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Modeling surfaces of arbitrary topology using manifolds 95

Modeling surfaces of arbitrary topology using manifolds

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Proceedings of the 22nd Annual ACM Conference on computer graphics and Interactive Techniques

作者： Grimm, Cindy M. Hughes, John F. The Science and Technology Center for Computer Graphics and Scientific Visualization

ISBN: (纸本)9780897917018

We describe an extension of B-splines to surfaces of arbitrary topology, including arbitrary boundaries. The technique inherits many of the properties of B-splines: local control, a compact representation, and guaranteed continuity of arbitrary degree. The surface is specified using a polyhedral control mesh instead of a rectangular one;the resulting surface approximates the polyhedral mesh much as a B-spline approximates its rectangular control mesh. Like a B-spline, the surface is a single, continuous object. This is achieved by modeling the domain of the surface with a manifold whose topology matches that of the polyhedral mesh, then embedding this domain into 3-space using a basis-function/control-point formulation. We provide a constructive approach to building a manifold.

关键词： computer graphics

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VR techniques for the investigation of molecule data

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computerS & graphics 1996年第2期20卷 207-217页

作者： Haase, H Strassner, J Dai, F Department of Visualization and Simulation Fraunhofer Institute for Computer Graphics (Fraunhofer IGD) Wilhelminenstr. 7 D-64283 Darmstadt Germany

This paper describes a system for investigating molecule data. By means of combined Virtual Environment and Scientific visualization techniques it allows for immersive exploration of individual molecules as well as for investigation of docking behaviour between two molecules. Special emphasis is put on good interaction (simultaneous operation of two input devices with 6 degrees of freedom each, virtual menus), on fast rendering of large molecules in high quality (level of detail, fast rendering of spheres, utilization of multiple rendering pipelines, sorted triangle strips for transparent surfaces), and on other perceptual issues (e.g. judgement of position and size of molecules by shadows). The techniques which were realized for this system may also be used in other applications like assembly tasks, virtual material testing, etc. (C) 1996 Elsevier Science Ltd

关键词： Virtual reality

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miWFC - Designer Empowerment through mixed-initiative Wave Function Collapse 22

miWFC - Designer Empowerment through mixed-initiative Wave F...

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17th International Conference on the Foundations of Digital Games, FDG 2022

作者： Langendam, Thijmen Stefanus Leendert Bidarra, Rafael Computer Graphics and Visualization Delft University of Technology Netherlands

ISBN: (纸本)9781450397957

Wave Function Collapse (WFC) is a powerful generative algorithm, able to create locally-similar output based on a single example input. One of the inherent limitations of the original WFC is that it often requires users to understand its inner workings, and possibly make their own ad-hoc mods, to achieve satisfactory results. Besides distracting from your creative task, this strongly reduces the algorithm's effective usefulness to a small group of technical users. We propose miWFC, a novel mixed-initiative approach to WFC aimed at overcoming these drawbacks. Its main focus is on providing intuitive control to its users, in a way that matches their usual creative workflow. Among its main features, this approach provides (i) interactive navigation through design history, including controlled backtracking, (ii) precise manual editing of the output for direct expression of design intent, and (iii) interactive manipulation of tile weights, to tweak the global appearance of the output. We evaluated a prototype implementation of our approach among game artists and other creative professionals, and concluded that its features were largely considered useful and supportive of their creative work. © 2022 Owner/Author.

关键词： Human computer interaction

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Rendering on Tiled Displays using Advanced Stream Caching

Rendering on Tiled Displays using Advanced Stream Caching

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13th Eurographics Symposium on Virtual Environments, EGVE 2007

作者： Lorenz, Mario Brunnett, Guido Heinz, Marcel Computer Graphics and Visualization Chemnitz University of Technology Germany

ISBN: (纸本)9783905673647

To render complex scenes on tiled displays efficiently modifications to the Chromium framework have been proposed that lead to significant lower processor and memory load on the client and a very effective utilization of available network bandwidth. To avoid redundant transmissions of identical command sequences that are generated by the application a transparent stream cache can be used that accelerates the multicast communication channel. It can be profiled that applications that do not use display lists or VBO's to control the rendering put a heavy load on the client host because the cache control has to compute a checksum for the identification of repeated command sequences. In this paper we analyse the possibilities to improve the stream caching for unmodified GL applications. As our main result we introduce a new GL extension to control the stream cache with minimally modified applications. © The Eurographics Association 2007.

关键词： Rendering (computer graphics)

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Linear algebra operators for GPU implementation of numerical algorithms 05

Linear algebra operators for GPU implementation of numerical...

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ACM SIGGRAPH 2005 International Conference on computer graphics and Interactive Techniques, SIGGRAPH 2005

作者： Krüger, Jens Westermann, Rüdiger Computer Graphics and Visualization Group Technical University Munich Germany

ISBN: (纸本)9781450378338

In this work, the emphasis is on the development of strategies to realize techniques of numerical computing on the graphics chip. In particular, the focus is on the acceleration of techniques for solving sets of algebraic equations as they occur in numerical simulation. We introduce a framework for the implementation of linear algebra operators on programmable graphics processors (GPUS), thus providing the building blocks for the design of more complex numerical algorithms. In particular, we propose a stream model for arithmetic operations on vectors and matrices that exploits the intrinsic parallelism and efficient communication on modern GPUS. Besides performance gains due to improved numerical computations, graphics algorithms benefit from this model in that the transfer of computation results to the graphics processor for display is avoided. We demonstrate the effectiveness of our approach by implementing direct solvers for sparse matrices, and by applying these solvers to multi-dimensional finite difference equations, i.e. the 2D wave equation and the incompressible Navier-Stokes equations. © ACM, 2003.

关键词： Navier Stokes equations

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Designing procedurally generated levels

Designing procedurally generated levels

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9th AAAI Conference on Artificial Intelligence and Interactive Digital Entertainment, AIIDE 2013 Workshop

作者： Van Linden, Roland Der Lopes, Ricardo Bidarra, Rafael Computer Graphics and Visualization Group Delft University of Technology Netherlands

ISBN: (纸本)9781577356356

There is an increasing demand to improve the procedural generation of game levels. Our approach empowers game designers to author and control level generators, by expressing gameplay-related design constraints. Graph grammars, resulting from these designer-expressed constraints, can generate sequences of desired player actions as well as their associated target content. These action graphs are used to determine layouts and content for game levels. We showcase this approach with a case study on a dungeon crawler game. Results allow us to conclude that our control mechanisms are both expressive and powerful, effectively supporting designers to procedurally generate levels. Copyright © 2013, Association for the Advancement of Artificial Intelligence. All rights reserved.

关键词： Formal languages

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DuoDecim: A structure for point scan compression and rendering

DuoDecim: A structure for point scan compression and renderi...

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Eurographics/IEEE VGTC Symposium on Point-Based graphics, 2005

作者： Krüger, Jens Schneider, Jens Westermann, Rüdiger Computer Graphics and Visualization Group Technical University Munich Germany

ISBN: (纸本)3905673207

In this paper we present a compression scheme for large point scans including per-point normals. For the encoding of such scans we introduce a particular type of closest sphere packing grids, the hexagonal close packing (HCP). HCP grids provide a structure for an optimal packing of 3D space, and for a given sampling error they result in a minimal number of cells if geometry is sampled into these grids. To compress the data, we extract linear sequences (runs) of filled cells in HCP grids. The problem of determining optimal runs is turned into a graph theoretical one. Point positions and normals in these runs are incrementally encoded. At a grid spacing close to the point sampling distance, the compression scheme only requires slightly more than 3 bits per point position. Incrementally encoded per-point normals are quantized at high fidelity using only 5 bits per normal (see Figure 1). The compressed data stream can be decoded in the graphics processing unit (GPU). Decoded point positions are saved in graphics memory, and they are then used on the GPU again to render point primitives. In this way we render gigantic point scans from their compressed representation in local GPU memory at interactive frame rates (see Figure 2). © The Eurographics Association 2005.

关键词： Image compression

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A generic method for classification of player behavior

A generic method for classification of player behavior

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9th AAAI Conference on Artificial Intelligence and Interactive Digital Entertainment, AIIDE 2013 Workshop

作者： Etheredge, Marlon Lopes, Ricardo Bidarra, Rafael Computer Graphics and Visualization Group Delft University of Technology Netherlands

ISBN: (纸本)9781577356356

Player classification allows for considerable improvements on both game analytics and game adaptivity. With this paper we aim at reversing the ad-hoc tendency in player classification methods, by proposing an approach to player classification that can be integrated across different games and genres and is particularly suited to be used by game designers. This paper describes our generic method of interaction-based player classification, which consists of three components: (i) intercepting player interactions, (ii) finding player types through fuzzy cluster analysis and (iii) classification using Hidden Markov Models (HMM). To showcase our method we developed Blindmaze, a simple web-based hidden maze game publicly available, featuring a bounded set of interactions. All data collected from a game is interaction-based, requiring minimal implementation effort from the game developers. It is concluded that our method makes player classification even more available by making it generic and reusable across different games. Copyright © 2013, Association for the Advancement of Artificial Intelligence. All rights reserved.

关键词： Cluster analysis

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