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SPM 2005 - ACM Symposium on Solid and Physical Modeling

作者： Akleman, Ergun Chen, Jianer Visualization Sciences Program Texas A and M University Computer Science Department Texas A and M University Visualization Sciences Program Department of Architecture College of Architecture 418 Langford Center C College Station TX 77843-3137

ISBN: (纸本)9781595930156

This paper presents our preliminary results on regular meshes in which all faces have the same size and all vertices have the same valence. A regular mesh is denoted by (n, m, g) where n is the number of the sides of faces, m is the valence of vertices and g is the genus of the mesh. For g = 0, regular meshes include regular platonic solids, all two sided polygons. For g = 1 regular meshes include regular tilings of infinite plane. Our work shows that there exist infinitely many regular meshes for g > 1. Moreover, we have constructive proofs that describe how to create high genus regular meshes that consist of triangles and quadrilaterals (3,m,g) and (4,m,g). Copyright © 2005 by the Association for Computing Machinery, Inc.

关键词： Image segmentation

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Ecological research can augment restoration practice in urban areas degraded by invasive species-examples from Chicago Wilderness

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Urban Ecosystems 2009年第1期12卷 63-77页

作者： Heneghan, Liam Umek, Lauren Bernau, Brad Grady, Kevin Iatropulos, Jamie Jabon, David Workman, Margaret Environmental Science Program DePaul University Chicago IL 60614 2325 North Clifton Avenue United States Scientific Data Analysis and Visualization Program DePaul University Chicago United States

Urban biodiversity conservation needs a firm scientific foundation, one that draws upon active and regionally calibrated research programs. Until recently this foundation has not existed. In this paper we examine the way in which the emerging discipline of restoration ecology in an urban context can learn from the experiences of ongoing restoration projects and in turn how novel insights from research of urban soils can help these projects define and reach their goals. Limitations on collaboration between academic researchers and practitioners continues be problematic. We discuss a model whereby this impediment may be removed. A case study of Rhamnus cathartica, an invader of Midwestern woodlands which modifies some important soil ecosystem properties will be used to illustrate the potential for engagement between research and practice. © 2008 Springer science+Business Media, LLC.

关键词： Buckthorn Ecology and management Interdisciplinary research Invasive species Restoration Rhamnus cathartica Soil restoration Urban ecology

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A novel way to conduct human studies and do some good

A novel way to conduct human studies and do some good

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28th Annual CHI Conference on Human Factors in Computing Systems, CHI 2010

作者： Buddharaju, Pradeep Fujiki, Yuichi Pavlidis, Ioannis Akleman, Ergun Dept. of Computer Science University of Houston Houston TX 77204 United States Visualization Sciences Program Texas A and M University College Station TX 77843 United States

ISBN: (纸本)9781605589312

In this paper the authors describe a novel way to conduct large-scale human studies achieving the maximum outreach and impact with the minimum cost. An iPhone health application, 'Walk n' Play', was developed and released for free in the App Store. The application measures calories spent due to walking activities through the iPhone's accelerometer. It is a real-time awareness tool that helps people to keep their sedentariness in check. Furthermore, it uses motivational mechanisms based on buddy support/competition and social networking to increase daily physical activity. The anonymous data gathered from thousands of users around the world, reveal patterns of human behavior at a resolution and scale not feasible before. © 2010 Copyright is held by the author/owner(s).

关键词： Smartphones

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3-D reconstruction of digital outcrop model based on multiple view images and terrestrial laser scanning 16

3-D reconstruction of digital outcrop model based on multipl...

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16th Brazilian Symposium on GeoInformatics, GEOINFO 2015

作者： Da Silva, Reginaldo Macedônio Veronez, Maurício Roberto Gonzaga, Luiz Tognoli, Francisco M.W. De Souza, Marcelo Kehl Inocencio, Leonardo Campos VIZLab Advanced Visualization Laboratory UNISINOS São LeopoldoRS Brazil PPGEO Graduate Program on Geology UNISINOS São LeopoldoRS Brazil PIPCA Applied Computer Science Graduate Program - UNISINOS São LeopoldoRS Brazil

This paper presents a comparative study about 3D reconstruction based on active and passive sensors, mainly LiDAR - Terrestrial Laser Scanner (TLS) and raster images (photography), respectively. An accuracy analysis has been performed in the positioning of outcrop point clouds obtained by both techniques. To make the comparison feasible, datasets are composed by point clouds generated from multiple images in different poses using a consumer digital camera and directly by terrestrial laser scanner. After preprocessing stages to obtain these point clouds, both are compared, through the positional discrepancies and standard deviation. A preliminary analysis has been shown the feasible employment of digital image jointly 3D reconstruction method for digital outcrop modeling, concerning with data acquisition at low cost without significantly lost of accuracy when compared with LiDAR. © 2015 National Institute for Space Research INPE All rights reserved.

关键词： Image reconstruction

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Local mesh operators: extrusions revisited

Local mesh operators: extrusions revisited

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International Conference on Shape Modeling and Applications

作者： E. Landreneau E. Akleman Vinod Srinivasan Computer Science Department USA Visualization Sciences Program Texas A and M University USA

In this paper, we present a set of generalized "local" mesh operators. Local operators are those that operate on a single face without affecting the rest of the mesh. Boundary edges of the chosen face also stay the same. We have identified two types of local operators: (1) Extrusions that create generalized pipes in which bottom and top polygons have the same number of sides, and (2) Stellations that create generalized pyramids, where there is a top vertex instead of top polygon. Our operators can create extrusions that are regular polyhedra including dodecahedron, icosa-hedron, octahedron and tetrahedron. The tetrahedron is created using the stellation operator, which is also useful to create generalized versions of Kepler and Poinsot solids.

关键词： visualization Solids Shape Computer science Application software

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Interactive construction of multi-segment curved handles

Interactive construction of multi-segment curved handles

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Pacific Conference on Computer Graphics and Applications

作者： V. Srinivasan E. Akleman Jianer Chen Visualization Science Program Texas A and M University USA Department of Computer Science Texas A and M University USA

In this work, we present a method to interactively create multi-segment, curved handles between two star-shaped faces of an orientable 2-manifold mesh or to connect two 2-manifold meshes along such faces. The presented algorithm combines a very simple 2D morphing algorithm with Hermite interpolation to construct the handle. Based on the method, we have developed a user interface tool that allows users to simply and easily create multi-segment curved handles.

关键词： Shape Computer graphics User interfaces Joining processes Mathematical model visualization Computer science Interpolation Algorithm design and analysis Application software

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An optical technique for the large-scale graphene recognition and quality control

An optical technique for the large-scale graphene recognitio...

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Frontiers in Optics, FiO 2010

作者： Nolen, Craig M. Teweldebrhan, Desalegne Denina, Giovanni Bhanu, Bir Balandin, Alexander A. Nano-Device Laboratory Department of Electrical Engineering and Materials Science and Engineering Program Bourns College of Engineering University of California-Riverside Riverside CA 92521 United States Visualization and Intelligent Systems Laboratory Department of Electrical Engineering and Materials Science and Engineering Program Bourns College of Engineering University of California-Riverside Riverside CA 92521 United States

We describe a fast and efficient method for recognition and quality control of the largearea graphene layers based on image processing algorithms. Results show that our technique is accurate and has potential for indu... 详细信息

关键词： Quality control

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Semiregular pentagonal subdivisions

Semiregular pentagonal subdivisions

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International Conference on Shape Modeling and Applications

作者： E. Akleman V. Srinivasan Z. Melek P. Edmundson Visualization Sciences Program Department of Architecture Texas A and M University College Station TX USA Visualization Sciences Program Texas A and M University USA Computer Science Department Texas A and M University USA

Triangular and quadrilateral meshes are commonly used in computer graphics applications. We analyze the topological existence of meshes that consist of n-sided faces where n is greater than 4 such as pentagonal and hexagonal meshes. We show that it is possible to represent any 2-manifold with a mesh that is made up of only pentagons. We also show that the meshes that consist of only polygons with more than five sides cannot represent all 2-manifolds. We present a pentagonalization (or pentagonal conversion) scheme that can create a pentagonal mesh from any arbitrary mesh structure. We also introduce a pentagonal preservation scheme that can create a pentagonal mesh from any pentagonal mesh.

关键词： Application software Shape Computer graphics Computer science Data visualization Surface waves

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Gesture and response in field-based performance

Gesture and response in field-based performance

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Creativity and Cognition Proceedings 2005

作者： Wei, Sha Xin Gill, Satinder Topological Media Lab Graphics Visualization and Usability Center Georgia Institute of Technology Cambridge United Kingdom Program in Science Technology and Society Massachusetts Institute of Technology Cambridge United Kingdom Interaction Design Centre School of Computing Science Middlesex University London United Kingdom Centre for Music and Science Cambridge United Kingdom

ISBN: (纸本)1595930256

Ambience and immersive technological environments allow us to explore some basics of human pragmatics that lie beyond linguistics, intentionality and the subject-agency perspectives of human interaction. We focus on gesture and the body in sense-making and propose a discussion drawing on a non-dualist and agent-free account of embodied, material experience. By agent-free we mean an approach that does not presume a monolithic subject. Moreover, we deal with the problem of intersubjectivity by studying the human coordination of activity without appealing to a transmission theory of communication. [6] We achieve this by considering how gesture spans multiple bodies and how aesthetic design works with this and facilitates it. The paper is in two parts, the first part covers movement studies, focusing on gesture and body movement, drawing on the acting and pragmatics, and the second part develops this with the example of the TGarden, a responsive play space for experimental performance augmented by gesturally nuanced computational media. Copyright 2005 ACM.

关键词： Gesture recognition

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Two methods for creating chinese painting

Two methods for creating chinese painting

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Pacific Conference on Computer Graphics and Applications

作者： Ching Chan E. Akleman Jianer Chen Visualization Sciences Program Texas A and M University USA Department of Computer Science Texas A and M University USA

We present two methods to create realistic Chinese painting. The first method is to create 3D Chinese painting animation using existing software packages. The second method is an expressive paint tool which allows an ... 详细信息

ISBN: (纸本)0769517846

关键词： Painting Brushes Ink Art visualization Animation Computer science Software packages Paints Animals

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