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Efficient contour line labelling for terrain modelling

Efficient contour line labelling for terrain modelling

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33rd Australasian computer science Conference, ACSC 2010

作者： Xie, Xin Wünsche, Burkhard C. Graphics Group Department of Computer Science University of Auckland Private Bag 92019 Auckland 1142 New Zealand

ISBN: (纸本)9781920682835

Terrains are an essential part of outdoor environments. Terrain models are important for computer games and applications in architecture, urban design and archaeology. A popular and intuitive way to represent terrains is by contour maps. In order to render such representations in 3D the contours must be labelled with height values and converted to Digital Elevation Maps (DEM), which are regular grids of height values and are represented as gray scale images. The labelling of contour lines is time intensive for large maps and prone to errors. In this paper we present an efficient and novel algorithm for semiautomatically labelling contour maps and for converting them to DEMs. The algorithm first identifies point extrema which must be labelled by the user. The point extrema are connected by a graph and the contour lines crossed by edges are labelled automatically. We show that ambiguities can exist for so-called line extrema. Our algorithms will resolve ambiguous regions requiring a minimal number of additional user inputs. We also present a more efficient graph representation, which requires about 10-20% more user inputs than the optimal case. After the contour lines are labelled, the contour map is triangulated and the height value at each point of the DEM is computed using a bilinear interpolation. The presented algorithm is efficient, requires minimal user inputs, and produces good quality DEMs. We present several examples, discuss its suitability for different applications, and provide a complexity analysis. Copyright © 2010, Australian computer Society, Inc.

关键词： computer games

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Life-Sketch - A Framework for Sketch-Based Modelling and Animation of 3D Objects

Life-Sketch - A Framework for Sketch-Based Modelling and Ani...

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11th Australasian User Interface Conference, AUIC 2010

作者： Yang, Rong Wünsche, Burkhard C. Graphics Group Department of Computer Science University of Auckland Private Bag 92019 Auckland 1142 New Zealand

ISBN: (纸本)9781920682873

The design and animation of digital 3D models is an essential task for many applications in science, engineering, education, medicine and arts. In many instances only an approximate representation is required and a simple and intuitive modelling and animation process, suitable for untrained users, is more important than realism and extensive features. Sketch-based modelling has been shown to be a suitable interface because the underlying pen-and-paper metaphor is intuitive and effective. In this paper we present LifeSketch, a framework for sketched-based modelling and animation. Threedimensional models are created with a variation of the popular "Teddy" algorithm. The models are analysed and skeletons with joints are extracted fully automatically. The surface mesh is bound to the curved skeletons using skinning techniques and the resulting model can be animated using skeletal animation methods. The results of our evaluation and user study suggest that modelling and animation tasks are considerable more efficient than with traditional tools. The learning curve is very flat and a half page document was sufficient to familiarise users with the tools functionality. Users were satisfied with the automatically extracted joints, but some users struggled selecting the appropriate rotation axes and angles for animating the resulting 3D objects. A more intuitive, preferable automatic or sketch-based approach for animations is needed. Overall users were satisfied with the modelling capabilities of the tool, found most of its functionality natural and intuitive, and they enjoyed using it. © 2010, Australian computer Society, Inc.

关键词： Animation

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Contract Search: Heuristic Search under Node Expansion Constraints 2nd

Contract Search: Heuristic Search under Node Expansion Const...

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19th European Conference on Artificial Intelligence (ECAI)/6th Conference on Prestigious Applications of Intelligent Systems (PAIS)

作者： Aine, Sandip Chakrabarti, P. P. Kumar, Rajeev Mentor Graphics Pvt. Ltd. United States Department of Computer Science and Engineering Indian Institute of Technology Kharagpur India

ISBN: (纸本)9781607506058

In this work, we present a heuristic search technique (Contract Search) which can be automatically adapted for a specified node expansion limitation. We analyze the node expansion properties of best first search and propose a probabilistic model (rank profile) to characterize heuristic search under restricted expansions. We identify the basic properties of the rank profile and establish its relation with the search space configuration. In Contract Search, we use the rank profile model to formulate an optimal strategy to choose level dependent restriction bounds maximizing the probability of obtaining the goal node under the specified contract. Experimental comparison with anytime search techniques like ARA* and beam search shows that Contract Search outperforms these techniques over a range of constraint specifications.

关键词： Expansion

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Techniques for view transition in multi-camera outdoor environments

Techniques for view transition in multi-camera outdoor envir...

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36th graphics Interface Conference, GI 2010

作者： Veas, Eduardo Mulloni, Alessandro Kruijff, Ernst Regenbrecht, Holger Schmalstieg, Dieter Institute for Computer Graphics and Vision Graz University of Technology Austria Department of Information Science University of Otago New Zealand

ISBN: (纸本)9781568817125

Environment monitoring using multiple observation cameras is increasingly popular. Different techniques exist to visualize the incoming video streams, but only few evaluations are available to find the best suitable one for a given task and context. This article compares three techniques for browsing video feeds from cameras that are located around the user in an unstructured manner. The techniques allow mobile users to gain extra information about the surroundings, the objects and the actors in the environment by observing a site from different perspectives. The techniques relate local and remote cameras topologically, via a tunnel, or via bird's eye viewpoint. Their common goal is to enhance spatial awareness of the viewer, without relying on a model or previous knowledge of the environment. We introduce several factors of spatial awareness inherent to multi-camera systems, and present a comparative evaluation of the proposed techniques with respect to spatial understanding and workload.

关键词： Cameras

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Would you do that? - Understanding social acceptance of gestural interfaces

Would you do that? - Understanding social acceptance of gest...

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12th International Conference on Human-computer Interaction with Mobile Devices and Services, Mobile HCI2010

作者： Montero, Calkin S. Alexander, Jason Marshall, Mark T. Subramanian, Sriram Interaction and Graphics Group Department of Computer Science University of Bristol Woodland Road BS81UB United Kingdom

ISBN: (纸本)9781605588353

With gesture-based interactions in mobile settings becoming more popular, there is a growing concern regarding the social acceptance of these interaction techniques. In this paper we begin by examining the various definitions of social acceptance that have been proposed in the literature to synthesize a definition that is based on how the user feels about performing a particular interaction as well as how the bystanders perceive the user during this interaction. We then present the main factors that influence gestures' social acceptance including culture, time, interaction type and the user's position on the innovation adoption curve. Through a user study we show that an important factor in determining social acceptance of gesture-based interaction techniques is the user's perception of others ability to interpret the potential effect of a manipulation. © 2010 ACM.

关键词： Social aspects

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Registration of multichannel images using Geometric Algebra

Registration of multichannel images using Geometric Algebra

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2nd International Workshop on computer graphics, computer Vision and Mathematics, GraVisMa 2010

作者： Görlitz, Andreas Seibert, Helmut Hildenbrand, Dietmar Darmstadt University of Technology Department of Computer Science Hochschulstr. 10 64289 Darmstadt Germany Fraunhofer Institute for Computer Graphics Research Fraunhoferstr. 5 64283 Darmstadt Germany

ISBN: (纸本)9788086943855

Geometric Algebra (GA) is a mathematical framework that allows a compact and geometrically intuitive description of geometric relationships and algorithms. In this paper a translation, rotation and scale invariant algorithm for registration of color images and other multichannel data is introduced. The use of Geometric Algebra allows to generalize the well known Fourier Transform which is widely used for the registration of scalar fields. In contrast to the original algorithm our algorithm allows to handle vector valued data in an appropriate way. As a proof of concept the registration results for artificial, as well as for real world data, are discussed.

关键词： Genetic algorithms

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A set of multi-touch graph interaction techniques 10

A set of multi-touch graph interaction techniques

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ACM International Conference on Interactive Tabletops and Surfaces

作者： Schmidt, Sebastian Nacenta, Miguel A. Dachselt, Raimund Carpendale, Sheelagh Department of Computer Science InnoVis Group University of Calgary Canada User Interface and Software Engineering Group Department of Simulation and Graphics University of Magdeburg Germany

ISBN: (纸本)9781450303996

Interactive node-link diagrams are useful for describing and exploring data relationships in many domains such as network analysis and transportation planning. We describe a multi-touch interaction technique set (IT set) that focuses on edge interactions for node-link diagrams. The set includes five techniques (TouchPlucking, TouchPinning, TouchStrum-ming, TouchBundling and PushLens) and provides the flexibility to combine them in either sequential or simultaneous actions in order to address edge congestion. © 2010 ACM.

关键词： Graph theory

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Fast texture segmentation based on semi-local region descriptor and active contour driven by the Bhattacharyya distance

Fast texture segmentation based on semi-local region descrip...

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International Conference on Multimedia Information Networking and Security

作者： Zhang, Shanqing Xin, Weibin Zhang, Guixu Institute of Graphics and Image Hangzhou Dianzi University Hangzhou China Department of Computer Science and Technology East China Normal University Shanghai China

ISBN: (纸本)9780769542584

Based on a texture descriptor which intrinsically defines the geometry of textures using semi-local image information and tools from differential geometry, a fast active contour segmentation model for color texture image is proposed. In this model, we use the popular Bhattacharyya distance between the probability density function (pdf) to design the data fitting term which distinguishes the background and textures of interest. Then, a fast algorithm based on the Split-Bregman method is introduced to extract meaningful objects. Finally, some examples on some challenging images are illustrated to verify the possibility of the proposed model. © 2010 IEEE.

关键词： Image segmentation

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PhysicsBox: Playful educational tabletop games 10

PhysicsBox: Playful educational tabletop games

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ACM International Conference on Interactive Tabletops and Surfaces

作者： Langner, Ricardo Brosz, John Dachselt, Raimund Carpendale, Sheelagh User Interface and Software Engineering Group Department of Simulation and Graphics University of Magdeburg Germany Interactions Lab. Department of Computer Science InnoVis Group Canada

ISBN: (纸本)9781450303996

We present PhysicsBox, a collection of three multi-touch, physics-based, educational games. These games, based on concepts from elementary science have been designed to provide teachers with tools to enrich lessons and support experimentation. PhysicsBox combines two current trends, the introduction of multi-touch tabletops into classrooms and research on the use of simulated physics in tabletop applications. We also provide a Java library that supports hardware independent multi-touch event handling for several tabletops. © 2010 ACM.

关键词： Teaching

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Techniques for precision-based visual analysis of projected data

Techniques for precision-based visual analysis of projected ...

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作者： Schreck, Tobias Von Landesberger, Tatiana Bremm, Sebastian Department of Computer Science Technische Universitaet Darmstadt FG GRIS Fraunhoferstrasse 5 Darmstadt Hessen 64283 Germany Fraunhofer Institute for Computer Graphics Research IGD Fraunhoferstrasse 5 D-64283 Darmstadt Germany

The analysis of high-dimensional data is an important, yet inherently difficult problem. Projection techniques such as Principal Component Analysis, Multi-dimensional Scaling and Self-Organizing Map can be used to map high-dimensional data to 2D display space. However, projections typically incur a loss in information. Often, uncertainty exists regarding the precision of the projection as compared with its original data characteristics. While the output quality of these projection techniques can be discussed in terms of aggregate numeric error values, visualization is often helpful for better understanding the projection results. We address the visual assessment of projection precision by an approach integrating an appropriately designed projection precision measure directly into the projection visualization. To this end, a flexible projection precision measure is defined that allows the user to balance the degree of locality at which the measure is evaluated. Several visual mappings are designed for integrating the precision measure into the projection visualization at various levels of abstraction. The techniques are implemented in an interactive system, including methods supporting the user in finding appropriate settings of relevant parameters. We demonstrate the usefulness of the approach for visual analysis of classified and unclassified high-dimensional data sets. We show how our interactive precision quality visualization system helps to examine the preservation of original data properties in projected space. © 2010 Macmillan Publishers Ltd.

关键词： Visualization

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