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11th IAPR Conference on Machine Vision Applications, MVA 2009

作者： Divjak, Matjaz Bischof, Horst Inst. for Comp. Graphics and Vision TU Graz Inffeldgasse 16a 8010 Graz Austria

ISBN: (纸本)9784901122092

Living in information society we spend a lot of time in front of visual display units such as comp.ter monitors or TV screens. This has positive as well as negative effects on our lives. Negative effects are mostly health related and one major concern is the increasing number of people affected by the comp.ter Vision Syndrome (CVS) [1], Most CVS-related problems can be avoided by suitable preventive actions, but the majority of comp.ter users ignore them. To help remedy the situation we present a prototype of a comp.ter vision system for real-time eye blink based detection of eye fatigue, which is a common symptom leading towards CVS. Our program records video of the user by a comp.ter monitor mounted web-camera, processes the frames and detects hazardous behaviour based on user s eye dynamics and blink patterns. Experimental results show that the proposed system is capable of detecting common cases of fatigued behaviour linked with long-term comp.ter use. We believe regular use of the proposed system could significantly reduce the CVS symptoms for long-time comp.ter workers. However, the techniques used can also be applied to other similar applications, such as driver fatigue detection, human-comp.ter interaction, etc.

关键词： comp.ter monitors

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Vision pyramids that do not grow too high

Vision pyramids that do not grow too high

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作者： Kropatsch, Walter G. Haxhimusa, Yll Pizlo, Zygmunt Langs, Georg Inst. of Computer Aided Automation Pattern Recog. Image Proc. G. Vienna University of Technology Favoritenstrasse 9 A-1040 Vienna Austria Department of Psychological Sciences Sch. of Elec. and Comp. Engineering Purdue University West Lafayette IN 47907-1364 United States Inst. for Comp. Graphics and Vision Graz University of Technology Inffeldgasse 16 2.OG A-8010 Graz Austria

In irregular pyramids, their vertical structure is not determined beforehand as in regular pyramids. We present three methods, all based on maximal independent sets from graph theory, with the aim to simulate the major sampling properties of the regular counterparts: good coverage of the higher resolution level, not too large sampling gaps and, most importantly, the resulting height, e.g. the number of levels to reach the apex. We show both theoretically and experimentally that the number of vertices can be reduced by a factor of 2.0 at each level. The plausibility of log (diameter) pyramids is supported by psychological and psychophysical considerations. Their technical relevance is demonstrated by enhancing appearance-based object recognition. An irregular pyramid hypothesis generation for robust PCA through top-down attention mechanisms achieves higher speed and quality than regular pyramids and non-pyramidal approaches. © 2004 Elsevier B.V. All rights reserved.

关键词： Object recognition

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Image segmentation and its algorithm based on fuzzy connectedness

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Ruan Jian Xue Bao/Journal of Software 2005年第1期16卷 67-76页

作者： Pan, Jian-Jiang Yang, Xun-Nian Wang, Guo-Zhao Dept. of Math. Inst. of Comp. Graphics Zhejiang Univ. Hangzhou 310027 China

A modification to the fuzzy connectedness image segmentation is presented. Through checking the property affinity between the seed pixel and the pixel along the optimal path which has the largest fuzzy connectedness from the pixel to seed pixel, good results can be achieved, especially for those objects with blurred boundary. Additionally, an image-scanning mechanism algorithm for detecting optimal paths is proposed to calculate the fuzzy connectedness between pixels and the seed pixel one by one. This algorithm can make full use of the properties of fuzzy connectedness and property affinity, and detect the optimal path between two pixels effectively. Experimental examples show that the new method is simple, fast, and works well for some images.

关键词： Image segmentation

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Object recognition and video indexing for media analysis

OGAI Journal (Oesterreichische Gesellschaft fuer Artificial ...

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OGAI Journal (Oesterreichische Gesellschaft fuer Artificial Intelligence) 2005年第1期24卷 4-10页

作者： Ober, Sandra Neuschmied, Helmut Bischof, Horst Wessely, Christian Inst. for Comp. Graphics and Vision TU Graz Inffeldgasse 16/2 8010 Graz Austria Joanneum Research Graz Steyrergasse 17 8010 Graz Austria Institute for Fundamental Theology KFU Graz Attemsgasse 8/4 8010 Graz Austria

This contribution presents a video analysis system which provides automatic content analysis and enables manual and semi-automatic annotation. In particular, we focus on object recognition and visual video indexing. We briefly review the current state of the art based on interest point extraction (e.g. Harris points, Maximally Stable Extremal Regions) and calculation of invariant descriptors around these points (e.g. SIFT, differential invariants). The main challenge for recognition from videos is the efficiency due to the huge size of the database. We will illustrate these concepts on the recently started project, TheoMedia (joint work between TU Graz, Joanneum Research and inst.tute for Fundamental Theology at KFU Graz) where we use recognition and indexing technology for analyzing films in order to find religious symbols. The goal of the project is to use all the available information retrieval technology to substantially speed up the analysis process.

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QSPR analysis of the partitioning of vaporous chemicals in a water-gas phase system and the water solubility of liquid and solid chemicals on the basis of fragment and physicochemical similarity and hybot descriptors

QSPR analysis of the partitioning of vaporous chemicals in a...

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作者： Raevsky, O. Andreeva, E. Raevskaja, O. Skvortsov, V. Schaper, K. Dept. of Comp.-Aided Molec. Design Inst. Physiologically Active Compds. Russian Academy of Sciences Severnii proezd 1 Chernogolovka Moscow Region 142432 Russia Lab. Molec. Graphics and Drug Des. Inst. Biomedicinal Chem. Russ. M. Pogodina Str. 10 Moscow 109018 Russia Division of Structural Biochemistry Research Center Borstel Leibniz Ctr. for Med. and Biosci. Parkallee 1-40 D-23845 Borstel Germany

QSPR analyses of the solubility in water of 558 vapors, 786 liquids and 2045 solid organic neutral chemicals and drugs are presented. Simultaneous consideration of H-bond acceptor and donor factors leads to a good description of the solubility of vapors and liquids. A volume-related term was found to have an essential negative contribution to the solubility of liquids. Consideration of polarizability, H-bond acceptor and donor factors and indicators for a few functional groups, as well as the experimental solubility values of structurally nearest neighbors yielded good correlations for liquids. The application of Yalkowsky's "General Solubility Equation" to 1063 solid chemicals and drugs resulted in a correlation of experimental vs calculated log S values with only modest statistical criteria. Two approaches to derive predictive models for solubility of solid chemicals and drugs were tested. The first approach was based on the QSPR for liquids together with indicator variables for different functional groups. Furthermore, a calculation of enthalpies for intermolecular comp.exes in crystal lattices, based on new H-bond potentials, was carried out for the better consideration of essential solubility-decreasing effects in the solid state, as comp.red with the liquid state. The second approach was based on a combination of similarity considerations and traditional QSPR. Both approaches lead to high quality predictions with average absolute errors on the level of experimental log S determination. © 2005 Taylor & Francis Ltd.

关键词： Solubility

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An improved hybrid genetic algorithm for the generalized assignment problem 04

An improved hybrid genetic algorithm for the generalized ass...

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Applied comp.ting 2004 - Proceedings of the 2004 ACM Symposium on Applied comp.ting

作者： Feltl, Harald Raidl, Günther R. Inst. of Comp. Graphics/Algorithms Vienna University of Technology Vienna Austria

ISBN: (纸本)9781581138122

We consider the generalized assignment problem in which the objective is to find a minimum cost assignment of a set of jobs to a set of agents subject to resource constraints. The presented new approach is based on a previously published, successful hybrid genetic algorithm and includes as new features two alternative initialization heuristics, a modified selection and replacement scheme for handling infeasible solutions more appropriately, and a heuristic mutation operator. Tests are performed on standard test inst.nces from the literature and on newly created, larger and more difficult inst.nces. The presented genetic algorithm with its two initialization variants is comp.red to the previous genetic algorithm and to the commercial general purpose branch-and-cut system CPLEX. Results indicate that CPLEX is able to solve relatively large inst.nces of the general assignment problem to provable optimality. For the largest and most difficult inst.nces, however, the proposed genetic algorithm yields on average the best results in shortest time.

关键词： Linear programming

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Importance-driven volume rendering

Importance-driven volume rendering

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IEEE Visualization 2004 - Proceedings, VIS 2004

作者： Viola, Ivan Kanitsar, Armin Gröller, Meister Eduard Inst. Comp. Graphics and Algorith. Vienna University of Technology Austria

ISBN: (纸本)0780387880

This paper introduces importance-driven volume rendering as a novel technique for automatic focus and context display of volumetric data. Our technique is a generalization of cut-away views, which - depending on the viewpoint - remove or suppress less important parts of a scene to reveal more important underlying information. We automatize and apply this idea to volumetric data. Each part of the volumetric data is assigned an object importance which encodes visibility priority. This property determines which structures should be readily discernible and which structures are less important. In those image regions, where an object occludes more important structures it is displayed more sparsely than in those areas where no occlusion occurs. Thus the objects of interest are clearly visible. For each object several representations, i.e., levels of sparseness, are specified. The display of an individual object may incorporate different levels of sparseness. The goal is to emphasize important structures and to maximize the information content in the final image. This paper also discusses several possible schemes for level of sparseness specification and different ways how object importance can be comp.sited to determine the final appearance of a particular object. ©2004 IEEE.

关键词： Medical imaging

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A semantic approach for user depending information visualization

A semantic approach for user depending information visualiza...

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Proceedings - Eighth International Conference on Information Visualisation, IV 2004

作者： Burmeister, Dirk Grimm, Stephan Haist, Joerg Fraunhofer Inst. for Comp. Graphics Fraunhoferstr. 5 64283 Darmstadt

This paper intends to generalize given techniques in modeling semantic content according to the purpose of transferring them from industrial application scenarios to the requirements of design for all. User groups like deaf people assimilate information in a different manner than hearing ones. In [1] several requirements of deaf users of information visualization are described as a basis for barrier free technology. In this paper the author wants to engross his thesis according to a project he is working for. In the project WIDE [2] two user groups - designers and engineers in industrial product design and development - have different views on the search results according their needs and interests. WIDE is an EU-funded project (IST-2001-34417).

关键词： Information management

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The augmented reality ocular

The augmented reality ocular

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Proceedings VRCAI 2004 - ACM SIGGRAPH International Conference on Virtual Reality Continuum and its Applications in Industry

作者： Lutz, Bernd Becker, Mario Stricker, Didier Bockholt, Uli Fraunhofer Inst. for Comp. Graphics Dept. Virtual and Augmented Reality Fraunhoferstrasse 5 64283 Darmstadt Germany

ISBN: (纸本)1581138849

In this paper we present the Augmented Reality Ocular, an extension of the traditional coin-operated binocular with augmented reality capabilities. The Augmented Reality Ocular enables a real implementation of the augmented reality paradigm and makes the technology available to a large public. After a review of the state of the art and a presentation of current related projects, we describe our approach of implementation. Finally different concept and purpose of applications are described in order to demonstrate the wide field of application of this new augmented reality device.

关键词： Virtual reality

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Generation as method for explorative learning in comp.ter science education

Generation as method for explorative learning in computer sc...

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Proceedings of the 9th Annual SIGCSE Conference on Innovation and Technology in comp.ter Science Education

作者： Kerren, Andreas Inst. Comp. Graphics and Algorith. Vienna University of Technology Favoritenstraße 9-11 A-1040 Vienna Austria

ISBN: (纸本)1581138369

The use of generic and generative methods for the development and application of interactive educational software is a relatively unexplored area in industry and education. Advantages of generic and generative techniques are, among other things, the high degree of reusability of systems parts and the reduction of development costs. Furthermore, generative methods can be used for the development or realization of novel learning models. In this paper, we discuss such a learning model that propagates a new way of explorative learning in comp.ter science education with the help of generators. A realization of this model represents the educational software GANIFA on the theory of generating finite automata from regular expressions. In addition to the educational system's description, we present an evaluation of this system.

关键词： Learning systems

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