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2009 IADIS International Conference Interfaces and Human computer Interaction, IHCI 2009 and IADIS International Conference Game and Entertainment Technologies, GET 2009 - Part of the 3rd IADIS Multi Conference on computer science and Information Systems, MCCSIS 2009

作者： Schlattmann, Markus Broekelschen, Johannes Klein, Reinhard University of Bonn Institute of Computer Science II Computer Graphics Germany

ISBN: (纸本)9789728924850

Recently, stable markerless 6 DOF video-based hand-tracking devices became available. These devices simultaneously track the positions and orientations of both user hands in different postures with at least 40 frames per second. Such hand-tracking allows for using the human hands as natural input devices. To exploit these devices for interaction with an application, suitable interaction interfaces and techniques are required. Especially in the field of 3D gaming further developments and analyses of bare-handed interaction are needed. Therefore, we introduce a novel general interface for gaming purposes and analyzed various interaction modes/metaphors by coupling it to three popular 3D games (see Figure 1): a racing game, a flight simulator and a first-person shooter. Furthermore, we present an evaluation and discussion based on an informal user study. © 2009 IADIS Multi Conference on computer science and Information Systems

关键词： Flight simulators

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Interactive steering of mesh animations 11

Interactive steering of mesh animations

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11th ACM SIGGRAPH / Eurographics Symposium on computer Animation, SCA 2012

作者： Vögele, Anna Hermann, Max Krüger, Björn Klein, Reinhard Bonn University Institute of Computer Science II Computer Graphics Germany

ISBN: (纸本)9783905674378

Creating geometrically detailed mesh animations is an involved and resource-intensive process in digital content creation. In this work we present a method to rapidly combine available sparse motion capture data with existing mesh sequences to produce a large variety of new animations. The key idea is to model shape changes correlated to the pose of the animated object via a part-based statistical shape model. We observe that compact linear models suffice for a segmentation into nearly rigid parts. The same segmentation further guides the parameterization of the pose which is learned in conjunction with the marker movement. Besides the inherent high geometric detail, further benefits of the presented method arise from its robustness against errors in segmentation and pose parameterization. Due to efficiency of both learning and synthesis phase, our model allows to interactively steer virtual avatars based on few markers extracted from video data or input devices like the Kinect sensor. © The Eurographics Association 2012.

关键词： Animation

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A multi-camera, multi-projector super-resolution framework for structured light

A multi-camera, multi-projector super-resolution framework f...

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International Conference on 3D Imaging, Modeling, Processing, Visualization and Transmission

作者： Weinmann, Michael Schwartz, Christopher Ruiters, Roland Klein, Reinhard Institute of Computer Science II - Computer Graphics University of Bonn Bonn Germany

ISBN: (纸本)9780769543697

In this work, we present a framework for multicamera, multi-projector object acquisition based on structured light. This approach allows the reconstruction of an object without moving either the object or the acquisition setup, avoiding any registration of independent measurements. To overcome the resolution limitations of the individual projectors, we introduce a novel super-resolution scheme. By exploiting high dynamic range imaging, we are able to handle even complicated objects, exhibiting strong specularities. We show that, combined with an iterated bundle adjustment, these improvements increase the accuracy of the obtained point cloud. © 2011 IEEE.

关键词： Optical resolving power

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BAT - A distributed meta-tracking system

BAT - A distributed meta-tracking system

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14th Eurographics Symposium on Virtual Environments, EGVE 2008

作者： Kahlesz, Ferenc Klein, Reinhard Computer Graphics Group Institute of Computer Science II University of Bonn Germany

ISBN: (纸本)9783905674064

This paper describes the design of the 'BAT' (Bonn Articulated Tracker) visual tracking framework. This system allows the easy implementation of real-time, multi-camera motion tracking that can be distributed (also in multithreaded sense) across several computing nodes (or CPU cores). The system in itself does not realize any specific tracking system, but manages a meta-algorithm flow between processing blocks. An actual tracking implementation is realized by specifying the processing blocks through plugins. Depending on the plugins supplied, 'BAT' is capable to instantiate a wide-variety of systems ranging from object-detection methods to model-based deformable object tracking based on time-coherence, allowing also for hybrid algorithms. Being a "meta dataflow system", 'BAT' also naturally facilitates sensor fusion. Moreover, it can be used as a testbed to compare and evaluate different kind of tracking algorithms or algorithm substeps. © The Eurographics Association 2008.

关键词： Object detection

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Removing fences from sweep motion videos using global 3D reconstruction and fence-aware light field rendering

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Computational Visual Media 2019年第1期5卷 21-32页

作者： Chanya Lueangwattana Shohei Mori Hideo Saito Department of Science and Technology Keio University Institute of Computer Graphics and Vision Graz University of Technology

Diminishing the appearance of a fence in an image is a challenging research area due to the characteristics of fences(thinness, lack of texture, etc.) and the need for occluded background restoration. In this paper, we describe a fence removal method for an image sequence captured by a user making a sweep motion, in which occluded background is potentially observed. To make use of geometric and appearance information such as consecutive images, we use two well-known approaches: structure from motion and light field rendering. Results using real image sequences show that our method can stably segment fences and preserve background details for various fence and background combinations. A new video without the fence, with frame coherence, can be successfully provided.

关键词： video fence video repair diminished reality(DR) structure from motion(SfM) light field rendering(LFR)

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Comparison of SVM and Random Forest for Detection of Malicious Node in Wireless Sensor Networks

Comparison of SVM and Random Forest for Detection of Malicio...

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Machine Learning and Autonomous Systems (ICMLAS), International Conference on

作者： Sankara Reddy Thamma E. Gurumoorthi C.Om Prakash S K Muthusundar M.S. Nidhya Balajee Maram Deloitte Consulting LLP USA Information Technology DC Technical Delivery Master II Concord North Carolina USA School of Engineering Malla Reddy University CMR University Bengaluru Dept of AI & DS Chennai Institute of Technology college Chennai School of Computer Applications Dayananda Sagar University Bangalore School of Computer Science and Artificial Intelligence SR University Ananthasagar Hasanparthy Warangal

ISBN: (数字)9798331505745

ISBN: (纸本)9798331505752

Wireless Sensor Networks (WSNs) are used in various contexts and offer a wide range of applications, despite being a decentralized, resource-scarce network type; this is why this study deals with the problem of malicious nodes. Identifying such nodes is important to preventing the compromise of the network and all the nodes in it. In this paper, a comparative study of two popular classifiers named Support Vector Machine (SVM) and Random Forest (RF) in order to detect hostile nodes in WSNs. By nature, a malicious node in a network will cause significant problems to the users. There are number of models also there to detect the malicious node. Based on the above-discussed parameters the paper compares these algorithms in terms of detection accuracy, computational complexity, scalability and performance measure of imbalanced data. The comparison draws on different targets such as accuracy, capacity/large scale, speed, and small sample imbalance, and noise. As stated in this paper, both SVM and Random Forest have its own strengths where the selection between them mainly depends on the network environment and the features of the malicious activity.

关键词： Support vector machines Radio frequency Wireless sensor networks Accuracy Noise Network security Feature extraction Real-time systems Random forests Tuning

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Image-Based Registration of 3D-Range Data Using Feature Surface Elements

Image-Based Registration of 3D-Range Data Using Feature Surf...

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5th International Symposium on Virtual Reality, Archaeology and Intelligent Cultural Heritage, VAST 2004

作者： Bendels, Gerhard Heinrich Degener, Patrick Wahl, Roland Körtgen, Marcel Klein, Reinhard Institute for Computer Science II Computer Graphics University of Bonn Germany

ISBN: (纸本)3905673185

Digitizing real-life objects via range scanners, stereo vision or tactile sensors usually requires the composition of multiple range images. In this paper we exploit intensity images often recorded with the range data and propose a fully automatic registration technique using 2D-image features with intrinsic scale information for finding corresponding points on the 3D-views. In our approach, the fine registration of two range images is performed by first aligning the feature points themselves, followed by a so-called constrained-domain alignment step. In the latter, rather than feature points, we consider feature surface elements that are derived using the scale information inherently established with the 2D-features. The global registration error is minimized using graph relaxation techniques to mediate the transformations required to align the multiple range images. We demonstrate the power and feasibility of our method by a case-study in the cultural heritage domain. © The Eurographics Association 2004.

关键词： Stereo image processing

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A TWO-SIZE WRIGHT-FISHER MODEL: ASYMPTOTIC ANALYSIS VIA UNIFORM RENEWAL THEORY

arXiv

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arXiv 2025年

作者： Alsmeyer, Gerold Cordero, Fernando Dopmeyer, Hannah Institute for Mathematical Stochastics Department of Mathematics and Computer Science University of Münster Orleans-Ring 10 Münster48149 Germany Institute of Mathematics BOKU University Gregor-Mendel-Straße 33/II Vienna1180 Austria Faculty of Technology Bielefeld University Box 100131 Bielefeld33501 Germany

MSC Codes Primary: 60K05, 92D25, Secondary: 60K10, 60K35, 60J70We consider a population with two types of individuals, distinguished by the resources required for reproduction: type-0 (small) individuals need a fractional resource unit of size ϑ ∈ (0, 1), while type-1 (large) individuals require 1 unit. The total available resource per generation is R. To form a new generation, individuals are sampled one by one, and if enough resources remain, they reproduce, adding their offspring to the next generation. The probability of sampling an individual whose offspring is small is ρR(x), where x is the proportion of small individuals in the current generation. This discrete-time stochastic model is called the two-size Wright-Fisher model, where the function ρR can represent mutation and/or frequency-dependent selection. We show that on the evolutionary time scale, i.e. accelerating time by a factor R, the frequency process of type-0 individuals converges to the solution of a Wright-Fisher-type SDE. The drift term of that SDE accounts for the bias introduced by the function ρR and the consumption strategy, the latter also inducing an additional multiplicative factor in the diffusion term. To prove this, the dynamics within each generation are viewed as a renewal process, with the population size corresponding to the first passage time τ(R) above level R. The proof relies on methods from renewal theory, in particular a uniform version of Blackwell’s renewal theorem for binary, non-arithmetic random variables, established via Ε-coupling. Copyright © 2025, The Authors. All rights reserved.

关键词： Stochastic systems

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Real-time appearance preserving out-of-core rendering with shadows

Real-time appearance preserving out-of-core rendering with s...

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15th Eurographics Workshop on Rendering Techniques, EGSR 2004

作者： Guthe, Michael Borodin, Pavel Balázs, Ákos Klein, Reinhard Institute of Computer Science II Computer Graphics Group University of Bonn Germany

ISBN: (纸本)3905673126

Despite recent advances in finding efficient LOD-representations for gigantic 3D objects, rendering of complex, gigabyte-sized models and environments is still a challenging task, especially under real-time constraints and high demands on the visual accuracy. The two general approaches are using either a polygon- or a point-based representation for the simplified geometry. With the polygon-based approaches high frame rates can be achieved by sacrificing the exact appearance and thus the image quality. Point-based approaches on the other hand preserve higher image quality at the cost of higher primitive counts and therefore lower frame rates. In this paper we present a new hybrid point-polygon LOD algorithm for real-time rendering of complex models and environments including shadows. While rendering different LODs, we preserve the appearance of an object by using a novel error measure for simplification which allows us to steer the LOD generation in such a way that the geometric as well as the appearance deviation is bounded in image space. Additionally, to enhance the perception of the models shadows should be used. We present a novel LOD selection and prefetching method for real-time rendering of hard shadows. In contrast to the only currently available method for out-of-core shadow generation, our approach entirely runs on a single CPU system. © The Eurographics Association 2004.

关键词： Image quality

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Free-Form Deformation with Rational DMS-Spline Volumes

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Journal of computer science & Technology 2008年第5期23卷 862-873页

作者：徐岗汪国昭陈小雕 Institute of Computer Graphics and Image Processing Zhejiang University Department of Mathematics Zhejiang University College of Computer Science Hangzhou Dianzi University INRIA Nancy France

In this paper, we propose a novel free-form deformation （FFD） technique, RDMS-FFD （Rational DMS-FFD）, based on rational DMS-spline volumes. RDMS-FFD inherits some good properties of rational DMS-spline volumes and combines more deformation techniques than previous FFD methods in a consistent framework, such as local deformation, control lattice of arbitrary topology, smooth deformation, multiresolution deformation and direct manipulation of deformation. We first introduce the rational DMS-spline volume by directly generalizing the previous results related to DMS-splines. How to generate a tetrahedral domain that approximates the shape of the object to be deformed is also introduced in this paper. Unlike the traditional FFD techniques, we manipulate the vertices of the tetrahedral domain to achieve deformation results. Our system demonstrates that RDMS-FFD is powerful and intuitive in geometric modeling.

关键词： free-form deformation rational DMS-spline volume control lattice of arbitrary topology multiresolution deformation direct manipulation

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