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Workshop on Digital Media and Digital Content Management (DMDCM)

作者： Ismahafezi Ismail Mohd Shahrizal Sunar Mohd Kufaisal Mohd Sidik Cik Suhaimi Yusof ViCube Laboratory Department of Computer Graphics and Multimedia Faculty of Computer Science and Information System Universiti Teknologi Malaysia Johor Malaysia

This paper presents a current motion research in the real time animation character. Real time animation character has the problem with unrealistic and unnatural character movement. This review focuses on three main parts in dynamic motion generation with physics consideration and control: skeleton hierarchy and kinematics, motion capture data animation, and active dynamic control.

关键词： Dynamics Animation Kinematics Real time systems Joints Humans

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SALSA and ALVIS: a language and system for constructing and presenting low fidelity algorithm visualizations

SALSA and ALVIS: a language and system for constructing and ...

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IEEE Symposium on Visual Languages

作者： C. Hundhausen S. Douglas Laboratory for Interactive Learning Technologies Department of Information and Computer Sciences University of Hawai Honolulu HI USA Human-Computer Interaction Laboratory Department of Computer and Information Science University of Oregon Eugene OR USA

computer science educators have traditionally used algorithm visualization (AV) software to create graphical representations of algorithms that are later used as visual aids in lectures, or as the basis for interactive labs. Based on ethnographic field studies we have conducted in an undergraduate algorithms course, we advocate an alternative teaching approach in which students use simple art supplies to construct and present their own visualizations to their peers and instructor for feedback and discussion. To support this approach, we have built SALSA and ALVIS, a prototype language and system that enable students to (a) quickly construct rough, unpolished ("low fidelity") visualizations in much the same way they would do so with simple art supplies, and (b) interactively present those visualizations to an audience. Our prototype pioneers a novel technique for programming visualizations based on spatial relations, and a novel presentation interface that supports reverse execution and dynamic mark-up and modification.

关键词： Visualization Art Prototypes Laboratories computer science Education Feedback Animation Algorithm design and analysis Space exploration

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Communicative dimensions of end-user environments

Communicative dimensions of end-user environments

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IEEE Symposium on Human Centric Computing Languages and Environments

作者： C.D. Hundhausen S.A. Douglas Laboratory for Interactive Learning Technologies Department of Information and Computer Sciences University of Hawai Honolulu HI USA Human-Computer Interaction Laboratory Department of Computer and Information Science University of Oregon Eugene OR USA

ISBN: (纸本)0780371984

In exploring how to make programming easier for non-programmers, research into end-user environments has traditionally been concerned with designing better human-computer interaction. That traditional focus has left open the question of how end-user environments might support human-human interaction. Especially in situations in which end-user environments are enlisted to facilitate learning, we hypothesize that a key benefit may be their ability to mediate conversations about a domain of interest. In what ways might end-user environments support human communication, and what design features make them well-suited to do so? Drawing on ethnographic studies of an undergraduate algorithms course in which students constructed and presented algorithm visualizations, we develop a provisional framework of six communicative dimensions of end-user environments: programming salience, typeset fidelity, story content, modifiability, controllability and referencability. To illustrate the design implications of these dimensions, we juxtapose conventional algorithm visualization technology with a prototype end-user environment specifically designed to facilitate communication about algorithms. By characterizing those aspects of end -user environments that impact social interaction, our framework provides an important extension to T.R.G. Green and M. Petre's (1996) cognitive dimensions.

关键词： Visualization Humans Algorithm design and analysis Programming profession Physics Typesetting Controllability Social implications of technology Prototypes Graphical user interfaces

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A Multi-Level Thresholding Image Segmentation Based on an Improved Artificial Bee Colony Algorithm 2nd

A Multi-Level Thresholding Image Segmentation Based on an Im...

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2nd EAI International Conference on Robotic Sensor Networks, ROSENET 2018

作者： Xia, Xingyu Gao, Hao Hu, Haidong Lan, Rushi Pun, Chi-Man The Institute of Advanced Technology Nanjing University of Posts and Telecommunications Nanjing China Department of Computer and Information Science University of Macau China Beijing Institute of Control Engineering Beijing China Key Laboratory of Intelligent Processing of Computer Image and Graphics Guilin University of Electronic Technology Guilin China

ISBN: (纸本)9783030177621

As a popular evolutionary algorithm, artificial bee colony (ABC) algorithm has been successfully applied into the threshold-based image segmentation problem. Based on our analysis, we find that the Otsu segmentation function is separable which means each variable is independent. Due to its one-dimensional search strategy and relative power global but poorer local search abilities, ABC could find an acceptable but not precise segmentation results. For making more precise search and further enhancing the achievements on image segmentation, we propose an Otsu segmentation method based on a new ABC algorithm with an improved scout bee strategy. Different from the traditional scout bee strategy, we use a local search strategy when a bee stagnates for a defined value. The experimental results on Berkeley segmentation database demonstrate the effectiveness of our algorithm. © 2020, Springer science and Business Media Deutschland GmbH. All rights reserved.

关键词： Image segmentation

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New Silhouette Detection Algorithm to Create Real-Time Volume Shadow

New Silhouette Detection Algorithm to Create Real-Time Volum...

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Workshop on Digital Media and Digital Content Management (DMDCM)

作者： Hoshang Kolivand Mohd Shahrizal bin Sunar UTM ViCube Laboratory Department of Computer Graphics and Multimedia Faculty of Computer Science and Information System Universiti Teknologi Malaysia Johor Malaysia

In this paper a new algorithm to recognize occluder silhouette for generating shadow volume with some improvement of the traditional shadow volume algorithm is proposed. Silhouette detection is one of the expensive processes of volume shadows (VS). The triangular algorithm and visible-non-visible algorithm that are famous algorithms to detect the outline of occluder are renewed. An accurate comparison between these algorithms and a new algorithm has been done. The algorithm involves to detect silhouette and decreases the cost of implementation of VS. The obtained results confirm superiority of the proposed algorithm in terms of processing time to the previously used traditional algorithms. The last volume shadow algorithm using stencil buffer is rewritten and an algorithm for VS with silhouette detection together is proposed. It makes higher the number of frame per second.

关键词： Face Image edge detection Light sources Real time systems Arrays Rendering (computer graphics)

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Virtual hand interactions with 3D world 4

Virtual hand interactions with 3D world

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4th International Conference on Multi-Media Modeling, MMM 1997

作者： Moccozet, L. Huang, Z. Magnenat Thalmann, N. Thalmann, D. MIRALab-CUI University of Geneva 24 Rue Géńral Dufour Geneva 4CH 1211 Switzerland Computer Graphics Laboratory Swiss Federal Institute of Technology LausanneCH 1015 Switzerland Department of Information Systems and Computer Science National University of Singapore Singapore119260 Singapore

ISBN: (纸本)9810233515

Interactions between a virtual actor and its virtual environment involve many aspects. An important one is hands interactions. In a virtual scene depicting everyday life, the actor will need to grasp and hold objects, in such a way that both skeleton motion and body deformation have a realistic visual aspect. It will also need to interact with other virtual actors sharing the same virtual world, shaking hands when meeting for example. We present an efficient and realistic method combining automatic hand motion generation with hand deformation simulation. The resulting system is integrated in an interactive human simulation application. It adds the ability to simulate hand interactions between actors and their environment, in combination with traditional human animation techniques. The skeleton is animated by a heuristic motion control and multi-sensor based technique. The final free-form surface hand model is produced by a three-layer deformation model. The intermediate muscular layer is based on a geometric deformation tool, where deformations are coasidered as interpolating control points displacements. © Multimedia Modeling, MMM 1997 - Modeling Multimedia information and Systems. All rights reserved.

关键词： Deformation

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Anisotropic range image integration

Anisotropic range image integration

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Joint 34th Symposium of the German Association for Pattern Recognition, DAGM 2012 and 36th Symposium of the Austrian Association for Pattern Recognition, OAGM 2012

作者： Schroers, Christopher Zimmer, Henning Valgaerts, Levi Bruhn, Andrés Demetz, Oliver Weickert, Joachim Mathematical Image Analysis Group Faculty of Mathematics and Computer Science Saarland University Saarbrücken 66041 Germany Computer Graphics Laboratory Department of Computer Science ETH Zurich Zurich 8092 Switzerland Max-Planck-Institut für Informatik Campus E1.4 Saarbrücken 66123 Germany Institute for Visualization and Interactive Systems University of Stuttgart Universitätsstraße 38 70569 Stuttgart Germany

ISBN: (纸本)9783642327162

Obtaining high-quality 3D models of real world objects is an important task in computer vision. A very promising approach to achieve this is given by variational range image integration methods: They are able to deal with a substantial amount of noise and outliers, while regularising and thus creating smooth surfaces at the same time. Our paper extends the state-of-the-art approach of Zach et al.(2007) in several ways: (i) We replace the isotropic space-variant smoothing behaviour by an anisotropic (direction-dependent) one. Due to the directional adaptation, a better control of the smoothing with respect to the local structure of the signed distance field can be achieved. (ii) In order to keep data and smoothness term in balance, a normalisation factor is introduced. As a result, oversmoothing of locations that are seen seldom is prevented. This allows high quality reconstructions in uncontrolled capture setups, where the camera positions are unevenly distributed around an object. (iii) Finally, we use the more accurate closest signed distances instead of directional signed distances when converting range images into 3D signed distance fields. Experiments demonstrate that each of our three contributions leads to clearly visible improvements in the reconstruction quality. © 2012 Springer-Verlag.

关键词： computer vision

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Towards outcome based learning: An engineering education case

Towards outcome based learning: An engineering education cas...

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2011 IEEE Global Engineering Education Conference, EDUCON 2011

作者： Najjar, Jad Klobučar, Tomaž Nguyen-Ngoc, Anh Vu Totschnig, Michael Müller, Franz Simon, Bernd Karlsson, Mikael Eriksson, Henning Institute for Information Systems and New Media WU Vienna of Economics and Business Vienna Austria Laboratory for Open Systems and Networks Jozef Stefan Institute Ljubljana Slovenia Department of Computer Science University of Leicester Leicester United Kingdom Dept. of Interactive Media and Learning Umeå University Umeå Sweden Department of Computer Science AL-Quds University Jerusalem Palestine

ISBN: (纸本)9781612846439

Following the European initiatives like European Qualification Framework (EQF), Europass [4] and European Learner Mobility [3], the aim of this paper is to introduce specifications, services and applications that enable the management and use of learning outcome information. We present pilot implementation and validation of the adoption of standards and specifications related to outcome based learning. Prototypes are developed as widgets and modules of Learning Management Systems (LMS) like Moodle, to produce and import data about intended learning outcomes of learning opportunities and achieved learning outcomes of learners. We demonstrate an outcome based Engineering Education use case. © 2011 IEEE.

关键词： Engineering education

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On the translation-invariance of image distance metric

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Applied Informatics 2015年第1期2卷 1-12页

作者： Bing Sun Jufu Feng Guoping Wang Key Laboratory of Machine Perception (Ministry of Education) Department of Machine Intelligence School of Electronics Engineering and Computer Science Peking University Beijing People’s Republic of China Graphics and Interactive Laboratory School of Electronics Engineering and Computer Science Peking University Beijing People’s Republic of China

An appropriate choice of the distance metric is a fundamental problem in pattern recognition, machine learning and cluster analysis. Some methods that based on the distance of samples, e.g, the k-means clustering algorithm and the k-nearest neighbor classifier, are crucially relied on the performance of the distance metric. In this paper, the property of translation invariance for the distance metric of images is especially emphasized. The consideration is twofold. Firstly, some of the commonly used distance metrics, such as the Euclidean and Minkowski distance, are independent of the training set and/or the domain-specific knowledge. Secondly, the translation invariance is a necessary property for any intuitively reasonable image metric. The image Euclidean distance (IMED) and generalized Euclidean distance (GED) are image metrics that take the spatial relationship between pixels into consideration. Sun et al.(IEEE Conference on computer Vision and Pattern Recognition, pp 1398–1405, 2009) showed that IMED is equivalent to a translation-invariant transform and proposed a metric learning algorithm based on the equivalency. In this paper, we provide a complete treatment on this topic and extend the equivalency to the discrete frequency domain. Based on the connection, we show that GED and IMED can be implemented as low-pass filters, which reduce the space and time complexities significantly. The transform domain metric learning proposed in (Sun et al. 2009) is also resembled as a translation-invariant counterpart of LDA. Experimental results demonstrate improvements in algorithm efficiency and performance boosts on the small sample size problems.

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Using visualizations to learn algorithms: should students construct their own, or view an expert's?

Using visualizations to learn algorithms: should students co...

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IEEE Symposium on Visual Languages

作者： C. Hundhausen S. Douglas Laboratory for Interactive Learning Technologies Informatiuon and interactive learning Deppartment University of Hawai Honolulu HI USA Computer and Information Science Department University of Oregon Eugene OR USA

Algorithm visualization software graphically illustrates how computer algorithms work. Past experiments designed to substantiate the software's pedagogical value have yielded mixed results. A review of these studies suggests that the more actively involved learners are in the visualization process, the better they perform. Given this trend, and inspired by ethnographic fieldwork we conducted in an undergraduate algorithms course, we hypothesize that students who use simple art supplies to construct their own visualizations will learn an algorithm better than students who interact with computer based visualizations constructed by an expert. We conducted an experiment to test this hypothesis, and found no significant differences between the two pedagogical approaches. Thus, students who use "low tech" materials to construct their own visualizations may learn algorithms just as well as students who study conventional "high tech" visualizations constructed by an expert. This result motivates a markedly different kind of algorithm visualization software: one that enables learners to construct their own "low tech" visualizations.

关键词： Visualization Animation Software algorithms Art Laboratories Testing Conducting materials information science information analysis Concrete

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