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International Journal of Multimedia and Ubiquitous Engineering 2012年第2期7卷 359-363页

作者： Talha, Muhammad Sulong, Ghazali Bin Alarifi, Abdulrahman College of Science Research Centre King Saud University Riyadh Saudi Arabia Department of Computer Graphics and Multimedia Faculty of Computer Science and Information System Universiti Teknologi Malaysia Malaysia Computer Research Institute King Abdulaziz City for Science and Technology Riyadh Saudi Arabia

In this paper, we have proposed a method that consists of combination of different methods. First we have performed enhancement on breast mammogram to enhance the image quality. After that discrete cosine transform has been applied for features extraction. Bayesian Classifier has been used for classification into benign and malignant. It has been noted that results are very much satisfactory. We have used MIAS data set for experimentation purpose. Proposed method performs good when we have tested on different images.

关键词： Discrete cosine transforms

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Collaborative Factory Planning in Virtual Reality

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Procedia CIRP 2012年 3卷 317-322页

作者： N. Menck X. Yang C. Weidig P. Winkes C. Lauer H. Hagen B. Hamann J.C. Aurich Institute for Manufacturing Technology and Production Systems (FBK) 67653 Kaiserslautern Germany Computer Graphics and HCI Group 67653 Kaiserslautern Germany Institute for Data Analysis and Visualization (IDAV) Davis 95616-8562 USA

The competitive development and optimization of manufacturing systems challenge the collaboration and innovation of enterprises. Different information, thinking, and points of view have to be exchanged across engineering, decision-making, and executive levels safely and effectively. The Virtual Reality (VR) technologies provide the users advanced Human-computer-Interfaces for designing, analyzing, and optimizing complex manufacturing systems. The objective of this paper is to describe a VR-based approach that allows the simultaneous visualization, investigation, and analysis for factory planning. This gives global entities a competitive advantage when conducting business.

关键词： Distance Collaboration Factory Planning Virtual Reality

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Semantic Crowds: Reusable Population for Virtual Worlds

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Procedia computer Science 2012年 15卷 122-139页

作者： Nick Kraayenbrink Jassin Kessing Tim Tutenel Gerwin de Haan Fernando Marson Soraia R Musse Rafael Bidarra Computer Graphics and Visualisation Group Delft University of Technology Delft The Netherlands Virtual Humans Simulation Lab Pontifícia Universidade Católica do Rio Grande do Sul Porto Alegre Brazil

Recent advances in crowd simulation techniques have led to realistic agent and group behavior through elaborate behavioral models, complex motion planning algorithms and impressive physics systems. As many crowd simulation solutions typically target only specific types of environment and scenario, a variety of special-purpose methods and systems has emerged that are hard to re-configure and re-use in other contexts. Solving this situation demands a higher-level approach that takes re-use and configuration of crowds as a priority, for adequate application in a broad variety of scenarios, virtual environments and inter- action with the entities present in that environment. In this article we propose semantic crowds , a novel approach that allows one to re-use the same crowds for virtually any environment, and have them use the objects available in it in a meaningful manner, without any modification. To have the agents autonomously interact within any virtual world, we minimize in them the information relative to what objects do and how to use them. Instead, that information is stored in the objects themselves, which the agents can then query, based on what they plausibly want to achieve. To facilitate creating such crowds, we devel- oped an interactive crowd editor that provides high-level editing parameters for defining crowd templates. We illustrate the flexibility of semantic crowds by means of two cases, in which we let the same crowd populate quite differently configured airport terminal environments. These examples also highlight that this modular approach easily combines with your custom implementations of agent behavior model and/or motion planner.

关键词： Crowd specification Reusable crowds Semantic virtual worlds

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Reciprocal shading for mixed reality

Reciprocal shading for mixed reality

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作者： Knecht, Martin Traxler, Christoph Mattausch, Oliver Wimmer, Michael Vienna University of Technology Institute of Computer Graphics and Algorithms Favoritenstrasse 9-11 A-1040 Vienna Austria VRVis Zentrum für Virtual Reality Visualisierung Forschungs-GmbH Donau-City-Strasse 1 A-1220 Vienna Austria University of Zurich Department of Informatics Binzmuehlestrasse 14 CH-8050 Zurich Switzerland

In this paper we present a novel plausible rendering method for mixed reality systems, which is useful for many real-life application scenarios, like architecture, product visualization or edutainment. To allow virtual objects to seamlessly blend into the real environment, the real lighting conditions and the mutual illumination effects between real and virtual objects must be considered, while maintaining interactive frame rates. The most important such effects are indirect illumination and shadows cast between real and virtual objects. Our approach combines Instant Radiosity and Differential Rendering. In contrast to some previous solutions, we only need to render the scene once in order to find the mutual effects of virtual and real scenes. In addition, we avoid artifacts like double shadows or inconsistent color bleeding which appear in previous work. The dynamic real illumination is derived from the image stream of a fish-eye lens camera. The scene gets illuminated by virtual point lights, which use imperfect shadow maps to calculate visibility. A sufficiently fast scene reconstruction is done at run-time with Microsofts Kinect sensor. Thus, a time-consuming manual pre-modeling step of the real scene is not necessary. Our results show that the presented method highly improves the illusion in mixed-reality applications and significantly diminishes the artificial look of virtual objects superimposed onto real scenes. © 2012 Elsevier Ltd.

关键词： Mixed reality

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Structured Local Predictors for image labelling

Structured Local Predictors for image labelling

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Conference on computer Vision and Pattern Recognition (CVPR)

作者： Samuel Rota Buló Peter Kontschieder Marcello Pelillo Horst Bischof Dipartimento di Scienze Ambientali Informatica e Statistica Università Ca Foscari di Venezia Italy Institute for Computer Graphics and Vision Graz University of Technology Austria

In this paper we introduce Structured Local Predictors (SLP) - A new formulation that considers the image labelling problem from a structured learning point of view. SLP are locally operating models, which provide a per-pixel labelling by exploiting contextual relations, learned from complex interactions between labels and a customizable intermediate representation of the image data. Our first key contribution is to handle flexible configurations of pairwise interactions between image pixels while allowing them to be made arbitrarily dependent on the image data. Moreover, we pose the parameter learning process as a convex, structured-learning problem, which can be efficiently solved in a globally optimal way due to the introduction of a continuous, structured output space. Finally, we provide an interface to our model by means of a quantization space, allowing to define task-specific intermediate representations for the input data. In our experiments we demonstrate the broad applicability of our model for tasks like inpainting and semantic labelling.

关键词： Quantization Labeling Computational modeling Training Decision trees Data models computer vision

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Title of tutorial: Designing immersive VR systems: From bits to bolts

Title of tutorial: Designing immersive VR systems: From bits...

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IEEE Annual International Symposium Virtual Reality

作者： Luciano P. Soares Joaquim A. Jorge José Miguel Salles Dias Alberto Raposo Bruno R. de Araújo Leonel Valbom Filipe Gaspar Tecgraf - Computer Graphics Technology Group Pontifical Catholic University of Rio de Janeiro Instituto Superior Técnico ISCTE IUL MLDC - Microsoft Language Development Center Escola Superior Gallaecia

Immersive 3D Virtual Environments (VE) have become affordable for many research centers. However, a complete solution needs several integration steps to be fully operational. Some of these steps are difficult to accomplish and require an uncommon combination of different skills. This tutorial presents the most recent techniques developed to address this problem, from displays to software tools. The hardware in a typical VR installations combines projectors, screens, speakers, computers, tracking and I/O devices. The tutorial will discuss hardware options, explaining their advantages and disadvantages. We will cover design decisions from basic software and hardware design, through user tracking, multimodal human-computer interfaces and acoustic rendering, to how to administrate the whole solution. Additionally, we will provide an introduction to existing tracking technologies, explaining how the most common devices work, while focusing on infrared optical tracking. Finally, we briefly cover integration software and middleware developed for most VE settings.

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A Supervised ANN Method for Memory Failure signature Classification

A Supervised ANN Method for Memory Failure signature Classif...

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2012 IEEE 11th International Conference on Solid-State and Integrated Circuit technology(ICSICT-2012)

作者： Jianbo Li Yu Huang Wu-Tung Cheng Chris Schuermyer Dong Xiang Department of Computer Science and Technology Mentor Graphics Corporation School of Software Tsinghua University

ISBN: (纸本)9781467324748

Failure bitmaps of manufactured memory arrays may contain the information associated to some systematic defects and have hence been used to monitor the process and improve the memory *** is very important to develop a method to extract and classify the fault signatures in the failure *** fault signatures can be classified into two categories:local fault signatures and global fault *** on the local fault signatures,this paper introduces a supervised one-layer ANN method to solve the signature classification *** method is efficient for recognizing the local fault signatures in the failure bitmaps,and more importantly,it has the ability to find new signatures unseen before.

关键词： red ANN A Supervised ANN Method for Memory Failure signature Classification

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A Hybrid Flow for Memory Failure Bitmap Classification

A Hybrid Flow for Memory Failure Bitmap Classification

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Asian Test Symposium (ATS)

作者： Jianbo Li Yu Huang Wu-Tung Cheng Chris Schuermyer Dong Xiang Eric Faehn Ruth Farrugia Department of Computer Science and Technology Tsinghua University Beijing China Mentor Graphics Corporation Wilsonville OR USA School of Software Tsinghua University Beijing China ST-Microelectronics Crolles France ST-Ericsson Grenoble France

Failure bitmaps of manufactured memory arrays may contain the information of some systematic defects and have hence been used to monitor the process and to improve the memory yield. It is important to have an accurate flow to classify the memory failure bitmap signatures. The memory bitmap signature classification can be either dictionary based or machine learning based. This paper introduces a hybrid flow that can combine dictionary based and machine learning based methods. The proposed method can enhance the accuracy of signature classification, and more importantly, it has the capability of learning new memory bitmap signatures unseen before.

关键词： Artificial neural networks Shape Vectors Dictionaries Neurons Training Support vector machine classification

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Branch-and-Cut-and-Price for Capacitated Connected Facility Location

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Journal of Mathematical Modelling and Algorithms 2011年第3期10卷 245-267页

作者： Leitner, Markus Raidl, Günther R. Institute of Computer Graphics and Algorithms Vienna University of Technology Vienna Austria

We consider a generalization of the Connected Facility Location Problem (ConFL), suitable to model real world network extension scenarios such as fiber-to-the-curb. In addition to choosing a set of facilities and connecting them by a Steiner tree as in ConFL, we aim to maximize the resulting profit by potentially supplying only a subset of all customers. Furthermore, capacity constraints on potential facilities need to be considered. We present two mixed integer programming based approaches which are solved using branch-and-cut and branch-and-cut-and-price, respectively. By studying the corresponding polyhedra we analyze both approaches theoretically and show their advantages over previously presented models. Furthermore, using a computational study we are able to additionally show significant advantages of our models over previously presented ones from a practical point of view. © 2011 Springer Science+Business Media B.V.

关键词： Branch-and-cut Branch-and-cut-and-price Connected facility location Mixed integer programming Network design

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Screen-space bias compensation for interactive high-quality global illumination with virtual point lights 11

Screen-space bias compensation for interactive high-quality ...

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Symposium on Interactive 3D graphics and Games

作者： Novák, Jan Engelhardt, Thomas Dachsbacher, Carsten Computer Graphics Group Karlsruhe Institute of Technology Germany

ISBN: (纸本)9781450305655

In this paper we present a method that targets high-quality global illumination at interactive frame rates. As many techniques in this context, our method is based on instant radiosity, which represents the indirect illumination in a scene with a set of virtual point lights, and therefore enables efficient GPU rendering. Instant radiosity captures light transport over larger distances well, but it requires clamping of the point lights' contribution to avoid bright splotches on nearby surfaces. By bounding the short distance light transport, the algorithm removes some energy and thus introduces bias, that is visible as incorrect darkening near edges and corners. Our method improves the quality and correctness of the rendered images by removing bias using a hierarchical screen space approach. We show that the bias compensation can be formulated as a post-processing step and demonstrate renderings comparable to results from offline algorithms at interactive speed. Copyright © 2011 by the Association for Computing Machinery, Inc.

关键词： Image enhancement

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