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Global Contrast Factor - a New Approach to Image Contrast

Global Contrast Factor - a New Approach to Image Contrast

引用

1st Eurographics Workshop on Computational Aesthetics in graphics, Visualization, and Imaging, CAe 2005

作者： Matković, Krešimir Neumann, László Neumann, Attila Psik, Thomas Purgathofer, Werner VRVis Research Center Vienna Austria University of Girona ICREA Barcelona Spain Institute of Computer Graphics and Algorithms Vienna University of Technology Austria Institute for Design and Assessment of Technology Vienna University of Technology Austria

ISBN: (纸本)3905673274

Contrast in image processing is usually defined as a ratio between the darkest and the brightest spots of an image. In this paper we introduce a different contrast definition. The newly introduced Global Contrast Factor (GCF) corresponds closer to the human perception of contrast. GCF uses contrasts at various resolution levels in order to compute overall contrast. Experiments were conducted in order to find weight factors needed to calculate GCF. GCF measures richness of detail as perceived by a human observer, and as such can be used in various application areas like rendering, tone mapping, volume visualization, and lighting design. © The Eurographics Association 2005.

关键词： Image processing

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An assessment of graphics faculty and student learning styles

An assessment of graphics faculty and student learning style...

引用

2005 ASEE Annual Conference and Exposition: The Changing Landscape of Engineering and technology Education in a Global World

作者： Sadowski, Mary A. Birchman, Judith A. Harris, La Verne Abe School of Technology Purdue University West Lafayette IN 47907 United States Computer Graphics Technology Purdue University West Lafayette IN 47907 United States Information and Management Technology Arizona State University Mesa AZ 85212 United States

It is generally accepted that the ability to visualize is an important tool for engineers and technologists especially in Engineering graphics. Enhancing the spatial visualization abilities of engineering students has long been a focus of engineering graphics educators. A variety of tests and procedures to determine learning styles have been developed and used over the years. As professors, we tend to teach the way we learn, whether that is good for the students or not. Understanding our own learning style as well as the styles of our students might help us become better communicators. There are a wide variety of tests and indicators for determining learning styles. Kolb (2001), Herrmann (1995), and others have similar but different theories on learning styles. Most of us are familiar with the Myers Briggs Type Indicator tests (MBTI) given to high school students to help them make educated decisions about their career choices. A search on the web will turn up numerous sites and on-line tests. Traditionally, instructors have encouraged to present information in several different modes to engage students with a variety of learning styles. This paper presents the results of a pilot study that examined the learning styles of graphic educators and graphics students using the Style Delineator by Anthony Gregore (2000). The Style Delineator is a self-assessment instrument for adults and can be used as a tool for understanding learning as well as teaching styles. For the purpose of this pilot study, the student participants were limited to undergraduates majoring in computer graphics technology. The faculty participants were university graphics instructors with a variety of academic and industrial backgrounds.

关键词： computer graphics

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A novel performance evaluation method of local detectors on non-planar scenes

A novel performance evaluation method of local detectors on ...

引用

IEEE computer Society Conference on computer Vision and Pattern Recognition Workshops (CVPRW)

作者： F. Fraundorfer H. Bischof Institute for Computer Graphics and Vision Graz University of Technology Graz Austria

This paper presents a new method for performance evaluation of local detectors on non-planar scenes. The framework extends the detector evaluation of Mikolajczyk and Schmid to non-planar scenes. The basic idea for establishing ground truth information on 3D scenes is the use of the trifocal tensor and the point transfer property. The repeatability and matching scores (using the SIFT descriptor) for the currently most popular local detectors are compared for increasing viewpoint change. In addition, detector combinations are evaluated by estimating the diversity of regions produced by the different detectors. The experiments reveal that the results differ from that of previous evaluations on planar scenes, especially that repeatability and matching scores will be much lower in real applications as suggested by previous evaluations.

关键词： Detectors Layout Geometry Testing Object detection computer graphics Tensile stress Image retrieval Indexing Object recognition

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VR - A reality check?

VR - A reality check?

引用

IEEE Virtual Reality 2005

作者： Smith, Randall C. Sandin, Dan Fisher, Brian D. Westin, Stephen H. General Motors R and D Electronic Visualization Lab. U. Illinois Chicago School of Interactive Arts and Technology Simon Fraser University Program of Computer Graphics Cornell University

Within the large spectrum of possible VR application areas, automotive applications were among the first to appear, and are among the most demanding. technology has not been sufficiently sophisticated for many tasks. The troubling thought is that we are happy to push the technology envelope, but don't really know how useful this technology is, or can be. Could I do my job even if I had a real-time, ortho-stereoscopic, head-tracked, multi-viewer, wide-field-of-view, high-dynamic-range display with eye-limiting acuity?

关键词： Virtual reality

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Profile flags: A novel metaphor for probing of T2 maps

Profile flags: A novel metaphor for probing of T2 maps

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VIS 05: IEEE Visualization 2005, Proceedings

作者： Mlejnek, Matej Ermes, Pierre Vilanova, Anna Van Rijt, Rob Der Van Bosch, Harrie Den Gerritsen, Frans Gröller, Meister Eduard Institute of Computer Graphics and Algorithms Vienna University of Technology Austria Philips Medical Systems Best Netherlands Department of Biomedical Engineering Technische Universiteit Eindhoven Netherlands Catharina Hospital Eindhoven Netherlands

ISBN: (纸本)0780394623

This paper describes a tool for the visualization of T2 maps of knee cartilage. Given the anatomical scan and the T2 map of the cartilage, we combine the information on the shape and the quality of the cartilage in a single image. The Profile Flag is an intuitive 3D glyph for probing and annotating of the underlying data. It comprises a bulletin board pin-like shape with a small flag on top of it. While moving the glyph along the reconstructed surface of an object, the curve data measured along the pin's needle and in its neighborhood are shown on the flag. The application area of the Profile Flag is manifold, enabling the visualization of profile data of dense but inhomogeneous objects. Furthermore, it extracts the essential part of the data without removing or even reducing the context information. By sticking Profile Flags into the investigated structure, one or more significant locations can be annotated by showing the local characteristics of the data at that locations. In this paper we are demonstrating the properties of the tool by visualizing T2 maps of knee cartilage. © 2005 IEEE.

关键词： Cartilage

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A closed-loop rate-based contention control for optical burst switched networks

A closed-loop rate-based contention control for optical burs...

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GLOBECOM'05: IEEE Global Telecommunications Conference, 2005

作者： Farahmand, Farid Zhang, Qiong Jue, Jason P. Department of Computer Electronics and Graphics Technology Central Connecticut State University New Britain CT 06050 Mathematical Sciences and Applied Computing Arizona State University West United States Department of Computer Science University of Texas at Dallas Richardson TX 75083

ISBN: (纸本)0780394143

In this paper we describe a rate-based OBS network architecture in which core switch nodes send explicit messages to edge nodes requesting them to reduce their transmission rate on congested links. Within this framework, we introduce a new contention avoidance mechanism called proportional control algorithm with explicit reduction request (PCwER). Through source rate control, PCwER proactively attempts to prevent the network from entering the congestion state. Basic building blocks and performance trade-offs of PCwER are the main focus of this paper. In addition, through a simple fluid model we analyze the characteristics of the algorithm. Our simulation results show that the proposed contention avoidance techniques improve the network utilization and reduce the packet loss probability.

关键词： Closed loop control systems

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A robust matching algorithm for active appearance models 1

引用

Workshops Bildverarbeitung fur die Medizin: Algorithmen - Systeme - Anwendungen, BVM 2005 - Workshop on Image Processing for Medicine: Algorithms - Systems - Applications, BVM 2005

作者： Beichel, Reinhard Bischof, Horst Langs, Georg Sonka, Milan Institute for Computer Graphics and Vision Graz University of Technology Inffeldgasse 16/2 A-8010 Graz Austria Pattern Recognition and Image Processing Group Vienna University of Technology Favoritenstr. 9 A-1040 Vienna Austria Department of Electrical and Computer Engineering University of Iowa Iowa City IA 52242 United States

ISBN: (数字)9783540264316

ISBN: (纸本)3540250522

This paper proposes a method for robustly matching active appearance models (AAMs) on images with gross disturbances (outliers). The method consists of two steps. First, an initial residual is calculated by comparing model and image appearance, and modes of the residual are analyzed. Second, all possible mode combinations are tested by evaluating an objective function. The objective function allows the selection of an outlier-free mode combination. Experiments demonstrate the ability of the robust matching method to successfully cope with outliers - compared to standard AAM matching, no degeneration of the model during matching occurs.

关键词： Statistics

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On-line Conservative Learning for Person Detection

On-line Conservative Learning for Person Detection

引用

Joint IEEE International Workshop on Visual Surveillance and Performance Evaluation of Tracking and Surveillance

作者： P.M. Roth H. Grabner H. Bischof D. Skocaj A. Leonardist Graz University of Technology Institute for Computer Graphics and Vision Austria Faculty of Computer and Information Science University of Ljubljana Slovenia

We present a novel on-line conservative learning framework for an object detection system. All algorithms operate in an on-line mode, in particular we also present a novel on-line AdaBoost method. The basic idea is to start with a very simple object detection system and to exploit a huge amount of unlabeled video data by being very conservative in selecting training examples. The key idea is to use reconstructive and discriminative classifiers in an iterative co-training fashion to arrive at increasingly better object detectors. We demonstrate the framework on a surveillance task where we learn person detectors that are tested on two surveillance video sequences. We start with a simple moving object classifier and proceed with incremental PCA (on shape and appearance) as a reconstructive classifier, which in turn generates a training set for a discriminative on-line AdaBoost classifier

关键词： Object detection Visual system Surveillance computer vision Robustness Detectors Layout computer science education Educational programs Educational technology

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MonkeyBridge: Autonomous agents in augmented reality games

MonkeyBridge: Autonomous agents in augmented reality games

引用

2005 ACM SIGCHI International Conference on Advances in computer Entertainment technology, ACE '05

作者： Barakonyi, István Weilguny, Markus Psik, Thomas Schmalstieg, Dieter Graz University of Technology Institute of Computer Graphics and Vision Inffeldgasse 16 Graz A-8010 Austria Hagenberg University of Applied Sciences Media Technology and Design Hauptstraße 117 Hagenberg A-4232 Austria Vienna University of Technology Institute of Design and Assesment of Technology Argentinierstr. 8/187 Vienna A-1040 Austria

ISBN: (纸本)1595931104

MonkeyBridge is a collaborative Augmented Reality (AR) game employing autonomous animated agents embodied by lifelike, animated virtual characters and "smart" physical objects. The game serves as a pilot application to examine how "smart" software and hardware components capable of observing and reacting to events in the physical and virtual world can be useful in AR applications. We describe the implementation details of our test setups as well as how autonomous agents offer a rich gaming experience in AR games.

关键词： Autonomous agents

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Assessing the assessments: Sometimes the results are surprising

Assessing the assessments: Sometimes the results are surpris...

引用

2005 ASEE Annual Conference and Exposition: The Changing Landscape of Engineering and technology Education in a Global World

作者： Colwell, Joy L. Whittington, Jana Higley, James Purdue University Calumet United States Department of Organizational Leadership and Supervision Purdue University Calumet Hammond IN United States Department of Computer Graphics Technology Purdue University Calumet United States Department of Mechanical Engineering Technology Purdue University Calumet United States

The Manufacturing Engineering Technologies and Supervision Department at Purdue University Calumet has been actively involved with course embedded assessment techniques for more than three years. The assessment project has spanned the engineering technologies programs, the computer graphics technology program, and the organizational leadership and supervision programs. During those three years, the faculty members have learned much about structuring course-embedded assessments and using those assessments for continuous improvement in support of program goals and ABET outcomes. This paper will outline the basic premises and methods of our assessments, then compare data from traditional and online courses, and discuss how "soft" skills such as teamwork, communication and peer review, and creative problem-solving can be assessed in both traditional and online courses. Specific data from engineering technology, computer graphics technology, and organizational leadership and supervision will be discussed, as well as statistical data comparing results from online courses and traditional courses. In the assessment process, we found surprising results, particularly in the summative assessment process of collecting data for continuous improvement and ABET outcomes. Some possible explanations for the results will be offered.

关键词： technology transfer

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