The tutorial presents state-of-the-art visualization techniques inspired by traditional technical and medical illustrations. Such techniques exploit the perception of the human visual system and provide effective visu...
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ISBN:
(纸本)0780394623
The tutorial presents state-of-the-art visualization techniques inspired by traditional technical and medical illustrations. Such techniques exploit the perception of the human visual system and provide effective visual abstractions to make the visualization clearly understandable. Visual emphasis and abstraction has been used for expressive presentation from prehistoric paintings to nowadays scientific and medical illustrations. Many of the expressive techniques used in art are adopted in computergraphics, and are denoted as illustrative or non-photorealistic rendering. Different stroke techniques, or brush properties express a particular level of abstraction. Feature emphasis or feature suppression is achieved by combining different abstraction levels in illustrative rendering. Challenges in visualization research are very large data visualization as well as multi-dimensional data visualization. To effectively convey the most important visual information there is a significant need for visual abstraction. For less relevant information the dedicated image space is reduced to enhance more prominent features. The discussed techniques in the context of scientific visualization are based on iso-surfaces and volume rendering. Apart from visual abstraction, i.e., illustrative representation, the visibility of prominent features can be achieved by illustrative visualization techniques such as cut-away views or ghosted views. The structures that occlude the most prominent information are suppressed in order to clearly see more interesting parts. A different smart way to provide information on the data is using exploded views or other types of deformation. Furthermore intuitive feature classification via 3D painting and manipulation with the classified data including label placement is presented. Discussed non-photorealistic and illustrative techniques from visualization and graphics are shown from the perspective as tools for illustrators from medicine, botany, archeology
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 framewo...
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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.
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...
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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
As virtual environment technology becomes accessible and affordable, there has been an increase in constructing and connecting virtual worlds. Networked virtual environments allow us to meet and interact with people e...
As virtual environment technology becomes accessible and affordable, there has been an increase in constructing and connecting virtual worlds. Networked virtual environments allow us to meet and interact with people even though they may be located in different parts of the world. It has been employed in many simulative applications such as manufacturing, business, education, medicine and so on. Networked virtual environment can be more realistic and powerful by applying mixed reality technology merging real and virtual worlds. Focusing on the theme about building and connecting mixed worlds, technical issues are analyzed in terms of data acquisition, visualization, interaction, network communication, and so on. Exploring related work of many research laboratories, future possibilities are also discussed.
Optical burst switching has been receiving increased attention as a promising technology for building the next-generation optical Internet. This article presents the design and discusses the implementation of an overl...
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Optical burst switching has been receiving increased attention as a promising technology for building the next-generation optical Internet. This article presents the design and discusses the implementation of an overlay mode optical burst-switched network testbed. A flexible "transceiver + forwarding" edge node architecture is proposed to perform both electronic burst assembly/disassembly and optical burst forwarding. It is designed to provide class of service and wavelength selection for locally generated bursts, and transparency to cut-through bursts. The functional modules of the control plane and related key design issues are presented. In particular, we discuss a scheduling mechanism that efficiently combines two different contention resolutions in space and wavelength domains. Experimental results show the effectiveness of this scheme in reducing burst blocking probability. Furthermore, the performance of the network testbed and corresponding methods of improving it are discussed.
Ecce Homology, a physically interactive new-media work, visualizes genetic data as calligraphic forms. A novel computervision based user interface allows multiple participants, through their movement in the installati...
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ISBN:
(纸本)9781450378291
Ecce Homology, a physically interactive new-media work, visualizes genetic data as calligraphic forms. A novel computervision based user interface allows multiple participants, through their movement in the installation space, to select genes from the human genome for visualizing the Basic Local Alignment Search Tool (BLAST), a primary algorithm in comparative genomics.
In this paper we propose a touch enabled video player system. A conventional video player only allows viewers to passively experience visual and audio media. In virtual environment, touch or haptic interaction has bee...
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This paper focuses on the method used for traffic control system in dilemma-zone detection. Our research systems based on a general purpose of minimizing the probability for accident that resulted from signal phase te...
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This paper focuses on the method used for traffic control system in dilemma-zone detection. Our research systems based on a general purpose of minimizing the probability for accident that resulted from signal phase termination especially at night. This objective is accomplished by using image detectors to monitor vehicle existence in the dilemma zone and then extending the phase until the dilemma zone is cleared or until a maximum green is reached. The systems described have additional objectives that are intended to provide other safety or operational benefits. Arena simulations are used to determine the existence of vehicle in the dilemma zone. Our main goal is to instruct drivers' decision while approaching the intersection by using the traffic signal control.
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