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A visualization environment for electron microscopy

A visualization environment for electron microscopy

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pacific conference on computer graphics and applications

作者： I.M.B. Martin D.C. Marinescu Department of Computer Science Indiana University South Bend IN USA Department of Computer Science Purdue University West Lafayette IN USA

Describes an environment for visualization and processing of low-dose, low-contrast electron micrographs of biological specimens. We focus on image selection, the first step in the process of reconstruction of the 3D structure of a specimen from its projections. Noise from a variety of sources makes automatic detection of particle positions a difficult task. New image acquisition devices and modern electron microscopy methods require the processing and rendering of very large images (50-100 million pixels). We describe techniques for processing large images, algorithms for detecting particle positions on compressed images using the crosspoint method, and methods for position refinement. EMMA, an interactive visualization environment for experimenting with particle identification methods is presented.

关键词： Visualization Electron microscopy Fourier transforms Image reconstruction computer science Density functional theory Biology Working environment noise Rendering (computer graphics) Pixel

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Virtual Stage: a scenario-based karaoke system in a virtual environment

Virtual Stage: a scenario-based karaoke system in a virtual ...

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pacific conference on computer graphics and applications

作者： Kee Chang Lee Chang Whan Sul Kwang Yun Wohn Department of Computer Science Korea Advanced Institute of Science and Technology Taejon South Korea

ISBN: (纸本)0818680288

We describe our on-going work on Virtual Stage, a karaoke system which incorporates virtual reality technology. A runtime environment and authoring tools for interactive scenarios have been designed and implemented. We adopt a scenario-based representation to unfold a story in the virtual environment. A producer can make Virtual Stage applications which reflect his/her own scenario. While singing-along to the song played by Virtual Stage, the participants use their body to interact with virtual characters which behave intelligently in the virtual environment. The scenario written via authoring tools describes the interaction between the participant and virtual characters. The system analyzes video images of the participant to extract participant-related data, then the video image is composed into the rendered scene of a virtual environment.

关键词： Virtual environment Virtual reality Rendering (computer graphics) Layout Multimedia systems Artificial intelligence TV Games Intelligent agent Intelligent networks

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A 3-D string figure display system for animating cat's cradle game

A 3-D string figure display system for animating cat's cradl...

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pacific conference on computer graphics and applications

作者： R. Budiarto M. Yamada H. Seki H. Itoh Department of AI & Computer Science Nagoya Institute of Technology Nagoya Japan

Implements a display system for cat's cradle game animation in 3D. The input to our system, finger actions, originates from a user. Based on this input, we animate the finger actions and display an operated pattern of string figures. A stabilizing procedure is in charge of obtaining a stable state of the string figures. Processing string figures on a computer is difficult, since the string's dynamics are still unknown. Our system uses a set-of-crossings representation method for processing string figures. We employ some local transformations of the string figures to stabilize them. Furthermore, topological characteristics of the string figures can be observed.

关键词： Animation Fingers computer displays Three dimensional displays Shape Artificial intelligence computer science Equations Mice

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Template-based rendering of run-length encoded volumes

Template-based rendering of run-length encoded volumes

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pacific conference on computer graphics and applications

作者： Cheol-Hi Lee Yun-Mo Koo Yeong Gil Shin Department of Computer Science Seoul National University Seoul South Korea Department of Computer Engineering Seoul National University Seoul South Korea

ISBN: (纸本)0818680288

Template-based volume rendering is an acceleration technique for volume ray casting. It does not trade-off the image quality for the rendering speed. However, it still falls short of interactive manipulation of volume data, mainly due to the ray-by-ray volume access pattern and the long ray path in the transparent regions. In this paper, we present an object-order template-based volume rendering method that uses run-length encoding to enable the skipping of highly transparent regions. We present three algorithms, one for each principal axis direction. By combining the advantages of object-order volume traversal and run-length encoded volumes, the algorithms achieve high-quality rendering in a much shorter time than the original template-based volume rendering.

关键词： Rendering (computer graphics) Image quality Acceleration Casting Image sampling Data visualization Workstations Gas insulated transmission lines computer science Encoding

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Rendering of spherical light fields

Rendering of spherical light fields

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pacific conference on computer graphics and applications

作者： Insung Ihm Sanghoon Park Rae Kyoung Lee Department of Computer Science Sogang University Seoul South Korea

ISBN: (纸本)0818680288

A plenoptic function is a parameterized function describing the flow of light in space, and has served as a key idea in building some of the recent image based rendering systems. The paper presents a new representation scheme, called a spherical light field, of the plenoptic function, that is based on spheres. While methods using spherical coordinates are thought to require substantially more computation than those using planar or cylindrical coordinates, we show that spheres can also be used efficiently in representing and resampling the flow of light. Our image based rendering algorithm is different from the previous systems, the light field and lumigraph, in that it is an "object space" algorithm that can be easily embedded into the traditional polygonal rendering system. Our method is easily accelerated by 3D graphics boards that support the primitive functionality, such as viewing and smooth shading. In addition, we introduce an encoding scheme based on wavelets for compression of the huge data resulting from sampling of the spherical light field. The proposed technique can be easily adapted to compress the light field and lumigraph data, and offers as high compression ratios as the previous methods. Furthermore, it naturally creates a multi resolutional representation of the light flow that can be exploited effectively in the future applications. We show how to access the compressed data efficiently using a modified significance map and an incremental decoding technique, and report experimental results on several test data sets.

关键词： Rendering (computer graphics) Layout Image generation computer science Encoding Sampling methods Decoding Testing computer graphics Ray tracing

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Fast volume rendering using adaptive block subdivision

Fast volume rendering using adaptive block subdivision

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pacific conference on computer graphics and applications

作者： Choong Hwan Lee Kyu Ho Park Computer Engineering Research Laboratory Department of Electrical Engineering Korea Advanced Institute of Science and Technology Taejon South Korea

ISBN: (纸本)0818680288

We propose a fast volume rendering scheme that greatly reduces ray-casting overheads by adaptive block subdivision. We first apply a uniform space subdivision for constructing the adaptively subdivided volume. Then we merge coherent uniform blocks to generate adaptive-sized blocks that are efficient for leaping space. To accomplish this, an efficient block merging algorithm based on a boundary following and scan-filling strategy is proposed. Experimental results show that our fast volume rendering scheme is superior to other schemes in constructing a data structure for fast rendering; due to its simple construction approach, construction speed is more than three times faster than a hierarchical data structure, the octree. A 25% to 70% performance gain in rendering time over the octree is also exhibited. The additional advantages of our scheme are a stable acceleration for animation and an associativity with a compression-based volume rendering.

关键词： Space technology Merging Acceleration Laboratories Paper technology Data structures Timing Animation Data visualization computer graphics

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Real-time virtual humans

Real-time virtual humans

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pacific conference on computer graphics and applications

作者： N.I. Badler Center for Human Modeling and Simulation Department of Computer and Information Science University of Pennsylvania Philadelphia PA USA

The last few years have seen great maturation in the computation speed and control methods needed to portray 3D virtual humans that are suitable for real interactive applications. We first describe the state of the art, then focus on the particular approach taken at the University of Pennsylvania with the Jack system. Various aspects of real-time virtual humans are considered, such as their appearance and motion, interactive control, autonomous actions, gestures, attention, locomotion and multiple individuals. The underlying architecture consists of a sense-control-act structure that permits reactive behaviors to be locally adaptive to the environment, and a PaT-Net (parallel transition network) parallel-finite-state machine controller that can be used to drive virtual humans through complex tasks. We then argue for a deep connection between language and animation and describe current efforts in linking them through two systems: the Jack Presenter and the JackMOO extension to lambdaMOO. Finally, we outline a parameterized action representation for mediating between language instructions and animated actions.

关键词： Humans Biological system modeling Computational modeling Application software Lifting equipment Animation Embedded computing Avatars Shape computer simulation

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Dynamic process management for avoiding the confliction between the development of a program and a job for producing animation frames

Dynamic process management for avoiding the confliction betw...

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pacific conference on computer graphics and applications

作者： K. Tadamura E. Nakamae Faculty of Business Hiroshima Prefectural University Japan Faculty of Engineering Hiroshima Institute of Technology Hiroshima Japan

Distributed processing systems which consist of multiple graphics workstations (GWSs) are being used in many computer graphics laboratories (CG labs). This paper proposes a method for improving the operation efficiency at a CG lab by avoiding the conflict between a job for producing animation frames with no human interaction and the development of a program which needs some interaction by a human. That is, concerning the jobs being executed on a UNIX workstation, long-time jobs like the former and short-time jobs like the latter are detected. Based on the result of the detection, the status of the process for producing animation frames is controlled to be either "sleeping" or "running", automatically in a short time. The process control functions on a standard UNIX system are statically controlled by using the priority of a process. The system is restricted as follows: once a process starts executing, there is no way to control the process from outside of it. The proposed method removes this restriction, i.e. the status of the process for producing animation frames is controlled dynamically. By using the proposed method, an animation can be produced on a GWS in a short period without lowering the efficiency of the other jobs, like the development of a program in a CG lab.

关键词： Animation Character generation Automatic control computer graphics Workstations Humans Process control Control systems Distributed processing Laboratories

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Novel multiresolution metrics for content-based image retrieval

Novel multiresolution metrics for content-based image retrie...

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pacific conference on computer graphics and applications

作者： Zheng-Yun Zhuang Ming Ouhyoung Communications and Multimedia Laboratory Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan

ISBN: (纸本)0818680288

This paper proposes three new ideas and one revision concerning image metrics and their applications. Of most importance is the multiresolution shape metric, which measures distances according to image content shape information. Accompanied with it is a feature/non-feature image characterization philosophy. The second effort is the modification of an existing color metric, whose distance computation is dominated by color distribution of images. The third idea concerns the image querying behavior of the general public, so as to propose and design a versatile power metric, which holds the properties of both the shape metric and the color metric, for dealing with various kinds of hand-drawn queries. Finally, after applying the shape metric to video shot boundary detection, a multiresolution scene change detection algorithm is proposed. For now, we have implemented these metrics on a personal computer for two applications. One is for image database management with content-based indexing and the other is for video shot boundary detection. Experiments show that the speed and the accuracy of both image retrieval and scene change detection are quite good.

关键词： Image resolution Image retrieval Content based retrieval Shape measurement Gunshot detection systems Layout Distributed computing Detection algorithms Microcomputers Application software

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SharedWeb-a shared virtual environment over World Wide Web

SharedWeb-a shared virtual environment over World Wide Web

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pacific conference on computer graphics and applications

作者： Jiung-Yao Huang Chao-Tsou Fang-Tsou Jui-Fa Chen Fu-Bin Wang Multimedia & Virtual Reality Lab Institute of Computer Science and Information Engineering Tamkang University Taipei Taiwan

ISBN: (纸本)0818680288

Describes the design implementation and experimental results for a multi-user 3D World Wide Web (WWW) browsing system called SharedWeb, which is based on the request-response method of a WWW server. The key features of this system include: (i) the WWW server's ability to remember all the browsers connected to it in order to transmit those messages required to maintain consistent states among the browsers, (ii) the dead-reckoning technique of distributed interactive simulation (DIS) used by the browsers in order to reduce the number of messages sent out on the network and to satisfy the timing requirement demanded by virtual environments, and (iii) the protocol data unit (PDU), also used in DIS, adapted by the SharedWeb system in order not only to include more information about the browsers but also to integrate SharedWeb with DIS in the near future.

关键词： Virtual environment Web sites World Wide Web Dead reckoning Protocols Layout Chaos Virtual reality computer science Design engineering

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