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International conference on Information visualisation (IV)

作者： H. Lin G.J. Clapworthy F. Dong M. Krokos J. Shi Department of Computer & Information Sciences De Montfort University Milton Keynes UK State Key Laboratory of CAD&CG University of Zhejiang Hangzhou China

Navigation path planning is a crucial part of virtual endoscopy, but the identification of the optimal fly-through path is a time-intensive process. This paper describes a prototype system for virtual endoscopy and proposes a slice-based approach to calculating the path of the virtual camera that uses the slice borderlines of region-of-interest images to obtain the approximate centreline, centralised locally with respect to the hollow object wall. By using the 2D slice borderlines to express the hollow object boundary, the path searching and polygon intersection computing are simplified and made more efficient. Finally, we present results of our algorithm tested on the Visible Human data set.

关键词： Endoscopes Navigation Cameras Visualization Humans Data mining Optical imaging Computed tomography Magnetic resonance imaging computer graphics

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View morphing using sprites with depth

View morphing using sprites with depth

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International conference on Information visualisation (IV)

作者： Youngsup Park Kyunghyun Yoon Department of Image Engineering Graduate School of Advanced Imaging Science and Film Chung-Ang University Seoul South Korea

Recently there has been a great deal of interest in morphing techniques to produce intermediary images between two images. These techniques combine 2D interpolations of shape and color to make realistic special effects. The authors simulate view morphing, using sprites with depth about a pair of partially occluded images based on the epipolar geometry. The epipolar constraints improve the accuracy of the estimated disparity maps. To compute a depth map between two images, we use use a simple stereo system. Depth can be estimated from the disparity of corresponding points and is inversely proportional to disparity, used when sprites are composed. A sprite is an image with the standard three-color components (red, green, blue) and an additional channel that encodes the image's shape. In the case of a pair of partially occluded images, whether there should be decomposed sprites to an image is the reason for attributing to reduce two problems (folds and holes), in the view morphing procedures.

关键词： Sprites (computer) Rendering (computer graphics) Geometry Pixel Layout Automatic control Cameras Image reconstruction Shape Virtual reality

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Pen-and-ink rendering in volume visualisation

Pen-and-ink rendering in volume visualisation

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IEEE conference on Visualization

作者： S.M.F. Treavett M. Chen Department of Computer Science University of Wales UK

Concerns the development of non-photorealistic rendering techniques for volume visualisation. In particular, we present two pen-and-ink rendering methods, a 3D method based on non-photorealistic solid textures, and a 2/sup +/D method that involves two rendering phases in the object space and the image space respectively. As both techniques utilize volume- and image-based data representations, they can be built upon a traditional volume rendering pipeline, and can be integrated with the photorealistic methods available in such a pipeline. We demonstrate that such an integration facilitates an effective mechanism for enhancing visualisation and its interpretation.

关键词： Rendering (computer graphics) Visualization Pipelines Biomedical imaging Humans Magnetic resonance imaging computer graphics computer science Solids Casting

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Direct annotation: a drag-and-drop strategy for labeling photos

Direct annotation: a drag-and-drop strategy for labeling pho...

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International conference on Information visualisation (IV)

作者： B. Shneiderman H. Kang Department of Computer Science Human-Computer Interaction Laboratory Institute for Advanced Computer Studies & Institute for Systems Research University of Maryland College Park MD USA

Annotating photographs is such a time-consuming, tedious and error-prone data entry task that it discourages most owners of personal photo libraries. By allowing the user to drag labels, such as personal names, from a scrolling list and drop them onto a photo, we believe we can make the task faster, easier and more appealing. Since the names are entered in a database, searching for all photos of a friend or family member is dramatically simplified. We describe the user interface design and the database schema to support direct annotation, as implemented in our PhotoFinder prototype.

关键词： Labeling Databases History Libraries Cities and towns Biomedical imaging computer science Laboratories Educational institutions computer errors

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A knowledge-based approach to 3-D reconstruction of human cerebral vasculature

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computerS IN BIOLOGY AND MEDICINE 1998年第4期28卷 405-413页

作者： Zrimec, T Univ Ljubljana Fac Comp & Informat Sci Ljubljana 1000 Slovenia

Good visualisation of the vasculature is essential in the diagnosis and treatment of a variety of brain disorders. This paper presents a new approach to 3-D reconstruction of vascular structures using knowledge-based image processing and multimodal image fusion. The task is to reconstruct the human cerebro-vascular system from the partial information collected from a variety of medical imaging instruments and then recombine these limited models into an anatomically accurate one. (C) 1998 Elsevier Science Ltd. All rights reserved.

关键词： knowledge-based image processing cerebral vasculature modelling symbolic representation computer graphics arteriovenous malformations

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visualisation and reconstruction in dentistry

Visualisation and reconstruction in dentistry

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International conference on Information visualisation (IV)

作者： M.H. Shimabukuro R. Minghim UNESP Sao Paulo Brazil

visualisation in the field of dentistry has not, thus far, reached the same development as other medical fields. Potential applications of visualisation techniques in this area, however, are many, ranging from educational displays to training for delicate procedures. This paper reports on the investigation of techniques for handling 3D models of teeth, aiming at the investigation of dental structures. An algorithm was implemented for this purpose, which reconstructs 3D teeth models from 2D contour slices. Results employing various data sets are presented, including the output of VRML models for exploration.

关键词： Dentistry Teeth Medical diagnostic imaging Mouth Virtual reality Read only memory Data visualization Application software computer applications Software packages

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Fast automated segmentation and visualisation methods for MR images of the knee joint in arthritis

Fast automated segmentation and visualisation methods for MR...

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Annual International conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： R.I. Kitney P.M.M. Cashman M.E. Carter Department of Biological and Medical systems Imperial College London London UK

To highlight the diagnostic information in MR slice images of early knee joint damage, due to osteoarthritis (OA) or trauma, we have developed techniques for automated segmentation and rendering of the major joint structures. Using a 1.5 T GE body scanner we obtained sagittal T1-weighted spin echo images from 4 volunteers and 2 patients with OA. Segmentation was performed using MIDAS (Medical Information Display and Analysis System: Imperial College). From seed points on a midline "training" slice, the program searched all slices, locating the boundaries of the femur, tibia, patella, menisci and cruciate ligaments. The overall process was many times faster than manual segmentation. The joint components were then rendered as a composite 3D object allowing "virtual dissection" by the user. Osteophytes and soft-tissue abnormalities were revealed, viewable from any angle. The authors are now using newer MR sequences to detect the articular cartilage so that this can be added to the 3D model to indicate damage from OA. They believe that refinement of these techniques will enable visualisation of early changes to the joint structures, proving clinically useful in diagnosis and management of OA.

关键词： Image segmentation Visualization Joints Knee Osteoarthritis Rendering (computer graphics) Biomedical imaging Medical diagnostic imaging Displays Image analysis

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The graphical demands on medical visualisation systems using the WWW: a case study

The graphical demands on medical visualisation systems using...

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International conference on Information visualisation (IV)

作者： G.J. Clapworthy M. Krokos Department of Computer & Information Sciences De Montfort University Kents Hill UK

The Internet provides an excellent facility both for disseminating medical information rapidly and for accumulating a coherent and widely available body of medical reference material, and the medical community has recently begun to tap its potential in a number of ways. The paper describes a service which is available on the WWW and which is designed to provide a 3D visualisation system to advance the education of medical students and the professional development of qualified medical practitioners. Particular reference is made to the type of graphical support demanded by such a system, and the feasibility of providing such a resource, taking into account the equipment currently available to the likely users. A discussion of related issues such as user requirements and medical standards is included, and possible future developments are identified.

关键词： World Wide Web computer aided software engineering Internet Biomedical imaging Visualization Identity-based encryption Standards development computer graphics computer science education computer languages

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Holographic imaging of lines: a texture based approach

Holographic imaging of lines: a texture based approach

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International conference on Information visualisation (IV)

作者： A. Ritter O. Deussen H. Wagener T. Strothotte Department of Simulation and Computer Graphics Otto-von-Guericke University of Magdeburg Magdeburg Germany

Holography is a method for three dimensional imaging of objects. We present an approach for the generation of holograms, exploiting standard graphics rendering methods and hardware. We focus on the visualization of objects composed of line segments, which allow for certain simplifications, and thus hologram generation speedup. Our method is based on the derivation of a holographic geometric equivalent of the object to be imaged. In this equivalent, the object is represented as a set of geometric primitives combined with precomputed textures. The equivalent is built up under prescribed conditions, thus simulating certain wave characteristics. The hologram of the object to be imaged is gained just by rendering its holographic geometric equivalent. Problems of achieving the necessary resolution of the output hologram are addressed.

关键词： Holography Electrical capacitance tomography Holographic optical components Laser beams computer graphics Visualization Virtual reality computer displays Optical films Image reconstruction

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Quantifying the objective quality of voxel based data visualizations produced by a ray caster: a proposal

Quantifying the objective quality of voxel based data visual...

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International conference on Information visualisation (IV)

作者： B. Sousa Santos J. Nunes C. Coimbra C. Ferreira A.M. Tome N. Lau Departamento de Electróca e Telecomunicações da Universidade de Aveiro Portugal Universidade de Aveiro Portugal Departamento de Matemática da Universidade de Aveiro Portugal

A set of parameters to assess the objective quality of visualizations of a voxel-based data set, produced using a ray caster, is proposed as a first step toward the evaluation of the overall quality of these visualizations. Results obtained using synthetic data and a simple implementation of a ray caster are presented. The final goal of this evaluation is the computation of "confidence indices" that could offer the user a "guided visualization", i.e. allow him/her to decide what are the "best" visualizations of a data set.

关键词： Data visualization Data acquisition Displays Virtual reality Proposals Telecommunications Biomedical imaging Rendering (computer graphics) Biomedical signal processing Computational geometry

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