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imaging vector field using SMP images

Imaging vector field using SMP images

引用

computer Aided Design and computer graphics, 2005. Ninth International conference on

作者： Wei Guo Jianyun Chai Yu Zhao Zesheng Tang Department of Computer Science & Technology Tsinghua University Beijing PRC 100084

ISBN: (纸本)0769524737

This paper presents a new concept of texture image method for displaying divergent-free vector field on surfaces, sine modulated potential (SMP) map. A scalar potential for such vector field is first defined. Field vectors are then mapped to a grayscale image through its scalar potential modulated with a sine function. The image visualizes a soft appearance of flux tubes instead of flux lines, whose orientation and width reflect the direction and amplitude of field vectors respectively. Animated SMP images can identify the exact "flow" direction inside each flux tube for the vector field at a specific moment, which is often missed in other visualization techniques. SMP images can also be animated for visualization of time-varying field, in which the variation of the field in space and the variation with time can be revealed simultaneously.

关键词： data visualisation image texture SMP images divergent-free vector field grayscale image sine modulated potential map texture image

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3D reconstruction and visualisation for exploration of human axillary lymph nodes

3D reconstruction and visualisation for exploration of human...

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International conference on Medical Information visualisation - Biomedical visualisation (MediVis)

作者： J.R. Maddison E.C. Paish T. Kurien R.D. Macmillan A.R. Green G.Y. Tian I.O. Ellis School of Computing and Engineering University of Huddersfield UK Breast Cancer Pathology Research Group Department of Histopathology Nottingham City Hospital NHS Trust University of Nottingham UK Nottingham Breast Institute Nottingham UK

visualisation and data exploration is of interest in many areas of medicine. 3D reconstruction can lead to better understanding of structures and disease growth patterns. 3D serial section alignment and reconstruction techniques can be used for visualisation of complex histological data samples. Presented are the method and results using a system offering semi automated serial section alignment, and the use of voxel based rendering to construct informative visual representation of metastatic distribution within lymph nodes. The system developed has been implemented on a standard PC platform. The systems performance allows for installation and use on an inexpensive computing platform, with a modest PC producing rendering times of less than 1 second per image.

关键词： Humans Lymph nodes Image reconstruction Data visualization Rendering (computer graphics) Biomedical imaging Diseases Metastasis Standards development System performance

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Distributing stereoscopic scientific visualisation across the grid

Distributing stereoscopic scientific visualisation across th...

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Proceedings of the Seventh IASTED International conference on computer graphics and imaging

作者： Charters, Stuart M. Holliman, Nicolas S. Munro, Malcolm Visualisation Research Group e-Science Research Institute University of Durham South Road Durham DH1 3LE United Kingdom

An architecture that allows stereoscopic scientific visualisation to be distributed across the grid is presented. As the quantity of data generated by scientists increases so does the need for tools to analyse and interpret that data: visualisation is one such tool. The architecture presented allows resources distributed across the grid to be brought together and allows scientists to build effective stereoscopic visualisations that can provide insight and help in the understanding of the data being analysed.

关键词： Special effects

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Perception of colour and space in virtual reality:: A comparison between a real room and virtual reality models

Perception of colour and space in virtual reality:: A compar...

引用

conference on Human Vision and Electronic imaging IX

作者： Billger, M Heldal, I Stahre, B Renström, K Chalmers Univ Technol S-41296 Gothenburg Sweden

ISBN: (纸本)0819451959

Virtual Reality has great potential to become a usable design tool for the planning of light and colour in buildings. The technical development has provided us with better computer graphics and faster rendering techniques. However, the reliability and usability is delimited by lack of knowledge about how humans perceive spatial colour phenomena. The setting up of parameters for material properties in light calculation software is done arbitrarily. We present a comparison between a real room and a digital model evaluated on a desktop PC and in an Immersive Projection Technology (IPT) type system. Data were collected from video recorded interviews and questionnaires. The participants assessed the appearance of light, colours and space. They also evaluated their involvement in solving this task, and their presence in each environment. Our results highlight the benefits and disadvantages of the real and virtual models. The participants had difficulties in estimating the size of both the desktop room and the room in the IT? system. The comparison of real and virtual rooms revealed unsatisfying differences in shadowing and colour appearance. We defined the magnitude of perceived colour reflections in the real room, and elaborated with some of the parameters in Lightscape/3dsmax6.

关键词： colour appearance virtual environments light visualisation colour bleeding

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PC-based volume rendering for medical visualisation and augmented reality based surgical navigation

PC-based volume rendering for medical visualisation and augm...

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International conference on Information visualisation (IV)

作者： R.J. Lapeer R.S. Rowland Min Si Chen School of Computing Sciences University of East Anglia Norwich UK

We describe a generic software architecture for stereoscopic augmented reality microsurgery, built upon a general framework for volume rendering based 3D visualisation. The software is called ARView and allows the user to perform the standard procedures for stereoscopic augmented reality surgical navigation: calibration of a visualisation device; registration of pre-operatively and intra-operatively acquired patient image data; overlaying with either volume or surface rendered (segmented) data using different methodologies; and tracking of moving objects in the surgical scene.

关键词： Visualization Augmented reality Surgery Navigation Rendering (computer graphics) Biomedical imaging Software architecture Microsurgery Software performance Software standards

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Estimating the "mental image" for comprehensible rendering of 3D objects

Estimating the "mental image" for comprehensible rendering o...

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International conference on Information visualisation (IV)

作者： R. Zenka P. Slavik Faculty of Electrical Engineering Department of Computer Science and Engineering Czech Technical University Prague Czech Republic

We present a method for comprehensible nonphotorealistic rendering of 3D free-form objects. The objects are rendered using a small amount of lines such as silhouettes or hatching strokes. The lines are carefully placed to ensure the user would understand the structure of the rendered object correctly. The user's "mental image" of the object is estimated using simplified methods of computer vision, allowing 3D shape reconstruction from the rendered image. The difference between the original model and the estimated "mental image" is used as a feedback for refining the line placement. The process stops when the difference is sufficiently low, which means the users would understand the rendering sufficiently well despite its simplicity.

关键词： Rendering (computer graphics) Shape Image reconstruction Feedback computer science computer vision Photography Biomedical imaging Back Brain modeling

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Haptic granular synthesis: targeting, visualisation and texturing

Haptic granular synthesis: targeting, visualisation and text...

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International conference on Information visualisation (IV)

作者： A. Crossan J. Williamson R. Murray-Smith Hamilton Institute National University of Ireland Maynooth Ireland Department of Computing Science University of Glasgow Glasgow UK

This work introduces the idea of haptic rendering using granular synthesis - an established technique for synthesising audio. It describes the technique along with potential application areas, and initial results from an implementation on a PHANToM force feedback device. Three main applications are considered. Firstly, rendering of probabilistic vector fields for presenting ambiguity and context information to the user. Secondly, the possibility of producing textured virtual objects using granular synthesis is discussed. Thirdly, we use the approach to display scatterplot data on haptic devices.

关键词： Haptic interfaces Visualization Distribution functions imaging phantoms Displays Space technology Force feedback Acoustic scattering Testing Rendering (computer graphics)

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Real-time visualisation within the Multimod Application Framework

Real-time visualisation within the Multimod Application Fram...

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International conference on Information visualisation (IV)

作者： M. Krokos A. Savenko G.J. Clapworthy H. Lin R. Mayoral M. Viceconti S. Van Sint Jan Department of Computing & Information Systems University of Luton Luton UK Laboratorio di Tecnologia Medica Istituti Ortopedici Rizzoli Bologna Italy Department of Anatomy (CP 619) University of Brussels Belgium

This work gives an overview of real-time visualisation algorithms developed under the EC-funded project Multimod to support a novel paradigm for the virtual representation of musculo-skeletal structures. These algorithms are fully integrated into the Multimod Application Framework (MAF), an open-source freely-available software framework for the rapid development of medical visualisation applications. MAF is based on the visualisation toolkit (VTK) and other specialised toolkits, e.g. for image registration and segmentation, collision detection or numerical computation. MAF provides a range of high-level components that can be easily combined for rapid construction of visualisation applications that support synchronised views. The majority of algorithms available within the standard underlying MAF toolkits were frequently either too slow or too general for our purposes. We have thus implemented computationally efficient versions of existing algorithms, e.g. for surface and volume rendering, and more importantly, developed new techniques, e.g. for X-ray rendering and designing volume rendering transfer functions. To achieve interactive rendering we have employed a scheme for space partitioning. The emphasis is on exploiting the characteristics of medical datasets (e.g. density value homogeneity) but further utilising the hardware-accelerated capabilities of modern graphics cards. In this context, calculations are moved into hardware as appropriate while avoiding dependency on specialised features of particular manufacturers so as to ensure real code portability.

关键词： Visualization Application software Open source software Biomedical imaging Rendering (computer graphics) Software algorithms Image registration Image segmentation Partitioning algorithms Algorithm design and analysis

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Two-channel technique for high dynamic range image visualization

Two-channel technique for high dynamic range image visualiza...

引用

International conference on Information visualisation (IV)

作者： L. Capodiferro E.D. Di Claudio F. Iacolucci A. Laurenti G. Jacovitti Fondazione Ugo Bordoni Rome Italy INFOCOM Department University of Roma La Sapienza Rome Italy

Advances in digital imaging technologies make increasingly available high quality images characterized by high dynamic range (HDR) of color components. Usual display devices are unable to visualize the information content of HDR images, especially in presence of light. For this reason special compression techniques for image rendering on conventional displays have been developed. In this work, a new technique based on simultaneous compression of low frequency radiance variations and detail enhancement is presented. In this work, a method working in the transform domain of an edge oriented wavelet transform is presented. Low-frequency components and high-resolution wavelet coefficients are separately manipulated before image reconstruction in order to reduce the overall dynamic range. The effectiveness of the technique is shown by means of significant examples.

关键词： Dynamic range Visualization Displays Image coding Wavelet transforms Digital images Rendering (computer graphics) Frequency Wavelet domain Wavelet coefficients

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Formulated silhouettes for sketching terrain

Formulated silhouettes for sketching terrain

引用

conference on Theory and Practice of computer graphics

作者： Whelan, JC Visvalingam, M Univ Hull Dept Comp Sci Ctr Internet Comp Kingston Upon Hull HU6 7RX N Humberside England

ISBN: (纸本)0769519423

The mathematical definition of silhouettes within NPAR is based on the assumption that they are the eye-centred projections of occluding contours on an imaging plane. However, occluding contours are insufficient for sketching the silhouettes of hills as drawn by cartographers. The research reported in this paper is based on the proposition that silhouettes are mental visualisations of the outlines of objects that arise from knowledge and experience of the visual world. This paper does not seek to provide an alternative definition of silhouettes. Instead, it tests the proposition that missing silhouette elements should be drawn on those visible surfaces brought into view through adoption of a higher viewpoint.

关键词： silhouettes occluding contours algorithmic sketching terrain visualisation P-strokes

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