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International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Sarfraz, M. Department of Information and Computer Science King Fahd University of Petroleum and Minerais KFUPM#1510 Dhahran 31261 Saudi Arabia

ISBN: (纸本)0769526063

In many image analysis and computer vision applications, object recognition is the ultimate goal. This work presents study and experimentation for object recognition when isolated objects are under discussion. The circumstances of similarity transformations, presence of noise, and occlusion have been included as the part of the study. For simplicity, instead of objects, outline of the objects have been used for the whole process of the recognition. Fourier Descriptors have been used as features of the objects. Various similarity measures have been used and compared for recognition. The test objects are matched with the model objects in database and the object with the least similarity measure is taken as the recognized object. A detailed experimental study has been made under different conditions and circumstances. © 2006 IEEE.

关键词： Object recognition

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A cloth design system by intuitive operations

A cloth design system by intuitive operations

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International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Miyahara, Katsunori Okada, Yoshihiro Niijima, Koichi Graduate School of Information Science and Electrical Engineering Kyushu University 6-1 Kasuga-koen Kasuga Fukuoka 816-8580 Japan Intelligent Cooperation and Control PRESTO JST

ISBN: (纸本)0769526063

This paper proposes a new cloth design system that provides intuitive operations, e.g., sewing, cutting and fitting a cloth in a virtual 3D space through direct manipulations using a force-feedback device. Advances of computer hardware technologies and results of virtual reality researches make it possible to develop virtual reality applications those provide an immersive environment where the user manipulates 3D objects as if he/she existed in the real world. A lot of cloth simulation algorithms and systems have been proposed and existed so far. However, there is no cloth design system that provides intuitive operations enable the user to sew, cut and fit a cloth in a virtual 3D space as if he/she existed in the real world. So, the authors developed such a cloth design system. This paper describes what kind of model is employed for the cloth simulation, what kinds of operations are implemented, and quantitative performances of the system. © 2006 IEEE.

关键词： computer graphics

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Environment lighting for point sampled geometry

Environment lighting for point sampled geometry

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International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Feng, Liu Bhakar, Sushil Fevens, Thomas Mudur, Sudhir Department of Computer Science and Software Engineering Concordia University Montreal Que. H3G 1M8 Canada

ISBN: (纸本)0769526063

Point sampled geometry has recently gained significant interest due to the tremendous advances in the technology of 3D scanning and the representational simplicity afforded by avoiding any need for explicit connectivity information. Their use in creating high-quality rendered images is however still limited. Till date, most renderings of point sampled surfaces use the Phong illumination model. In this paper we consider the rendering of point sampled surfaces with both diffuse and specular material properties under distant illumination, as specified using an environment map. For this, we have combined two of the earlier works for continuous surfaces, spherical harmonic representations of irradiance environment maps and glossy reflection, and programmed it on the GPU using vertex and fragment shaders. This hardware accelerated implementation has been incorporated into a public domain point based renderer enabling us to efficiently produce high quality images of point sampled geometry. © 2006 IEEE.

关键词： computer graphics

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CoViCAD:: Comprehensive visualization of coronary artery disease

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IEEE TRANSACTIONS ON VISUALIZATION AND computer graphics 2007年第6期13卷 1632-1639页

作者： Termeer, Maurice Bescos, Javier Olivan Breeuwer, Marcel Vilanova, Anna Gerritsen, Frans Groller, M. Eduard Vienna Univ Technol Inst Comp Graph & Algorithms Vienna Austria Philips Med Syst Bothell WA USA Eindhoven Univ Technol NL-5600 MB Eindhoven Netherlands

We present novel, comprehensive visualization techniques for the diagnosis of patients with Coronary Artery Disease using segmented cardiac MRI data. We extent an accepted medical visualization technique called the bull's eye plot by removing discontinuities, preserving the volumetric nature of the left ventricular wall and adding anatomical context. The resulting volumetric bull's eye plot can be used for the assessment of transmurality. We link these visualizations to a 3D view that presents viability information in a detailed anatomical context. We combine multiple MRI scans (whole heart anatomical data, late enhancement data) and multiple segmentations (polygonal heart model, late enhancement contours, coronary artery tree). By selectively combining different rendering techniques we obtain comprehensive yet intuitive visualizations of the various data sources.

关键词： Biomedical MRI Cardiology Data visualisation Image Segmentation Medical Image Processing Co Vi CAD Visualization Coronary Artery Disease Patient Diagnosis Segmented Cardiac MRI Data Medical Visualization Bulls Eye Plot Whole Heart Anatomical Data Late Enhancement Data Polygonal Heart Model Late Enhancement Contours Coronary Artery Tree Coronary Arteriosclerosis Magnetic Resonance imaging Data Visualization Heart Myocardium Arteries Muscles Medical Diagnostic imaging Blood Protocols Cardiac MRI Late Enhancement Viability Bulls Eye Plot

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Basic transformations on virtual hexagonal structure

Basic transformations on virtual hexagonal structure

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International conference on computer graphics, imaging and visualisation, CGIV'06

作者： He, Xiangjian Jia, Wenjing Wu, Qiang Hur, Namho Hintz, Tom Wang, Huaqing Kim, Jinwoong Department of Computer Systems Faculty of Information Technology University of Technology Sydney Broadcasting System Research Group Digital Broadcasting Research Division Electronics Telecommunications Research Institute 161 Gajeong-dong Yuseong-gu Daejeon 305-700 Korea Republic of

ISBN: (纸本)0769526063

Hexagonal structure is different from the traditional square structure for image representation. The geometrical arrangement of pixels on hexagonal structure can be described in terms of a hexagonal grid. Hexagonal structure provides an easy way for image translation and rotation transformations. However, all the existing hardware for capturing image and for displaying image are produced based on square architecture. It has become a serious problem affecting the advanced research based on hexagonal structure. In this paper, we introduce a new virtual hexagonal structure. Based on this virtual structure, a more flexible and powerful image translation and rotation are performed. The virtual hexagonal structure retains image resolution during the process of image transformations, and does not introduce distortion. Furthermore, images can be smoothly and easily transferred between the traditional square structure and the hexagonal structure. © 2006 IEEE.

关键词： computer graphics

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Environment lighting for point sampled geometry

Environment lighting for point sampled geometry

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International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Liu, Feng Bhakar, Sushil Fevens, Thomas Mudur, Sudhir Department of Computer Science and Software Engineering Concordia University Montreal Que. H3G 1M8 Canada

ISBN: (纸本)0769526063

关键词： computer graphics

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Visual computer game features for teaching Relativity

Visual computer game features for teaching Relativity

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International conference on computer graphics, imaging and Visualization

作者： Carr, David Charles Sturt University Australia

ISBN: (纸本)9780769541662

In this paper we describe incorporating Einstein's Special Theory of Relativity into an interactive computer game intended for learning and teaching purposes in Australian senior high school and tertiary education. The game, which is based on Asteroids, embeds either a classical or relativistic model of physics in the game environment such that players interact directly with the physics in the course of playing, and can observe and contrast their behaviour. The emphasis is on conceptual portrayal with 2D graphics, rather than immersive and realistic 3D visualisation. The key relativistic concepts of length contraction, time dilation, and mass dilation are each represented, as well as Doppler shifting of colour. We discuss design considerations and graphical devices for portraying these effects in the game, along with results and responses from user experiments. © 2010 IEEE.

关键词： Relativity

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Traversal on DAG-based multiresolution mesh hierarchy

Traversal on DAG-based multiresolution mesh hierarchy

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International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Zheng, Zhi Chan, Tony K.Y. School of Computer Engineering Nanyang Technological University Singapore Singapore

ISBN: (纸本)0769526063

Traversal algorithm on the multiresolution hierarchy is critical for the view-dependent level of detail system. In this paper, we study multiresolution hierarchy traversal for a DAG hierarchy of vertex-split/edge-collapse operations, in the context of a client-server based system. We present a general traversal management strategy that is beneficial for interactive frame rate and triangle-budget control, and is also favorable for the client-server based system. We adapt two commonly used traversal algorithms, linear traversal and priority-oriented traversal, to work under the management strategy. And we also propose a constant-time traversal algorithm. Extensive experiments on these three traversal algorithms are done and the comparison results can be used as a guide to choose the most appropriate traversal algorithm for different system requirements. © 2006 IEEE.

关键词： Hierarchical systems

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Active contour model with shape constraints for bone fracture detection

Active contour model with shape constraints for bone fractur...

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International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Jia, Y. Jiang, Y. Department of Computer Science Ryerson University Toronto Ont. M5B 2K3 Canada

ISBN: (纸本)0769526063

This paper presents a segmentation method that outlines fractured bones in an X-ray image of a patient's arm within casting materials, and displays the alignment between the fractured bones. This segmentation task is often difficult because the casting materials cause a low contrast and high noise ratio in the X-ray images. A geodesic active contour model with global constraints is applied to this task. A prior shape is collected and used as a global constraint of our model. A maximum-likelihood function is derived to provide feedback for each evolving process. Experimental results show that the method produces the outlines of the fractured bones on the low contrast X-ray images robustly and accurately. © 2006 IEEE.

关键词： Image segmentation

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Frequency-domain algorithms for visual analysis on genomic structures in prokaryotes

Frequency-domain algorithms for visual analysis on genomic s...

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International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Cheong, Lee Sing Lin, Feng Seah, Hock Soon Bioinformatics Research Centre Nanyang Technological University Nanyang Avenue Singapore 639798 Singapore School of Computer Engineering Nanyang Technological University Nanyang Avenue Singapore 639798 Singapore

ISBN: (纸本)0769526063

Frequency-domain algorithms are studied to provide the composition of each nucleic acid base simultaneously across numerous frequencies and along the base-positions, through Fourier transformation and color mapping of the bases. And also, composite colored scalograms are constructed by continuous wavelet transformation to provide their individual localized time and periodic energy content in a single figure. The visualization of three-dimensional information in the forms of bases, frequencies and base-positions allows visual analysis of correlated structural and genomic information, which can hardly be obtained from the conventional character string analysis. Significant features of the studied prokaryotic genomes were revealed by the use of the programs developed. © 2006 IEEE.

关键词： Genetic engineering

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