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检索条件"任意字段=Conference on Computer Graphics, Imaging and Visualisation"

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Stretch it - Realistic smooth skinning

Stretch it - Realistic smooth skinning

引用

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

作者： Yang, Xiaosong Zhang, Jian J. National Centre for Computer Animation Bournemouth Media School Bournemouth University United Kingdom

ISBN: (纸本)0769526063

Smooth Skinning is still the most popular method for the animation of deformable human and creature characters. It has became almost an industry standard because of its intuitiveness to use and efficiency to compute. However it suffers from a number of problems, such as the collapsing elbow and candywrapper effect. In this paper, we present a new method, which is able to solve these defects with very little extra stretching computations. The advantage of this method is its compatibility with the current animation workflow. The animator can change the skin weight any way they like and therefore it favours creativity. The aim of our method is trying to retain the realism and computational efficiency at the same time. It is suitable for situations, where real time response is necessary, like computer games. A practical implementation in the form of a Maya plug-in is created to demonstrate the viability of the method. © 2006 IEEE.

关键词： computer graphics

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A novel approach for surface to surface intersection approximation

A novel approach for surface to surface intersection approxi...

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2013 17th International conference on Information visualisation, IV 2013

作者： Sarfraz, Muhammad Irshad, Misbah Sarfraz, Faiza Hussain, Malik Zawwar Department of Information Science Kuwait University Kuwait Department of Mathematics University of the Punjab Lahore Pakistan

A new technique for approximating intersection curves of two parametric surfaces is presented, which extracts boundary points and turning points from a sequence of intersection points and interpolate them with the hel... 详细信息

ISBN: (纸本)9780769550497

关键词： computer graphics

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Incremental voxel colouring by ray traversal

Incremental voxel colouring by ray traversal

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

作者： Batchelor, O. Mukundan, R. Green, R. University of Canterbury Dept. Computer Scienceand Software Engineering

ISBN: (纸本)0769526063

Image based reconstruction from multiple views is an interesting challenge. Recently methods of optimisation based voxel colouring have appeared, which make use of incremental visibility updates. We present an alternative incremental voxel colouring algorithm in the mould of GVC-LDI [2] which directly associates each visible voxel with the set of rays in it's visible projection, using ray-voxel traversal as a mechanism for updates. We make some time comparisons using calibrated photographs and synthetic images, as well looking at optimisation based voxel colouring and level of detail. Results show that our method compares favourably to GVC-LDI. © 2006 IEEE.

关键词： Image reconstruction

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Challenges to the ubiquity of perspective since the photograph: an essay on alternatives and alterations 22

Challenges to the ubiquity of perspective since the photogra...

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22nd International conference Information visualisation (IV) - Biomedical Visualization, visualisation on Built and Rural Environments and Geometric Modelling and imaging

作者： Wyeld, Theodor Flinders Univ S Australia Adelaide SA Australia

ISBN: (纸本)9781538672020

The perspective image, first formularized in the fourteenth century Italian Renaissance, was chemically automated by the photograph in the mid-nineteenth century. While at its zenith, the Dutch realists had achieved astonishingly mimetic reproduction of the visual world in their paintings, the photograph threatened to automate and commodify their work. The unerring catch-all monotony of the scenes depicted in early photography also questioned the value artists invested in what they included in their paintings. As such, many artists rejected the photograph, and perspective realisms more generally. From the mid-nineteen century to the late twentieth century, many challenges to the verisimilitudinal nature of the photograph and perspective image were mounted. These ranged from impressionist patches of light and dark, patches of colour, compression of space to the surface of the painting, layering of multiple temporal images in a single frame, to the complete voiding of spatial references altogether. Their campaigns waged across the twentieth century, computer graphics (CG) has since reestablished the perspective image as a dominant media. However, CGs too has its alternatives and alterations which generate new effects, both extending and challenging its presumed norms. This paper is a brief essay about the cycle that has been the dominance, decline and reemergence of the perspective image since the Renaissance.

关键词： Renaissance Perspective Photograph computer graphics Impressionists Abstract Expressionists Cubists

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VIML: Toward future video visualization and interaction

VIML: Toward future video visualization and interaction

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

作者： Jin, Jesse Department of Information Technology School of Design Communication and I.T. University of Newcastle Callaghan NSW 2308 Australia Department of IT School of Design Communication and IT University of Newcastle Motorola Computer Associates ScanWorld Proteome Systems HyperSoft

ISBN: (纸本)0769526063

There is an increasing demand for the interaction between users and video streams. One example is the digital TV which will be popular in two years time. The advantage of digital TV is the interactivity it can do, not merely for a good picture. Users have a need to bring up the menu/summary page and go to relevant video streams, or alter the view in a special way. Another example is watching video in distance education scenario. There is a need to collect feedback from users and restructure the video presentation based on different responses. Video contains rich information. However, due to the organization of digital video streams, it is difficult to use hyperlinks similar to HTML links in Web pages. Video does not have the same hierarchical structure and organization as text. Video bits are meaningless by themselves. The interactive information is difficult to be built in and retrieved from video data. There is also a synchronization problem of video and associated text. In streaming video over the Internet, there is a visualization problem, ie, how to provide an efficient representation of the entire video stream. There are few attempts to explore and standardize video interactions, which include Micorsoft SMIL, UC Berkeley BIBS, IPMP in MPEG 4 and various descriptors in MPEG 7. This talk will discuss the current progress in video visualization and interaction and present some novel ideas and directions in the area. In particular, we will discuss video cataloguing and summarization, video streaming using semantic hierarchy, video play and interaction, video interaction mark-up language (VIML) and software based special video effect and dynamic post-production of video steams. © 2006 IEEE.

关键词： Interactive computer graphics

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computer aided indexing of historical manuscripts

Computer aided indexing of historical manuscripts

引用

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

作者： Shahab, S.A. Al-Khatib, Wasfi G. Mahmoud, Sabri A. Information and Computer Science Department King Fahd University of Petroleum and Minerals Dhahran 31261 Saudi Arabia

ISBN: (纸本)0769526063

Arabie manuscripts represent a rich source of knowledge that has been highly underutilized. Huge repositories of historical artifacts are yet to be typeset and published in book-form. Given vast content of these manuscripts, it is important to develop indexing systems that support contentbased retrieval from historical manuscripts. In this paper, we propose a computer aided retrieval and indexing system for Arabic historical manuscripts. The proposed system extracts meaningful information (features) that is used in indexing. Some preprocessing steps are also implemented in order to enhance the quality of document images. More than one form of a similarity measure has been tested. The developed prototype system has shown encouraging results with respect to the word matching rates achieved. © 2006 IEEE.

关键词： computer aided design

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The Impacts of Animated-Virtual Actors' Visual Complexity and Simulator Sickness in Virtual Reality Applications

The Impacts of Animated-Virtual Actors' Visual Complexity an...

引用

6th International conference on computer graphics, imaging and Visualization (CGIV 2009)

作者： Kartiko, Iwan Kavakli, Manolya Cheng, Ken Macquarie Univ Dept Comp VISOR Res Grp Sydney NSW 2109 Australia Macquarie Univ Dept Brain Behav & Evolut Sydney NSW Australia

ISBN: (纸本)9780769537894

This article discusses the effects of Animated Virtual Actors' (AVAs) visual complexity on Simulator Sickness (SS) in Virtual Reality (VR) applications. SS is one of the major disadvantages of VR simulations. Previous research has shown that visual complexity correlates with SS. Yet complex AVAs are increasingly used along with real-time graphics. Minimising SS for a VR application is thus beneficial. A series of VR simulations were created to teach second-year psychology students about the navigational capabilities of desert ants with different levels of AVA's visual complexity: flat, cartoon, or lifelike. We predicted that more complex AVAs would induce more SS. The results contradicted the predictions, with no significant differences in SS between groups as a function of the AVAs visual complexity. Moreover, our methods succeeded in low overall levels of SS in all the simulations. Possible explanations and our future research directions are discussed.

关键词： virtual actors virtual reality visual complexity simulation sickness visualisation

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An effective stratified sampling scheme for environment maps with median cut method

An effective stratified sampling scheme for environment maps...

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

作者： Xing, Mei Jaeger, Marc Baogang, Hu LIAMA/NLPR Institute of Automation Chinese Academy of Sciences Beijing China Laboratoire AMAP CIRAD Montpellier France

ISBN: (纸本)0769526063

Environment maps are extensively used as natural light sources in realistic rendering. We propose a stratified sampling scheme for environment maps by first stratifying the maps into a set of rectangular regions with Median Cut method, then estimating the contribution of the regions with Monte Carlo integration techniques. In this way, illumination, surface reflectance and spatial distribution are all taken into consideration for the generation of the light samples. Compared with the existing biased lighting techniques, the presented scheme produces unbiased rendering results with less noise and better shadow boundaries, particularly at low sampling rates. The proposed spatial distribution of the samples also helps to overcome the sample-clumping problem in traditional illumination-based importance sampling method. Experimental results indicate that the scheme is fast, simple to implement and effective. © 2006 IEEE.

关键词： computer graphics

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Skeleton Based 3D Model Morphing Using Barycentric Map

Skeleton Based 3D Model Morphing Using <i>Barycentric</i> Ma...

引用

5th International conference on computer graphics, imaging and Visualization (CGIV)

作者： Kaneko, Kosuke Okada, Yoshihiro Kyushu Univ Grad Sch Informat Sci & Elect Engn Nishi Ku Fukuoka 8190395 Japan

ISBN: (纸本)9780769533599

This paper proposes a skeleton based 3D model morphing system using Barycentric map. Although there have been many 3D model morphing systems, even it is still laborious to perform the 3D model morphing because it needs many manual operations. The most important task for the morphing is the vertex correspondence between two base models. When the vertex numbers and geometric topologies of two models are different, its 3D model morphing is difficult. For overcoming this problem, the proposed system automatically determines the vertex correspondence based on skeletons of two models. The overview of proposed processes is as follows: first of all, the user segments each of two models manually. Then the system generates bones of the each model based on the above segmentation. Next, the system defines the hierarchy of generated bones to generate the skeleton of the each model and then determines the correspondence between two bones of the two models based on the hierarchical structure's of their skeletons. Finally, the system defines vertex correspondences between the No models using Barycentric mapping, Then the 3D model morphing between the two models will become possible. These processes except the first segmentation step are automatic.

关键词： Polygonal model Morphing Segmentation Skeleton computer graphics

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Flexible tracking of object contours using LR-traversing algorithm

Flexible tracking of object contours using LR-traversing alg...

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

作者： Apu, Russel Ahmed Gavrilova, Marina L. Department of Computer Science University of Calgary

ISBN: (纸本)0769526063

Tracing the contour of an object in an image is an important problem in computer vision. This paper presents a new contour detection algorithm using an adaptive vision framework. The proposed method is different from conventional algorithms in several ways. First, we introduce a new adaptive tracking algorithm called LR-traversing. LR-traversing is unique as it progressively adapts to the thickness of an edge while tracking the contour of an object with variable sharpness. Secondly, the method employs adaptive selection process that can optimally extract features based on an error metric. By utilizing this flexible run-time technique our method can detect and track object contours in real-time. Experiments demonstrate that the method is significantly faster than other algorithms that can achieve similar result. © 2006 IEEE.

关键词： Object recognition

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