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检索条件"任意字段=IASTED International Conference on Computer Graphics and Imaging, CGIM 2013"

共 96 条记录，以下是21-30 订阅

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Tone mapping and enhancement of high dynamic range images based on a model of visual perception

Tone mapping and enhancement of high dynamic range images ba...

引用

10th iasted international conference on computer graphics and imaging, cgim 2008

作者： Raffio, Mario Guamieri, Gabriele SIM2 Multimedia Pordenone Italy DEEI University of Trieste Trieste Italy

ISBN: (纸本)9780889867192

We present a new dynamic range compression method for the reproduction of high dynamic range digital images on conventional display devices. The proposed technique is computationally efficient and easily adjustable with few parameters. Novel contributions of this work include an edgepreserving smoother for the extraction of the visual adaptation level which avoids the formation of halo artifacts in the resulting image and a technique for contrast mapping which improves the visibility of the image details. The algorithm is finally evaluated by means of an objective measure proving its effectiveness.

关键词： Rendering (computer graphics)

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Conversion between T-splines and hierarchical B-splines

Conversion between T-splines and hierarchical B-splines

引用

Eighth iasted international conference on computer graphics and imaging, cgim 2005

作者： Wang, Yimin Zheng, Jianmin Soon Seah, Hock School of Computer Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore

ISBN: (纸本)0889865140

T-splines is a recently developed surface modelling technique which is a generalization of B-splines and allows true local refinement. Another well established method supporting local refinement is hierarchical B-splines. This paper presents algorithms for transformation between T-splines and hierarchical (rational) B-splines. With the transformation, a surface expressed in terms of T-splines can be converted into a hierarchical (rational) B-spline representation and vice versa. The correspondence between T-spline representation and hierarchical (rational) B-spline representation is generally not one-to-one. Our conversion algorithms can yield compact representations.

关键词： computer graphics

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An image inpainting method

An image inpainting method

引用

Eighth iasted international conference on computer graphics and imaging, cgim 2005

作者： Li, Bian-Ru Qi, Yue Shen, Xu-Kun School of Computer Science and Engineering BeiHang University Box 6863 No.37 XueYuan Road HaiDian District Beijing 100083 China

ISBN: (纸本)0889865140

Image inpainting technique has been widely used for reconstructing damaged old photographs and removing unwanted objects from images. In this paper, we present an image inpainting method based on the existing exemplar-based image inpainting idea. Our method improves the robustness and effectiveness by rational confidence computing method, matching strategy and filling scheme. Therefore, our method effectively prevents "growing garbage", which is a common problem in other methods. With our method, we can obtain preferable results to those obtained by other similar methods.

关键词： Image analysis

来源：评论

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The extended stereoscopic highlighting technique for node-link diagrams: An empirical study

The extended stereoscopic highlighting technique for node-li...

引用

iasted international conference on computer graphics and imaging, cgim 2013

作者： AlTarawneh, Ragaad Bauer, Jens Humayoun, Shah Rukh Keller, Patric Ebert, Achim Computer Graphics and HCI Group University of Kaiserslautern Kaiserslautern Germany Software Engineering: Dependability Group University of Kaiserslautern Kaiserslautern Germany

The stereoscopic highlighting technique is a new emerging technique that supports using the depth cue in 3D devices as a highlighting technique for general node-link representations. One of the main abilities of this technique is isolating the specific graph portions to magnify them for a detailed exploration without resorting other highlighting attributes such as color or shape. In this paper, we measure the accuracy of this technique by evaluating the ability of general users in reading the variation of depth values to encode some data aspects. To achieve this goal, we carried out a controlled user-study in which we asked users from different backgrounds to perform a specified set of tasks. The results show that using the depth cue in stereoscopic devices is readable for medium data sizes with at most three or four different layers. This can be useful in classifying the data set into a set of categories according to the depth value of the elemental layer.

关键词： Depth perception

来源：评论

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The fin Algorithm - Using subdivision methods for computer aided design and manufacturing

The fin Algorithm - Using subdivision methods for computer a...

引用

Eighth iasted international conference on computer graphics and imaging, cgim 2005

作者： Gross, Nele Technical University of Berlin Pascalstr. 8-9 10587 Berlin Germany

ISBN: (纸本)0889865140

Subdivision surfaces were first developed as an approach to generalize the patchwise quadrilateral structure of the splines to an arbitrary topological representation. They calculate a complete surface model of arbitrary topology in a global calculation step. The algorithms are based on a recursive refinement of an input mesh. The output surfaces can either be described by their limit points or as a collection of parametric patches. Sometimes these patches are however very complicated to describe and evaluate. Furthermore, subdivision algorithms tend to oscillate around extraordinary vertices. For these reasons, subdivision surfaces are not yet widely used in mechanical engineering. In this paper, the FIN algorithm which has been designed especially to meet these problems is applied to problems from manufacturing and reverse engineering. It is proven that it has considerable advantages over methods not based on a subdivision approach.

关键词： computer aided design

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Facilitating creativity in education using constructive function-based modelling

Facilitating creativity in education using constructive func...

引用

iasted international conference on computer graphics and imaging, cgim 2013

作者： Pasko, Alexander A. Adzhiev, Valery D. Malikova, Evgeniya E. Pilyugin, Victor V. NCCA The National Centre for Computer Animation Bournemouth University Poole United Kingdom National Research Nuclear University MEPhI Russia

We describe the ways in which an approach to constructive shape modelling based on the Function Representation (FRep) can be used to facilitate creative thinking in artistic and technical education. This approach assumes the use of a simple programming language or interactive software tools for creating a shape model, generating its images and finally fabricating a real object of that model. It can be considered an educational technology suitable not only for children and students but also for researchers, artists, and designers. The corresponding modelling language and software tools are being developed within an international HyperFun Project. We applied the theoretical framework and software tools on different levels of education starting from elementary schools to doctoral thesis research in various areas related to artistic design and animation, computer graphics, programming languages, software development and experimental physics. Several application case studies in various areas of art, design, and technical education from different educational institutions and countries are presented.

关键词： Modeling languages

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Geometric models and simulation techniques of human hearts: A survey

Geometric models and simulation techniques of human hearts: ...

引用

11th iasted international conference on computer graphics and imaging, cgim 2010

作者： You, L.H. Zhang, Jian J. National Centre for Computer Animation Bournemouth University Talbot Campus Poole BH12 5BB United Kingdom

ISBN: (纸本)9780889868243

Research on the understanding of heart functions using contemporary computer graphics and biomechanics has attracted an increasing attention from the research community. In this paper, we survey the recent methods on both geometric modeling and computer simulation of the human heart. We will start with an overview of the primary surface and volumetric models used in the simulation and visualization of the human heart. This will be followed by an introduction of different heart simulation techniques that include the finite element method, mesh- less method, finite volume method, and boundary element method. Finally we will discuss some future research directions.

关键词： computer simulation

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Consistent tone reproduction

Consistent tone reproduction

引用

10th iasted international conference on computer graphics and imaging, cgim 2008

作者： Kim, Min H. Kautz, Jan Department of Computer Science University College London London United Kingdom

ISBN: (纸本)9780889867192

In order to display images of high dynamic range (HDR), tone reproduction operators are usually applied that reduce the dynamic range to that of the display device. Generally, parameters need to be adjusted for each new image to achieve good results. Consistent tone reproduction across different images is therefore difficult to achieve, which is especially true for global operators and to some lesser extent also for local operators. We propose an efficient global tone reproduction method that achieves robust results across a large variety of HDR images without the need to adjust parameters. Consistency and efficiency make our method highly suitable for automated dynamic range compression, which for instance is necessary when a large number of HDR images need to be converted.

关键词： Display devices

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Texture information driven triangle mesh simplificaiton

Texture information driven triangle mesh simplificaiton

引用

Eighth iasted international conference on computer graphics and imaging, cgim 2005

作者： Xu, Aiguo Sun, Shouqian Xu, Kaiqiang College of Computer Science Zhejiang University Hangzhou China Art and Design College Hubei University of Technology Wuhan China

ISBN: (纸本)0889865140

Texture-mapped meshes are widely used in constructing 3D virtual reality environment. In this paper we propose a new algorithm for texture-mapped mesh simplification, which is the key element to accelerate the real-time rendering of 3D scenes. In contrast to previous approaches, the algorithm uses edge contraction that combines texture image frequency information distribution and texture mapping distortion energy when it computes simplification error. Experimental results illustrate that the algorithm can avoid texture triangle inversion effectively in the process of simplification and keep mesh model appearance vision properties well.

关键词： Textures

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Image registration and realignment using evolutionary algorithms with high resolution 3D models from human liver

Image registration and realignment using evolutionary algori...

引用

11th iasted international conference on computer graphics and imaging, cgim 2010

作者： Yan, Kuan Bertens, Laura Verbeek, Fons Section Imaging and Bioinfbrmatics LIACS Leiden University Niels Bohrweg 1 Leiden 2333 CA Netherlands

ISBN: (纸本)9780889868243

This paper introduces a robust solution to the realignment of high-resolution image stacks as required in the study of micro-vasculature in human liver. We discuss the design and implementation of CMA-ES alignment algorithm that provides a better and more generic solution to the realignment problem compared to existing solutions. The result of a random rigid transformation test shows that CMA-ES clearly outperforms several known solutions on both accuracy and robustness. The CMA-ES yields an accuracy of approximately 80% whilst the hierarchical chamfer matching algorithm or the Marquardt-Levenberg matching algorithm have an accuracy yield that is less than 50 %.

关键词： Three dimensional computer graphics

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