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检索条件"任意字段=12th IASTED International Conference on Computer Graphics and Imaging, CGIM 2011"

共 15 条记录，以下是1-10 订阅

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Proceedings of the 12th iasted international conference on computer graphics and imaging, cgim 2011

Proceedings of the 12th IASTED International Conference on C...

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12th iasted international conference on computer graphics and imaging, cgim 2011

ISBN: (纸本)9780889868656

the proceedings contain 17 papers. the topics discussed include: adaptive moving least squares for smoothing point clouds;figure out perspectives: perceptually realistic avatar visualization;X-Phong: extended phong lighting model for illustrative visualization;a fast knowledge-based plane reconstruction method from noisy 3D point cloud data;an efficient parallel thinning algorithm using one and two sub-iterations;multiresolution terrain generation based on implicit restricted quadtree;online authoring for augmented reality remote maintenance;realtime color adjustment for color-vision impaired users;simulation of autonomous agents using terrain reasoning;a geometric approach to improve performance of a collision detection algorithm derived from GJK and LC algorithms;and level-of-detail for time-varying surfaces on the GPU.

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Clusters in hyper-cubic multi-channel satellite imagery

Clusters in hyper-cubic multi-channel satellite imagery

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12th iasted international conference on computer graphics and imaging, cgim 2011

作者： Hawick, Kenneth A. Computer Science Institute for Information and Mathematical Sciences Massey University North Shore 102-904 Auckland New Zealand

ISBN: (纸本)9780889868656

Multi-spectral remotely-sensed data such as satellite imagery can yield excellent insights into complex phenomena such as weather systems. Analysing the multi-channel space to separate out different features still presents a challenge, which may increase with the availability of hyperspectral satellites. We use component labelling and population thresholding techniques to separate out clusters in hyper-dimensional channel space and use this information to identify different cloud types in geostationary satellite imagery. three dimensional visualisation techniques are used to study the hyper-dimensional channel population data.

关键词： Remote sensing

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A geometric approach to improve performance of a collision detection algorithm derived from GJK and LC algorithms

A geometric approach to improve performance of a collision d...

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12th iasted international conference on computer graphics and imaging, cgim 2011

作者： Maris, Bogdan Botturi, Debora Fiorini, Paolo Department of Computer Science University of Verona Verona Italy

ISBN: (纸本)9780889868656

We present a fast algorithm for collision detection and for distance computation between two convex objects in 3D. the algorithm is an optimization of Gilbert, Johnson and Keerthi algorithm (GJK) and uses a geometrical approach through the Voronoi regions to detect the closest features, as described in Lin and Canny algorithm (LC). the main contributions of this work are the simplification of each iteration of the GJK algorithm by substituting the computation of the closest point with the identification of the closest feature to the origin and a clear geometric representation and implementation of every iteration. By using the Voronoi regions, together with the above simplification of the calculus, we increase the robustness of the algorithm and we give a deeper understanding of the inner steps. the paper presents a complete description of the proposed procedure showing the approach quality.

关键词： Iterative methods

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Figure out perspectives: Perceptually realistic avatar visualization

Figure out perspectives: Perceptually realistic avatar visua...

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12th iasted international conference on computer graphics and imaging, cgim 2011

作者： Jan, Wojdziak Zavesky, Martin Kusch, Kerstin Wuttig, Daniel Franke, Ingmar S. Groh, Rainer Technische Universität Dresden Department of Computer Science Institute of Software and Multimedia Technology Dresden Germany

ISBN: (纸本)9780889868656

Projection of three-dimensional space onto a two-dimensional surface relies on the computer graphics camera based in design on the camera obscura. Geometrical limitations of this model lead to perspective distortions in wide-angle projections. Including the camera model, our approach is to involve the human perception in order to create a realistic spatial impression by a two-dimensional image. this paper discusses the influence of multi-perspective on three-dimensional computer graphics in virtual worlds based on the rules of perspective projection enhanced by characteristics of visual perception and techniques of Renaissance painting. the aim is to provide human-centered interfaces for an efficient and coherent communication of spatial information in virtual worlds to support avatar-mediated interaction with its need for correct depiction of human figures concerning proportion and orientation. To this end, we explain an object-based and introduce a camera-based computer graphics procedure to prevent projective distortions and misalignments.

关键词： three dimensional computer graphics

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X-Phong: Extended phong lighting model for illustrative visualization

X-Phong: Extended phong lighting model for illustrative visu...

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12th iasted international conference on computer graphics and imaging, cgim 2011

作者： Xu, Xiang Seah, Hock Soon Qian, Kemao School of Computer Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore

ISBN: (纸本)9780889868656

In illustrative field, computer generated line drawings do not achieve the same level of sophistication as hand-drawn illustrations. In this paper, a lighting model is presented that attempts to enhance the shape depiction of 3D objects. the model, called X-Phong lighting model, extends the basic Phong lighting model with curvature light to control the perceived shape and line detail. X-Phong Lines (XPLs), which are generated based on the lighting model, are more flexible to achieve desirable visualization effect compared with the existing approaches. In addition, XPLs characterize more significant variations of illumination on 3D surfaces. We apply the proposed XPLs to a wide range of real-world models, and demonstrate through qualitative and quantitative evaluations that XPL is a flexible and effective tool for illustrations.

关键词： Lighting

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Fast inter-mode decision algorithm using efficient hierarchical structure in H.264/AVC

Fast inter-mode decision algorithm using efficient hierarchi...

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12th iasted international conference on computer graphics and imaging, cgim 2011

作者： Kim, Joohyeok Jo, Youngsub Lee, Won-Jin Jeong, Jechang Department of Electronics and Computer Engineering Hanyang University 17 Haengdang-dong Seongdong-gu Seoul Korea Republic of

ISBN: (纸本)9780889868656

In this paper, we propose new two techniques to reduce computational complexity of mode decision process in H.264/AVC encoder. Inter mode decision process for all the seven block-sizes needs significant time consumption but the adoption of our sequential mode skip algorithm in mode decision efficiently solves the problem related to timing burden. First, we detect macroblock that best mode is 16×8 block size mode using the information of rate distortion cost of other modes. Second, we skip unnecessary 8×8 block size mode calculation. In this case, 8×8 block size mode is skipped by using two methods which is related to the existence of 16×8 block size mode. Simulation results demonstrate that the proposed mode decision algorithm reduces about 50% of total encoding time of whole sequence with ignorable degradation of coding performance.

关键词： Electric distortion

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Simulation of autonomous agents using terrain reasoning

Simulation of autonomous agents using terrain reasoning

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12th iasted international conference on computer graphics and imaging, cgim 2011

作者： Cassol, Vinícius J. Marson, Fernando P. Vendramini, Mateus Paravisi, Marcelo Musse, Soraia R. Bicho, Alessandro L. Jung, Cláudio R. Graduate Programme in Computer Science PUCRS Porto Alegre - RS Brazil Center of Computational Sciences FURG Rio Grande - RS Brazil Institute of Informatics UFRGS Porto Alegre - RS Brazil

ISBN: (纸本)9780889868656

the representation of a real scenario through a 3D virtual environment populated by autonomous agents has several applications, such as games or animation movies. Such representation can be a difficult and complex task, since natural scenarios are composed by forms with a lot of details that should be reproduced realistically in the virtual world. Moreover, virtual people should understand and consider the virtual world for navigation similarly to real people. In this paper we describe a model to provide motion of groups of characters based on terrain reasoning in 3D virtual worlds. the model starts with the terrain generation process using height maps in a pseudo-infinite world, followed by the simulation of characters movement generated through an space colonization algorithm. Finally, the visualization of characters motion in the 3D terrain can be produced.

关键词： Autonomous agents

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Geometric models and simulation techniques of human hearts: A survey

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

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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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Single image based illumination estimation for lighting virtual object in real scene

Single image based illumination estimation for lighting virt...

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12th international conference on computer-Aided Design and computer graphics, CAD/graphics 2011

作者： Chen, Xiaowu Wang, Ke Jin, Xin State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9780769544977

Rendering virtual objects into real scenes with real illumination can greatly increase the realism of virtual objects and the consistency between the virtual and the real. the main challenge lies in illumination estimation from a single image. this article proposes a novel method of single image based illumination estimation for lighting virtual object in real scene. Only a single image, without any knowledge of the 3D geometry or reflectance, is needed, which greatly increases the applicability of the method. We first estimate coarse scene geometry and intrinsic components including shading image and reflectance image. then the sparse radiance map of the scene is inferred based on the scene geometry and intrinsic components. Finally, the virtual objects are illuminated by the estimated sparse radiance map. Some experimental results show that this method can convincingly light virtual objects into a single real image, without any pre-recorded 3D geometry and reflectance, illumination acquisition equipments or imaging information of the image. © 2011 IEEE.

关键词： Geometry

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Fully Convolutional Crowd Counting on Highly Congested Scenes 12

Fully Convolutional Crowd Counting on Highly Congested Scene...

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12th international Joint conference on computer Vision, imaging and computer graphics theory and Applications (VISIGRAPP)

作者： Marsden, Mark McGuinness, Kevin Little, Suzanne O'Connor, Noel E. Dublin City Univ Insight Ctr Data Analyt Dublin Ireland

ISBN: (纸本)9789897582264

In this paper we advance the state-of-the-art for crowd counting in high density scenes by further exploring the idea of a fully convolutional crowd counting model introduced by (Zhang et al., 2016). Producing an accurate and robust crowd count estimator using computer vision techniques has attracted significant research interest in recent years. Applications for crowd counting systems exist in many diverse areas including city planning, retail, and of course general public safety. Developing a highly generalised counting model that can be deployed in any surveillance scenario with any camera perspective is the key objective for research in this area. Techniques developed in the past have generally performed poorly in highly congested scenes with several thousands of people in frame (Rodriguez et al., 2011). Our approach, influenced by the work of (Zhang et al., 2016), consists of the following contributions: (1) A training set augmentation scheme that minimises redundancy among training samples to improve model generalisation and overall counting performance;(2) a deep, single column, fully convolutional network (FCN) architecture;(3) a multi-scale averaging step during inference. the developed technique can analyse images of any resolution or aspect ratio and achieves state-of-the-art counting performance on the Shanghaitech Part_B and UCF_CC_50 datasets as well as competitive performance on Shanghaitech Part_A.

关键词： computer Vision Crowd Counting Deep Learning

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