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检索条件"任意字段=12th International Conference on Computer-Aided Design and Computer Graphics, CAD/Graphics 2011"

共 163 条记录，以下是101-110 订阅

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Automatic Compositing Soccer Video Highlights with Core-Around Event Model

Automatic Compositing Soccer Video Highlights with Core-Arou...

引用

IEEE international conference on computer-aided design and computer graphics

作者： Kai Jiang Xiaowu Chen Qinping Zhao State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University Beijing China

this paper presents an automatic video highlighting approach in relation to a soccer match video lasting over ninety minutes, in which only the match video and the target length of the highlight video are required for the composition. Firstly, we propose a core-around event model, which represents the highlight as a complex event and consists of three components: semantic relations, temporal relationship among the activities and local motion appearance of each activity. Secondly, we detect activities involved in a highlight in the soccer match video by the local motion appearance. thirdly, a candidate highlight video segment is aligned with the model by a specific kernel activity extracted on the basis of the semantic relations, and then assigned a matching score. Finally, we splice together the highlight segments of high matching score. Experimental results demonstrate that the composed highlight videos are attractive episodes of soccer matches, and similar to those edited by professional editors.

关键词： Semantics Motion segmentation Visualization Training Humans Kernel Video sequences

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Application of Pen-Based Planar Haptic Interface in Physics Education

Application of Pen-Based Planar Haptic Interface in Physics ...

引用

IEEE international conference on computer-aided design and computer graphics

作者： Liping Lin Yongtian Wang Yue Liu Makoto Sato School of Computer Science and Technology Beijing Institute of Technology BIT Beijing China School of Optics and Electronics Beijing Institute of Technology BIT Beijing China Precision and Intelligence Laboratory Tokyo Institute of Technology Yokohama Japan

this paper proposes a pen-based interaction system with 2D co-located haptic and visual feedback for physics education. the system combines a 3DOF pen-based planar haptic device and simulated 2D physical world based on physical engine Box 2D and 2D game engine HGE. the inputs of haptic device are translation and rotation of pen tip and the outputs are translational and rotational force displayed at pen tip. In addition, visual display and haptic display are coincident and well integrated. With this system, user can create and design simulated physical world by drawing, selecting, moving or rotating objects on screen and setting their physical properties in a natural and intuitive way. this system provides an entertaining and cartoony tool for designing and carrying out physics experiments, and will greatly promote students' learning interest and creativity.

关键词： Haptic interfaces Physics education Engines Games computers Force

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An Accurate and Practical Camera Lens Model for Rendering Realistic Lens Effects

An Accurate and Practical Camera Lens Model for Rendering Re...

引用

IEEE international conference on computer-aided design and computer graphics

作者： Jiaze Wu Changwen Zheng Xiaohui Hu Chao Li Graduate University of Chinese Academy of Sciences China National Key Laboratory of Integrated Information System Technology Institute of Software Chinese Academy of Sciences (CAS) China

In this paper, an accurate and practical camera lens model is proposed to be applied in realistic rendering of lens-related effects. the optical modeling of this new model is firstly presented from two aspects: lens surface modeling and formulation of ray tracing equations. then, a number of tunable models for controlling lens properties are introduced and combined together to determine overall imaging performance. An implementation framework for this lens model is presented from two important aspects: its internal working framework and a new rendering pipeline for integrating it into a general ray tracer. In contrast to existing lens models, this new one is characterized by its ability to accurately model the image formation process and its friendly tunable models to control its lens properties. As a consequence, it is capable of simulating complex lens-related effects without too much expertise on lens optics. Finally, multiple rendering experiments are performed to demonstrate the ability and usage of this novel model to simulate a variety of complex lens-related effects.

关键词： Lenses Mathematical model Solid modeling Rendering (computer graphics) Ray tracing Optical imaging Equations

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A Residential Building Reconstruction Method and Its Evaluation

A Residential Building Reconstruction Method and Its Evaluat...

引用

IEEE international conference on computer-aided design and computer graphics

作者： Ye Yu Xiaoping Liu Bill P. Buckles School of Computer and Information Hefei University of Technology Hefei China Department of Computer Science and Engineering University of North Texas (UNT) Denton TX USA

A novel method for three-dimensional (3D) residential building reconstruction in urban areas using LiDAR (light detection and ranging) data is proposed. the main contribution of this work is the automatic segmentation of roof points and roof type recognition and reconstruction based on sparse LiDAR data. Using minimum bounding rectangle (MBR) method and model-based reconstruction, we are able to automatically identify individual buildings from cluttered residential areas and re-create building models with improved accuracy in a reasonably short time. We applied our method to urban sites in the city of New Orleans and demonstrated that the method identified building measurements successfully from LiDAR data and rebuilt 3D models effectively. Our experiments show that even in the presence of noise we can successfully reconstruct small buildings given relatively sparse LiDAR samples with help from template databases.

关键词： Buildings Laser radar Image reconstruction Solid modeling Reconstruction algorithms Accuracy Computational modeling

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SIMD Friendly Ray Tracing on GPU

SIMD Friendly Ray Tracing on GPU

引用

IEEE international conference on computer-aided design and computer graphics

作者： Peng Zhou Xiangxu Meng Department of Computer Science Shandong Provincial Key Laboratory of Software Engineering Shandong University Jinan China

In this paper, we present a novel BVH tracing method on GPU, which can achieve better SIMD utilization than traditional method. In the traditional way, thread usually sticks to a ray until the closest hit is found. When the threads of the same warp follow very divergent ray paths, SIMD utilization drops significantly. the idea of our method is to redefine the way of work distribution by binding the ray and the data to be tested together, in order to spread the computation of the single ray to multi threads. We also separate the tracing process into three steps to collect the work units of the same type and process them in a stream-like manner. the first step is ray traversal whose task is to do ray-box testing for the ray-node pairs. Its output is an stack of ray-triangle pairs, which is then fed to intersecting step to form an stack of ray-hit pairs. the last step is to use ray-hit pairs to update the closest hits for each ray of the same warp. the experiment shows our method can efficiently improve the SIMD utilization and result in less tracing time.

关键词： Arrays graphics processing unit Instruction sets Indexes Kernel Ray tracing Sorting

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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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IEEE international conference on computer-aided design and computer graphics

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

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.

关键词： Lighting Geometry Estimation three dimensional displays Light sources Solid modeling Sun

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Multi-resolution Mesh Fitting by B-spline Surfaces for Reverse Engineering

Multi-resolution Mesh Fitting by B-spline Surfaces for Rever...

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IEEE international conference on computer-aided design and computer graphics

作者： Sen Zhang Zhigang Li Hui Zhang Junhai Yong Tsinghua University Beijing Beijing CN Key Laboratory for Information System Security Ministry of Education Beijing China School of Software Tsinghua University Beijing China Tsinghua National Laboratory for Information Science and Technology Beijing China

this paper presents a new multi-resolution mesh fitting algorithm, extending the adaptive patch-based fitting scheme where each underlying quadrilateral is recursively subdivided into four sub-patches. In this paper, the G 1 continuity constraints, which mainly consist of perpendicular constraints and twist compatibility constraints, are deduced for B-spline patches. In order to construct a unique B-spline patch for each quadrilateral, the mesh vertices are applied in a least-square approximation, and the energy functions associated with a patch are minimized. In contrast to the original algorithm, this paper fits the mesh into B-spline patches instead of Bezier patches with G 1 continuity. the B-spline patches make the algorithm have more free control points to be used for optimizing the shape of the quadrilateral patches to achieve higher flexible patch control and less recursive times.

关键词： Spline Vectors Surface treatment Shape Adaptation models Equations design automation

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A Hierarchical Approach to 3D Scattered Data Interpolation with Radial Basis Functions

A Hierarchical Approach to 3D Scattered Data Interpolation w...

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IEEE international conference on computer-aided design and computer graphics

作者： Xinwei Du Xiangjiu Che College of Mathematics Jilin University ChangChun CHINA College of Computer Science and Technology Jilin University ChangChun CHINA

Based on globally supported radial basis functions, this paper presents a hierarchical approach to 3D scattered data interpolation. Given a scattered data set distributed along a surface, we first obtain a sparse approximation of the scattered data set by filtering the scattered data with two different steps, and identify the characteristic points by the measurements of bounding cube and the distance between the points and the interpolating surface. then using multi-level hierarchy of point sets, the accuracy of interpolating surface can be gradually improved. On the basis of effective selection of the off-surface normal points, the number of constraint conditions is reduced, and trivial solutions of the interpolating equations can be avoided. Above all, we can identify the characteristic points in the model with less data points, and obtain interpolating surface with higher fitting accuracy by solving equations with lower order. the numerical experiments show that the method is more efficient and easy to implement.

关键词： Interpolation Surface reconstruction Equations Approximation algorithms Accuracy three dimensional displays

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An Interactive 3D Preoperative Planning and Training System for Minimally Invasive Vascular Surgery

An Interactive 3D Preoperative Planning and Training System ...

引用

IEEE international conference on computer-aided design and computer graphics

作者： Dongjin Huang Wen Tang Youdong Ding Taoruan Wan Yimin Chen School of Computer Engineering and Science Shanghai University Shanghai China School of Computing University of Teesside Middlesbrough UK School of Film and TV Arts Technology Shanghai University Shanghai China School of Informatics University of Bradford Bradford UK

Virtual reality based preoperative planning for Minimally Invasive Vascular Intervention is useful, not only for increasing the success rate of operation, but also used as a training tool for improving doctors' skills. In this paper we present an interactive 3D preoperative planning and training system with haptic device. In this system, we present an intelligent trajectory planning algorithm for searching an optimal path automatically along the centerline in two ways: from the suitable inserting point to the specific target location or to the most of objectives. Also, for the purpose of interactive training, we connect the haptic device to the end of guide wire and propose an algorithm that enables the simulator to model guide wire and catheter insertions realistically through essential operations i.e. pushing, pulling and twisting actions. We demonstrate experiment results to show that the 3D preoperative planning and training system is usable for simulating guide wire insertion procedures with complex blood vessel structures.

关键词： Planning Blood vessels Biomedical imaging Training Haptic interfaces Surgery

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An Optimal Color Mapping Strategy Based on Energy Minimization for Time-Varying Data

An Optimal Color Mapping Strategy Based on Energy Minimizati...

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IEEE international conference on computer-aided design and computer graphics

作者： Yi Peng Jie Dong Li Chen Haiyang Chu Junhai Yong Key Laboratory for Information System Security Ministry of Education Beijing China Department of Computer Science and Technology Tsinghua University Beijing China Tsinghua National Laboratory for Information Science and Technology Beijing China School of Software Tsinghua University Beijing China

Color mapping plays a critical role in visualization of time-varying data and also sets a challenge for researchers due to the consistency of mapping and great changes in time-varying data. In order to solve this problem and generate feature-prominent animation, we present a two phase optimization technique using bilateral filtering and global energy functions. In the first phase, for each time step, we use a weighted mapping function which combines linear mapping and feature histogram. In the second phase, an optimization function taking global color mapping and minimum color difference into consideration is designed. So users can clearly distinguish between data in variable time steps and easily understand the corresponding relationships between different structures. the experiments' results show that our method can achieve high quality visualization for both static and time-varying data.

关键词： Image color analysis Data visualization Optimization Correlation Minimization Transfer functions Histograms

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