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Efficient region-selective subdivision for 3-D meshes

Efficient region-selective subdivision for 3-D meshes

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Asilomar conference on Signals, Systems & computers

作者： Wenlong Dong Jiankun Li C.-C.J. Kuo Integrated Media Systems Center and Department of Electrical Engineering-Systems University of Southern California Los Angeles CA USA

An efficient region-selective subdivision algorithm for 3-D meshes is proposed in this research, The use of subdivision surfaces for constructing and representing 3-D objects has been introduced in computer graphics and related fields. As an interpolating subdivision scheme on triangular meshes, the modified butterfly subdivision (MBS) algorithm is feasible for many applications such as progressive rendering and object shape-preserving. To further improve MBS, we adopt efficient refinement criteria based on the viewing frustum, the surface orientation, the screen-space visibility error and the local mesh flatness. We also provide a set of subdivision rules to model some natural sharp features such as local creases, cusps and darts. By choosing appropriate edges as being sharp, the refined meshes attain desired sharp features in edge regions, while maintaining the same order of smoothness as other subdivision algorithms elsewhere.

关键词： computer graphics Topology Rendering (computer graphics) Solid modeling Visualization Shape

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Dynamic PDE surfaces with flexible and general geometric constraints

Dynamic PDE surfaces with flexible and general geometric con...

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pacific conference on computer graphics and applications

作者： Haixia Du Hong Qin Department of Computer Science State University of New York Stony Brook Stony Brook NY USA

ISBN: (纸本)0769508685

PDE surfaces, whose behavior is governed by partial differential equations (PDEs), have demonstrated many modeling advantages in surface blending, free-form surface modeling, and surface aesthetic or functional specifications. Although PDE surfaces can potentially unify geometric attributes and functional constraints for surface design, current PDE based techniques exhibit certain difficulties such as the restrained topological structure of modeled objects and the lack of interactive editing functionalities. We propose an integrated approach and develop a set of algorithms that augment conventional PDE surfaces with material properties and dynamic behavior. The authors incorporate PDE surfaces into the powerful physics based framework, aiming to realize the full potential of the PDE methodology. We have implemented a prototype software environment that can offer users a wide array of PDE surfaces with flexible topology (through trimming and joining operations) as well as generalized boundary constraints. Using our system, designers can dynamically manipulate PDE surfaces at arbitrary location with applied forces. Our sculpting toolkits allow users to interactively modify arbitrary point, curve span, and/or region of interest throughout the entire PDE surface in an intuitive and predictable way. To achieve real time sculpting, we employ several simple, yet efficient numerical techniques such as finite difference discretization, multi-grid subdivision, and FEM approximation. Our experiments demonstrate many advantages of physics based PDE formulation such as intuitive control, real time feedback, and usability to both professional and non-expert users.

关键词： Differential equations Solid modeling computer aided manufacturing CADCAM Shape control computer science Partial differential equations Material properties Software prototyping Topology

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GPU Acceleration of the Horizontal Diffusion Method in the Weather Research and Forecasting (WRF) Model

GPU Acceleration of the Horizontal Diffusion Method in the W...

引用

Asia-pacific conference on computer Aided System Engineering (APCASE)

作者： Ronald M. Gualán-Saavedra Lizandro D. Solano-Quinde Brett M. Bode Department of Electrical Electronic and Telecommunications Engineering University of Cuenca Ecuador National Center for Supercomputing Applications University of Illinois USA

The Weather Research and Forecasting (WRF) is a next-generation mesoscale numerical weather prediction system. It is designed with a dual purpose, forecasting and research. The WRF software infrastructure consists of a number of components such as dynamic solvers and physical simulation modules. Dynamic solvers are intensive computational components of the WRF model. In this paper, the Horizontal Diffusion method, which is part of the ARW (Advanced Research WRF) dynamic solver, is accelerated using GPUs. The performance of the GPU-based method was compared to that one of a CPU-based single-threaded counterpart on a computational domain of 433x308 horizontal grid points with 35 vertical levels. Thus, the achieved speedup is 19x on a NVIDIA Tesla M2090, without considering data I/O.

关键词： graphics processing units Acceleration Computational modeling Runtime Optimization Instruction sets Meteorology

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GAIN: GPU-Based Constraint Checking for Context Consistency

GAIN: GPU-Based Constraint Checking for Context Consistency

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Asia-pacific conference on Software Engineering

作者： Jun Sui Chang Xu Wang Xi Yanyan Jiang Chun Cao Xiaoxin Ma Jian Lu Nanjing University Nanjing Jiangsu CN Department of Computer Science and Technology Nanjing University Nanjing China

ISBN: (纸本)9781479974276

applications in pervasive computing are often context-aware. However, due to uncontrollable environmental noises, contexts collected by applications can be distorted or even conflicting with each other. This is known as the context inconsistency problem. To provide reliable services, applications need to validate contexts before using them. One promising approach is to check contexts against consistency constraints at the runtime of applications. However, this can bring heavy computations due to tremendous amounts of contexts, thus leading to deteriorated performance to applications. Previous work has proposed incremental or concurrent checking techniques to improve the checking performance, but they heavily rely on CPU computing. In this paper, we propose a novel technique GAIN to exploit GPU computing to improve the checking performance. GAIN can automatically recognize parallel units in a constraint and schedule their checking in parallel on GPU cores. We evaluated GAIN with various constraints under different workloads. Our evaluation results show that, compared to CPU-based computing, GAIN saves CPU computing resources for pervasive applications while checks constraints much more efficiently.

关键词： Context graphics processing units Runtime Arrays Instruction sets Parallel processing Syntactics

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3D VR Engine

3D VR Engine

引用

International conference on High Performance Computing in the Asia-pacific Region

作者： Horng-Shyang Liao Bo-Yin Li C.H. Chang San-Liang Chu Information Technology Division National Center of High-performance Computing Hsinchu Taiwan

High-performance computing (HPC) has caused the data size for the simulation models increasingly larger everyday. Consequently the resulting data grow as well. This makes the visualization tasks demand HPC power too. At NCHC, this issue of visualizing large data set has incurred since the end of 90s. So we started to design the tool sets for large data visualization in 2002. 3D VR Engine is an object-oriented toolkit for developing interactive virtual reality applications. It includes eight features, stereo display, discrete level-of-detail (LOD), large data set, tile texture (Blythe, 1999), 3D true type fonts, XML scene description language, user specified key binding, voxel projection volume rendering. It also includes some basic graphics algorithms, such as vector, matrix, bounding box, and several geometric object loaders and many image readers. Based on this toolkit, we can develop visualization and virtual reality applications relatively easily in a short period of time. This paper discusses the architecture and some modules.

关键词： Virtual reality Engines Data visualization Object oriented modeling Computational modeling Three dimensional displays Tiles XML Layout Rendering (computer graphics)

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Data memory minimization by sharing large size buffers

Data memory minimization by sharing large size buffers

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Asia and South pacific Design Automation conference

作者： Hyunok Oh Soonhoi Ha The Department of Computer Engineering Seoul National University South Korea

ISBN: (纸本)0780359739

This paper presents software synthesis techniques to deal with non-primitive data type from graphical dataflow programs based on the synchronous dataflow (SDF) model. Non-primitive data types, often used in multimedia and graphics applications, require buffer memory of large size. To minimize the buffer requirement, we separate global data buffers and local pointer buffers. The proposed approach first allocates the minimum size of global buffers and next binds the local buffers to the global buffers by setting the pointers. Static binding and dynamic binding techniques are devised. Experimental results prove the significance of the proposed techniques.

关键词： Application software Buffer storage Embedded system Signal synthesis Image processing Data engineering computer graphics Design optimization Software design Pipelines

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WER: Maximizing Parallelism of Irregular Graph applications Through GPU Warp EqualizeR

WER: Maximizing Parallelism of Irregular Graph Applications ...

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Asia and South pacific Design Automation conference

作者： En-Ming Huang Bo-Wun Cheng Meng-Hsien Lin Chun-Yi Lee Tsung Tai Yeh Department of Computer Science Elsa Lab National Tsing Hua University Hsinchu City Taiwan Department of Computer Science National Yang Ming Chiao Tung University Hsinchu City Taiwan

Irregular graphs are becoming increasingly prevalent across a broad spectrum of data analysis applications. Despite their versatility, the inherent complexity and irregularity of these graphs often result in the underutilization of Single Instruction, Multiple Data (SIMD) resources when processed on graphics Processing Units (GPUs). This underutilization originates from two primary issues: the occurrence of inactive threads and intra-warp load imbalances. These issues can produce idle threads, lead to inefficient usage of SIMD resources, consequently hamper throughput, and increase program execution time. To address these challenges, we introduce Warp EqualizeR (WER), a framework designed to optimize the utilization of SIMD resources on a GPU for processing irregular graphs. WER employs both software API and a specifically-tailored hardware microarchitecture. Such a synergistic approach enables workload redistribution in irregular graphs, which allows WER to enhance SIMD lane utilization and further harness the SIMD resources within a GPU. Our experimental results over seven different graph applications indicate that WER yields a geometric mean speedup of $2.52 \times$ and $1.47 \times$ over the baseline GPU and existing state-of-the-art methodologies, respectively.

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Interactive 3D audio rendering in flexible playback configurations

Interactive 3D audio rendering in flexible playback configur...

引用

Asia-pacific Signal and Information Processing Association Annual Summit and conference (APSIPA)

作者： Jean-Marc Jot DTS Inc. Los Gatos CA USA

ISBN: (纸本)9781467348638

Interactive object-based 3D audio spatialization technology has become commonplace in personal computers and game consoles. While its primary current application is 3D game sound track rendering, it is ultimately necessary in the implementation of any personal or shared immersive virtual world (including multi-user communication and telepresence). The successful development and deployment of such applications in new mobile or online platforms involves maximizing the plausibility of the synthetic 3D audio scene while minimizing the computational and memory footprint of the audio rendering engine. It also requires a flexible, standardized scene description model to facilitate the development of applications targeting multiple platforms. This paper reviews a general computationally efficient 3D positional audio and environmental reverberation rendering engine applicable to a wide range of loudspeaker or headphone playback configurations.

关键词： Reverberation Rendering (computer graphics) Loudspeakers Encoding Solid modeling Reflection

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CVRRG: an advanced raster map for geographic services on World Wide Web

CVRRG: an advanced raster map for geographic services on Wor...

引用

IEEE Region 10 International conference TENCON

作者： Seong Bok Park Tae Young Lee Agency for Defense Development South Korea

Combining the Internet with a geographic information system (GIS) provides a way of sharing geographical data remotely from the various locations without replication of the databases or the GIS software. An advanced raster map, VRRG (vectored restored raster graphics), and its compression algorithm for CVRRG (compressed VRRG) are introduced and it is shown how the CVRRG data could be manipulated in developing the GIS software which can support interactive geographic information efficiently over the World Wide Web using the client-side programming technique based on Java. As a result, this research shows that the CVRRG data are very useful and convenient for developing Web based GIS applications.

关键词： Web sites Geographic Information Systems Application software Printing Compression algorithms Java World Wide Web computer graphics Network servers Electronic mail

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Vehicle Detection and Classification based on Deep Neural Network for Intelligent Transportation applications

Vehicle Detection and Classification based on Deep Neural Ne...

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Asia-pacific Signal and Information Processing Association Annual Summit and conference (APSIPA)

作者： Chia-Chi Tsai Ching-Kan Tseng Ho-Chia Tang Jiun-In Guo Department of Electronics Engineering National Chiao Tung University Hsinchu Taiwan Smart Network System Institute Institute for Information Industry Taipei Taiwan

ISBN: (纸本)9781728102436;9789881476852

This paper proposes an optimized vehicle detection and classification method based on deep learning technology for intelligent transportation applications. We optimize the Convolutional Neural Network (CNN) architecture by fine-tuning the existing CNN architecture for the intelligent transportation applications. The proposed design achieves the accuracy of miss rate around 10% when FPPI is 0.1. Realized on nVidia Titan-X GPU, the proposed design can reach the performance about 720×480 video under different weather condition (day, night, raining) at 25fps. The proposed model can achieve 90% accuracy on three target vehicle classes including small vehicles (Sedan, SUV, Van), big vehicles (Bus) and Trucks.

关键词： computer architecture Object detection Vehicle detection Road transportation Deep learning graphics processing units Feature extraction

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