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A low-power graphics LSI integrating 29Mb embedded DRAM for mobile multimedia applications

A low-power graphics LSI integrating 29Mb embedded DRAM for ...

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Asia and South pacific Design Automation conference

作者： Ramchan Woo Sungdae Choi Ju-Ho Sohn Seong-Jun Song Young-Don Bae Hoi-Jun Yoo Department of EECS Korea Advanced Institute of Science and Technology Daejeon KOREA

ISBN: (纸本)0780381750

A low-power graphics LSI is designed and implemented for mobile multimedia applications. The LSI contains a 32bit RISC processor with enhanced MAC, a 3D rendering engine, programmable power optimizer, and 29Mh embedded DRAM. Full 3D graphics pipeline featuring 264Mtexelds texture-mapped 3D graphics as well as 2D MPEG-4 video decoding can be realized while consuming less than 210mW and 12lmm 2 chip area. The chip is implemented with 0.16μm pure DRAM process to reduce the fabrication cost. The real-time 3D graphics applications are successfully demonstrated by the fabricated chip on two PDA system boards.

关键词： graphics Large scale integration Random access memory Reduced instruction set computing Rendering (computer graphics) Bandwidth Clocks Engines Pipelines Fabrication

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A versatile interactive 3D brush model

A versatile interactive 3D brush model

引用

pacific conference on computer graphics and applications

作者： W.V. Baxter M.C. Lin Department of Computer Science University of North Carolina Chapel Hill Chapel Hill NC USA

We present a flexible modeling approach capable of realistically simulating many varieties of brushes commonly used in painting. Our geometric model of brush heads is a combination of subdivision surfaces and hundreds of individual bristles represented by thin polygonal strips. We exploit bristle-to-bristle coherence, simulating only a fraction of the bristles and using interpolation for the remainder. Our dynamic model incorporates realistic physically-based deformation, including anisotropic friction, brush plasticity, and tip spreading. We use an energy minimization framework with a novel geometric representation of the brush head to generate a wider variety of brushes. Finally, we have developed an improved haptic model that provides realistic force feedback, directly related to the results of the brush dynamic simulation. Using this model, we are able to simulate a wide range of brush styles and create an excellent variety of strokes such as the crisp, curvy strokes of Western decorative painting, or rough scratchy strokes like certain Oriental calligraphy. We have also developed an exporter for a popular free 3D modeling package that makes it easier for non-programmers to create any desired style of brush, real or fanciful.

关键词： Brushes Painting Solid modeling Strips Coherence Interpolation Deformable models Anisotropic magnetoresistance Friction Haptic interfaces

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A comparison of synchronous and cycle-static dataflow 29

A comparison of synchronous and cycle-static dataflow

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29th Asilomar conference on Signals, Systems and computers, ACSSC 1995

作者： Parks, Thomas M. Pino, JosC Luis Lee, Edward A. Department of Electrical Engineering and Computer Sciences University of California Berkeley United States

ISBN: (纸本)0818673702

We compare synchronous dataflow (SDF) and cyclo-static dataflow (CSDF), which are each special cases of a model of computation we call dataflow process networks. In SDF actors have static firing rules: They consume and produce a fixed number of data tokens in each firing. This model is well suited to multirate signal processing applications and lends itself to efficient static scheduling, avoiding the run-time scheduling overhead incurred by general implementations of process networks. In CSDF which is a generalization of SDF actors have cyclically changing firing rules. In some situations, the added generality of CSDF can unnecessarily complicate the scheduling. We show how higher-order functions can be used to transform a CSDF graph into a SDF graph, simplifying the scheduling problem. In other situations, CSDF has a genuine advantage over SDF: Simpler precedence constraints. We show how this makes it possible to eliminate unnecessary computations and expose additional parallelism. We use digital sample rate conversion as an example to illustrate these advantages of CSDF. © 1995 IEEE.

关键词： Signal processing

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3D video recorder

3D video recorder

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pacific conference on computer graphics and applications

作者： S. Wurmlin E. Lamboray O.G. Staadt M.H. Gross Computer Science Department Swiss Federal Institute of Technology Zurich Switzerland Computer Science Department University of California Davis Davis CA USA

We present the 3D video recorder, a system capable of recording, processing, and playing three-dimensional video from multiple points of view. We first record 2D video streams from several synchronized digital video cameras and store pre-processed images to disk. An off-line processing stage converts these images into a time-varying three-dimensional hierarchical point-based data structure and stores this 3D video to disk. We show how we can trade-off 3D video quality with processing performance and devise efficient compression and coding schemes for our novel 3D video representation. A typical sequence is encoded at less than 7 megabits per second at a frame rate of 8.5 frames per second. The 3D video player decodes and renders 3D videos from hard-disk in real-time, providing interaction features known from common video cassette recorders, like variable-speed forward and reverse, and slow motion. 3D video playback can be enhanced with novel 3D video effects such as freeze-and-rotate and arbitrary scaling. The player builds upon point-based rendering techniques and is thus capable of rendering high-quality images in real-time. Finally, we demonstrate the 3D video recorder on multiple real-life video sequences.

关键词： Video compression Rendering (computer graphics) Disk recording Video recording Streaming media Digital cameras Image converters Data structures Image coding Decoding

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Real-time 3D fluid simulation on GPU with complex obstacles

Real-time 3D fluid simulation on GPU with complex obstacles

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pacific conference on computer graphics and applications

作者： Youquan Liu Xuehui Liu Enhua Wu Inst. of Software Chinese Acad. of Sci. China Laboratory of Computer Science Institute of Software Chinese Academy and Sciences China Department of Computer and Information Science Faculty of Science and Technology University of Macau Macao China

ISBN: (纸本)0769522483

In this paper, we solve the 3D fluid dynamics problem in a complex environment by taking advantage of the parallelism and programmability of GPU. In difference from other methods, innovation is made in two aspects. Firstly, more general boundary conditions could be processed on GPU in our method. By the method, we generate the boundary from a 3D scene with solid clipping, making the computation run on GPU despite of the complexity of the whole geometry scene. Then by grouping the voxels into different types according to their positions relative to the obstacles and locating the voxel that determines the value of the current voxel, we modify the values on the boundaries according to the boundary conditions. Secondly, more compact structure in data packing with flat 3D textures is designed at the fragment processing level to enhance parallelism and reduce execution passes. The scalar variables including density and temperature are packed into four channels of texels to accelerate the computation of 3D Navier-Stokes equations (NSEs). The test results prove the efficiency of our method, and as a result, it is feasible to run middle-scale problems of 3D fluid dynamics in an interactive speed for more general environment with complex geometry on PC platform.

关键词： Fluid dynamics Parallel processing Boundary conditions Layout Technological innovation Solids Computational geometry Temperature Acceleration Navier-Stokes equations

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A GMM-Based handset selector for channel mismatch compensation with applications to speaker identification 2nd

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2nd IEEE pacific-Rim conference on Multimedia, IEEE-PCM 2001

作者： Yiu, K.K. Mak, M.W. Kung, S.Y. Center for Multimedia Signal Processing Dept. of Electronic and Information Engineering The Hong Kong Polytechnic University Hong Kong

ISBN: (纸本)3540426809

In telephone-based speaker identification, variation in handset characteristics can introduce severe speech variability even for speech uttered by the same speaker. This paper proposes a method to compensate the variation in handset characteristics. In the method, a number of Gaussian mixture models are independently trained to identify the most likely handset given a test utterance. The identified handset is used to select a compensation vector from a set of pre-computed vectors, where the pre-computed vectors are the average frame-by-frame differences between the clean and distorted utterances. The clean features are then recovered by subtracting the selected compensation vector from the distorted vectors. Experimental results based on 138 speakers of the YOHO and telephone YOHO corpora show that the proposed approach is computationally efficient and is able to increase the accuracy from 17% (without compensation) to 85% (with compensation). © Springer-Verlag Berlin Heidelberg 2001.

关键词： Vectors

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Responsive multimedia system for virtual storytelling

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6th pacific Rim conference on Multimedia - Advances in Mulitmedia Information Processing - PCM 2005

作者： Lee, Youngho Oh, Sejin Park, Youngmin Lee, Beom-Chan Park, Jeung-Chul Oh, Yoo Rhee Lee, Seokhee Oh, Han Ryu, Jeha Lee, Kwan H. Kim, Hong Kook Lee, Yong-Gu Kim, Jongwon Ho, Yo-Sung Woo, Woontack GIST U-VR Lab. Gwangju 500-712 Korea Republic of Human-Machine-Computer Interface Lab. Korea Republic of Intelligent Design and Graphics Lab. Korea Republic of Speech Audio and Language Communications Lab. Korea Republic of Nanoscale Simulation Lab. Korea Republic of Network Media Lab. Korea Republic of Visual Communications Lab. Korea Republic of

ISBN: (纸本)3540300279

In this paper, we propose Responsive Multimedia System (RMS) for a virtual storytelling. It consists of three key components;Multi-modal Tangible User Interface (MTUI), a Unified Context-aware Application Model for Virtual Environments (vr-UCAM), and Virtual Environment Manager (VEManager). MTUI allows users to interact with virtual environments (VE) through human's senses by exploiting tangible, haptic and vision-based interfaces. vr-UCAM decides reactions of VE according to multi-modal input. VEManager generates dynamic VE by applying the reactions and display it through 3D graphics and 3D sounds, etc. To demonstrate an effectiveness of the proposed system, we implemented a virtual storytelling system which unfolds a legend of Unju Temple. We believe the proposed system plays an important role in implementing various entertainment applications. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Multimedia systems

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A new adaptive density estimator for particle-tracing radiosity

A new adaptive density estimator for particle-tracing radios...

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pacific conference on computer graphics and applications

作者： Wong Kam Wah Department of Computer Science and Information Systems University of Hong Kong Hong Kong China

ISBN: (纸本)0769508685

In particle-tracing radiosity algorithms, energy-carrying particles are traced through an environment for simulating global illumination. Illumination on a surface is reconstructed from particle "hit points" on the surface, which is a density estimation problem (B.W. Silverman, 1986). Several methods can be used to solve this problem, such as the adaptive meshing method (R.F. Tobler et al., 1997), the kernel method (B. Walter et al., 1997), and the orthogonal series estimator (M. Feda, 1996). An orthogonal series estimator is proposed to tackle the problem. In the new method, the appropriate number of terms that should be used in the series is determined adaptively and automatically. Moreover a surface subdivision scheme is combined with the estimator to increase the accuracy of estimation. The new method has several advantages over other existing methods: (1) it requires less memory than the adaptive meshing method; (2) it does not store all the particle-hit points as in the kernel method; (3) it determines automatically how many terms should be used in the orthogonal series; (4) it incorporates surface subdivision to further increase the accuracy of estimation.

关键词： Lighting Kernel computer graphics Histograms Optical scattering Surface reconstruction State estimation computer science Information systems Computational modeling

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Comparison between the applications of Fragment-Based and Vertex-Based GPU Approaches in K-Means Clustering of Time Series Gene Expression Data

Comparison between the Applications of Fragment-Based and Ve...

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18th International conference on Neural Information Processing (ICONIP)

作者： Lam, Yau-King Situ, Wuchao Tsang, P. W. M. Leung, Chi-Sing Xiao, Yi

ISBN: (纸本)9783642249549;9783642249556

With the emergence of microarray technology, clustering of gene expression data has become an area of immense interest in recent years. However, due to the high dimensionality and complexity of the gene data landscape, the clustering process generally involves enormous amount of arithmetic operations. The problem has been partially alleviated with the K-Means algorithm, which enables high dimension data to be clustered efficiently. Further enhancement on the computation speed is achieved with the use of fragment shader running in a graphic processing unit (GPU) environment. Despite the success, such approach is not optimal as the process is scattered between the CPU and the GPU, causing bottleneck in the data exchange between the two processors, and the underused of the GPU. In this paper, we propose to realize the K-Means clustering algorithm with an integration of the vertex and the fragment shaders, which enables the majority of the clustering process to be implemented within the GPU. Experimental evaluation reflects that the computation efficiency of our proposed method in clustering short time gene expression is around 1.5 to 2 times faster than that attained with the conventional fragment shaders.

关键词： Gene clustering K-Means graphics Processing Unit (GPU) General-purpose computation Vertex shader program

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Interactive simulation of surgical cuts

Interactive simulation of surgical cuts

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pacific conference on computer graphics and applications

作者： D. Bielser M.H. Gross Computer Science Department ETH Zürich Switzerland

ISBN: (纸本)0769508685

Presents a framework for the interactive simulation of surgical cuts, such as those practiced in surgical treatment. Unlike most existing methods, our framework is based on tetrahedral volume meshes providing more topological flexibility. In order to keep the representation consistent, we apply adaptive subdivision schemes dynamically during the simulation. The detection of collisions between the surgical tool and the tissue is accomplished by using an axis-aligned bounding-box hierarchy which was adapted for deformable objects. For haptic rendering and feedback, we devised a mechanical scalpel model which accounts for the most important interaction forces between the scalpel and the tissue. The relaxation is computed using a localized, semi-implicit ODE (ordinary differential equation) solver. The achieved quality and performance of the presented framework is demonstrated using a human soft-tissue model.

关键词： Surgery Computational modeling Biological tissues Deformable models Humans computer simulation Haptic interfaces Solid modeling Feedback Equations

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