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Speeding up k-means algorithm by GPUs

Speeding up k-means algorithm by GPUs

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10th IEEE International conference on computer and Information Technology, CIT-2010, 7th IEEE International conference on Embedded Software and Systems, ICESS-2010, 10th IEEE Int. Conf. Scalable Computing and Communications, ScalCom-2010

作者： Li, You Zhao, Kaiyong Chu, Xiaowen Liu, Jiming Department of Computer Science Hong Kong Baptist University Hong Kong

ISBN: (纸本)9780769541082

Cluster analysis plays a critical role in a wide variety of applications, but it is now facing the computational challenge due to the continuously increasing data volume. Parallel computing is one of the most promising solutions to overcoming the computational challenge. In this paper, we target at parallelizing k-Means, which is one of the most popular clustering algorithms, by using the widely available graphics Processing Units (GPUs). Different from existing GPU-based k-Means algorithms, we observe that data dimension is an important factor that should be taken into consideration when parallelizing k-Means on GPUs. In particular, we use two different strategies for low-dimensional data sets and high-dimensional data sets respectively, in order to make the best use of the power of GPUs. For low-dimensional data sets, we exploit GPU on-chip registers to significantly decrease data access latency. For highdimensional data sets, we design a novel algorithm which simulates matrix multiplication and exploits GPU on-chip registers and also on-chip shared memory to achieve high compute-to-memory-access ratio. As a result, our GPU-based k-Means algorithm is three to eight times faster than the best reported GPU-based algorithm. © 2010 IEEE.

关键词： graphics processing unit

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Universal Capture through Stereographic Multi-perspective Recording and Scene Reconstruction

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10th pacific Rim conference on Multimedia

作者： Kuchelmeister, Volker UNSW Univ New S Wales Sydney Cinema Ctr Interact Cinema Res Sydney NSW Australia

ISBN: (纸本)9783642104664

this paper describes a prototype for an installation which combines stereographic video and real-time 3D computer graphic to demonstrate a novel method of documenting dance and other performing art practices through multi-perspective recording, volumetric geometry reconstruction and universal playback the fidelity and high level of detail in the video imagery is augmented and completed with the voxel representation Multi-perspective recording in combination with voxelization offers a universal view on a scene A viewer is not limited to one point-of-view or moment in time. but he can explore and analyze the scene freely and without space or tulle restrictions Potential areas of application are in performing arts. in professional sport and the Movie FX industry

关键词： Augmented Mixed Reality Visual Effects Virtual Reality graphics Techniques Mixed Media Interactive computer graphics

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PGP2X: Principal geometric primitives parameters extraction 10

PGP2X: Principal geometric primitives parameters extraction

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10th International conference on computer graphics theory and applications, GRAPP 2015

作者： Toony, Zahra Laurendeau, Denis Gagné, Christian Computer Vision and System Laboratory Department of Electrical and Computer Engineering Université Laval QuébecQC Canada

ISBN: (纸本)9789897580871

In reverse engineering, it is important to extract the 3D geometric primitives that compose an object. It is also important to find the values of the parameters describing each primitive. this paper presents an approach for the estimation of the parameters of geometric primitives once their type is known using 3D information. the primitives of interest are planes, spheres, cylinders, cones, tori and partial instances of the latter four types. the proposed approach extends methods found in the literature for planes, spheres, cylinders and cones and proposes a new method for dealing with tori. the results of the proposed method are compared to approaches found in the literature as well as with ground truth values. the proposed method can be applied to the estimation of parameters of geometric primitives of synthetic CAD models as well as for models of real objects acquired with 3D scanners. Copyright © 2015 SCITEPRESS - Science and Technology Publications. All rights reserved.

关键词： Principal component analysis

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VISIGRAPP 2019 - Proceedings of the 14th International Joint conference on computer Vision, Imaging and computer graphics theory and applications

VISIGRAPP 2019 - Proceedings of the 14th International Joint...

引用

10th International conference on Information Visualization theory and applications, IVAPP 2019 - Part of the 14th International Joint conference on computer Vision, Imaging and computer graphics theory and applications, VISIGRAPP 2019

ISBN: (纸本)9789897583544

the proceedings contain 37 papers. the topics discussed include: breaking the curse of visual data exploration: improving analyses by building bridges between data world and real world;visual analytics of multidimensional projections for constructing classifier decision boundary maps;equivalence of turn-regularity and complete extensions;compensation of simultaneous orientation contrast in superimposed textures;visual growing neural gas for exploratory data analysis;parallel coordinates-based visual analytics for materials property;synthesizing light field volumetric visualizations in real-time using a compressed volume representation;lightweight coordination of multiple independent visual analytics tools;and coordinated image- and feature-space visualization for interactive magnetic resonance spectroscopy imaging data analysis.

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Mesh deformation under skeleton-based detail-preservation

Mesh deformation under skeleton-based detail-preservation

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2007 10th IEEE International conference on computer Aided Design and computer graphics, CAD/graphics 2007

作者： Wu, Jinzhong Liu, Xuehui Wu, Enhua State Key Lab. of Computer Science Institute of Software Chinese Academy of Sciences Beijing China Department of Computer and Information Science University of Macau Macao China Graduate University Chinese Academy of Sciences Beijing China

ISBN: (纸本)9781424415793

With in skeleton based deformation, two issues are waiting for investigation, large angle rotation and artifacts near joint regions. In this paper we propose rotation angle decomposition and detail preserving method to conquer them. A skeleton with multiple connected bones is prior computed for a triangle mesh. While deforming, large angle rotation is simulated by several progressive small angle rotations. We also introduce a distortion metric function E to quantify the difference between mesh edge vectors before and after deformation, preserving the detail of mesh surfaces. Nearby vertex position blending is enforced. We use sparse conjugate gradient method for the minimization of metric function E. Results show our method is suitable for 3D modeling and character animation applications, making the deformation near joint regions more natural. © 2007 IEEE.

关键词： Deformation

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Virtual agents and multi-modality of interaction in multimedia applications for cultural heritage: A case study 10

Virtual agents and multi-modality of interaction in multimed...

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10th International conference on computer graphics theory and applications, GRAPP 2015

作者： Neto, João Ribeiro, Claudia Pereira, João Neto, Maria João INESC-ID Lisbon Portugal Instituto Superior Técnico Universidade Técnica de Lisboa Lisbon Portugal Faculdade de Letras Universidade de Lisboa Lisbon Portugal

ISBN: (纸本)9789897580871

Cultural Heritage encompasses a set of traditions and commodities inherited from our ancestors, and it is vital to convey and preserve them for the next generation. Cultural Multimedia applications and Serious Games form an important pedagogical and didactic medium, mainly for a young demography, which can learn while playing. In this paper is presented an innovative platform, named EI2VA (Engine for Immersive Interaction with Virtual Agents), in which a virtual character, endowed with facial, corporal and behavioural animation can be integrated in multimedia applications. these multimedia applications, derived from the Fala Comigo project, which set the example for a possible use of this technology, preserving the historical and cultural contents indispensable for the users, based on a multi-modality of evident interaction. the resulting multimedia applications were used in a case study conduct with three different user groups (experts and nonexperts) in different settings including classroom, museum and scientific conference. Copyright © 2015 SCITEPRESS - Science and Technology Publications. All rights reserved.

关键词： Serious games

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A new adaptive sampling technique for Monte Carlo global illumination

A new adaptive sampling technique for Monte Carlo global ill...

引用

2007 10th IEEE International conference on computer Aided Design and computer graphics, CAD/graphics 2007

作者： Qing, Xu Feixas, Miquel Sbert, Mateu Jizhou, Sun School of Computer Science and Technology Tianjin University Tianjin 300072 China Institute of Information and Applications University of Girona Girona 17003 Spain

ISBN: (纸本)9781424415793

Monte Carlo is the only choice of physically correct method to compute the problem of global illumination in the field of realistic image synthesis. Adaptive sampling is an appealing tool to eliminate noise, which is one of the main problems of Monte Carlo based global illumination algorithms. In this paper, we investigate the use of entropy in the domain of information theory to measure pixel quality and to do adaptive sampling. Especially we explore the nonextensive Tsallis entropy, in which a real number q is introduced as the entropic index that presents the degree of nonextensivity, to evaluate pixel quality. By utilizing the least-squares design, an entropic index q can be obtained systematically to run adaptive sampling effectively. Implementation results show that the Tsallis entropy driven adaptive sampling significantly outperforms the existing methods. To our knowledge, this may be the first try on the systematic choice of an appropriate entropic index to Tsallis entropy in the engineering fields. © 2007 IEEE.

关键词： Pixels

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Localization of visual codes using fuzzy inference system 10

Localization of visual codes using fuzzy inference system

引用

10th International conference on computer Vision theory and applications, VISAPP 2015

作者： Bodnár, Péter Nyúl, László G. Department of Image Processing and Computer Graphics University of Szeged Szeged Hungary

ISBN: (纸本)9789897580901

Usage of computer-readable visual codes is common in everyday life. the reading process of visual codes consists of two steps, localization and data decoding. this paper introduces a fast and robust method for localization of visual codes using Fuzzy Inference Systems based on simplistic, attentive features which can be optionally extended with cell histograms. Input image properties, assigned membership functions and efficiency of the system has been evaluated and discussed, showing FIS is a viable alternative for rapid QR code recognition in the image domain. the basic approach can be also used with lookup tables, that speeds up image cell evaluation and makes it ideal for embedded systems.

关键词： Object detection

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Synthesizing realistic shadows with bumpy surface and object model estimated by shadows in single image 10

Synthesizing realistic shadows with bumpy surface and object...

引用

10th International conference on computer graphics theory and applications, GRAPP 2015

作者： Wu, Jung-Hsuan Saito, Suguru Department of Computer Science Tokyo Institute of Technology Tokyo Japan Department of Informance Sciences Ochanomizu University Tokyo Japan

ISBN: (纸本)9789897580871

Shadows play an important role in the human perception of 3D geometry in photographs, and properly synthesized shadows produce a realistic rendering result. Shadows, especially hard shadows, define powerful constraints between a light source, occluders, and the surfaces onto which shadows are cast. We aim to create a pseudo 3D scene in which the light produces shadows that are the same as those in the input image by taking the shadow constraints into account. Our method requires only a few user annotations and an input image, with the objects and their cast-shadows segmented in advance. the segmentation and the user annotations are used to create a shadow-free texture and a 3D scene, and users can then interactively edit the image by moving the objects and changing the lighting. Our system produces realistic shadows in real-time while enabling interactive editing. Copyright © 2015 SCITEPRESS - Science and Technology Publications. All rights reserved.

关键词： Light sources

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CEFM: A heuristic mesh segmentation method based on convexity estimation and fast marching 10

CEFM: A heuristic mesh segmentation method based on convexit...

引用

10th International conference on computer graphics theory and applications, GRAPP 2015

作者： Zhang, Jun Lian, Zhouhui Liu, Zhenbao Xiao, Jianguo Institute of Computer Science and Technology Peking University Beijing China School of Aeronautics Northwestern Polytechnical University Xi'an China

ISBN: (纸本)9789897580871

Mesh segmentation is a fundamental way of shape analysis and understanding for 3D mesh models. In this paper, we propose an effective heuristic mesh segmentation algorithm, which is based on concave areas detection and heuristic 2-category classification via fast marching. the algorithm has several merits. First, the boundary between each pair of segments is close to the natural seams of 3D objects. Second, it is robust against pose variations and isometric transformations. Finally, our algorithm decomposes non-rigid 3D models into a set of rigid components in a short period of time and the procedure is fully automatic. Extensive experiments in this paper demonstrate that the proposed method outperforms the state of the art in mesh segmentation. Copyright © 2015 SCITEPRESS - Science and Technology Publications. All rights reserved.

关键词： Heuristic methods

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