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A Real-time Multi-cue Hand Tracking Algorithm Based on computer Vision

A Real-time Multi-cue Hand Tracking Algorithm Based on Compu...

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conference on Virtual Reality 2010

作者： Pan, Zhigeng Li, Yang Zhang, Mingmin Sun, Chao Guo, Kangde Tang, Xing Zhou, Steven Zhiying Zhejiang Univ State Key Lab CAD&CG Hangzhou Zhejiang Peoples R China Intel Asia Pacific Res & Dev Ltd Beijing Peoples R China Beijing Univ Aeronaut & Astronaut State Key Virtual Real Beijing Peoples R China Natl Univ Singapore Dept Elect & Comp Engn Singapore 117548 Singapore

ISBN: (纸本)9781424462582

Although hand tracking algorithm has been widely used in virtual reality and HCI system, it is still a challenging problem in vision-based research area. Due to the robustness and real-time requirements in VR applications, most hand tracking algorithms require special device to achieve satisfactory results. In this paper, we propose an easy-to-use and inexpensive approach to track the hands accurately with a single normal webcam. Outstretched hand is detected by contour & curvature based detection techniques to initialize the tracking region. Robust multi-cue hand tracking is then achieved by velocity-weighted features and color cue. Experiments show that the proposed multi-cue hand tracking approach achieves continuous real-time results even for the situation of cluttered background. The approach fulfills the speed and accuracy requirements of frontal-view vision-based human computer interactions.

关键词： Hand tracking 3D Interaction Gesture detection

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Advances in Multimedia Information Processing - PCM 2005 1

引用

丛书名： Lecture Notes in computer Science

1000年

作者： Yo-Sung Ho Hyoung Joong Kim

ISBN: (数字)9783540321309

ISBN: (纸本)9783540300274

We are delighted to welcome readers to the proceedings of the 6th pacific-Rim conference on Multimedia (PCM). The first PCM was held in Sydney, Australia, in 2000. Since then, it has been hosted successfully by Beijing, China, in 2001, Hsinchu, Taiwan, in 2002, Singapore in 2003, and Tokyo, Japan, in 2004, and finally Jeju, one of the most beautiful and fantastic islands in Korea. This year, we accepted 181 papers out of 570 submissions including regular and special session papers. The acceptance rate of 32% indicates our commitment to ensuring a very high-quality conference. This would not be possible without the full support of the excellent Technical Committee and anonymous reviewers that provided timely and insightful reviews. We would therefore like to thank the Program Committee and all reviewers. The program of this year reflects the current interests of the PCM’s. The accepted papers cover a range of topics, including, all aspects of multimedia, both technical and artistic perspectives and both theoretical and practical issues. The PCM 2005 program covers tutorial sessions and plenary lectures as well as regular presentations in three tracks of oral sessions and a poster session in a single track. We have tried to expand the scope of PCM to the artistic papers which need not to be strictly technical.

关键词： Multimedia Information Systems Information Storage and Retrieval computer Communication Networks Information Systems applications (incl. Internet) computer graphics Image Processing and computer Vision

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Application of computer graphics Technology

Application of Computer Graphics Technology

引用

2011 2nd Asia-pacific conference on Wearable Computing Systems

作者： Wang Wei Institute of Art and Fashion Tianjin polytechnic university

computer graphics technology is very active in recent years, technology research, design applications in the more extensive and successful. With the development of computers and peripheral equipment, computer graphics functions have been greatly developed and improved software features computer graphics continue to strengthen, graphics itself toward standardization, integration and intelligent progress. Facing the information needs of design work to expand and intuitive, the pursuit of realistic virtual reality technology will be a large area of use. computer graphics technology will be diversified, forming a graphic image based, to be sound, touch and other sensory effects of the integrated form.

关键词： computer graphics technology design Virtual Reality

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Practical texture mapping on free-form surfaces

Practical texture mapping on free-form surfaces

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pacific conference on computer graphics and applications

作者： Y. Iwakiri Y. Omori T. Kanko Department of Information and Computer Sciences Toyohashi University of Technology Aichi Japan

ISBN: (纸本)0769508685

Concerns the problem of mapping photographic images on to the surface of a 3D object whose geometric data are already known. Although the minimal view selection algorithm of K. Matsushita and T. Kaneko (1999) enables the selection of a minimal number of camera positions, it often results in untextured patches due to camera misalignment: a deviation of actual camera position from the specified position. This paper proposes two new practical algorithms (double and product viewing) to ensure that all the polygons are textured even if there are unavoidable human errors in camera alignment. The performance of the algorithms is evaluated by simulation experiments.

关键词： Surface texture Cameras Geometry Geometrical optics Solid modeling Humans Shape measurement computer errors Computational modeling TV

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Sparse Approximation Methods and Their Parallel Implementation

Sparse Approximation Methods and Their Parallel Implementati...

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Russia and pacific conference on computer Technology and applications (RPC)

作者： A.A. Kim O.O. Lukovenkova Yu.V. Marapulets A.B. Tristanov IKIRFEB RAS Laboratory of Acoustic Research Paratunka Russia Department of Computer Science Kaliningrad State Technical University Kaliningrad Russia

ISBN: (纸本)9781538675328

The article is devoted to a new approach in the analysis of geoacoustic pulses. The authors proposed a mathematical model based on a sparse representation of the signal. An adaptive matching pursuit method has been developed to identify model parameters. A parallel implementation of this algorithm is proposed on the CUDA (Compute Unified Device Architecture) platform. This allows real-time processing and modeling of signals.

关键词： Matching pursuit algorithms Approximation algorithms Adaptation models Dictionaries Computational modeling graphics processing units Covariance matrices

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Classification for Fourier volume rendering

Classification for Fourier volume rendering

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pacific conference on computer graphics and applications

作者： Z. Nagy G. Miiller R. Klein Bond University Bonn Germany Institute for Computer Science II Bonn University Bonn Germany Rheinische Friedrich-Wilhelms-Universitat Bonn Bonn Nordrhein-Westfalen DE Inst. for Comput. Sci. II Bonn Univ. Germany

In the last decade, Fourier volume rendering (FVR) has obtained considerable attention due to its O(N/sup 2/logN) rendering complexity, where O(N/sup 3/) is the volume size. Although ordinary volume rendering has O(N/sup 3/) rendering complexity, it is still preferred over FVR for the main reason, that FVR offers bad localization of spatial structures. As a consequence, it was assumed, that it is hardly possible to apply ID transfer functions, which arbitrarily modify voxel values not only in dependence of the position, but also the voxel value. We show that this assumption is not true for threshold operators. Based on the theory of Fourier series, we derive a FVR method, which is capable of integrating all sample points greater (or alternatively, lower) than an iso-value T during rendering, where T can be modified interactively during the rendering session. We compare our method with other approaches and we show examples on well-known datasets to illustrate the quality of the renderings.

关键词： Transfer functions Fourier transforms computer science Fourier series Visualization Frequency domain analysis Material properties Biomedical optical imaging X-rays Medical services

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Thread-Based BRDF Rendering on GPU

Thread-Based BRDF Rendering on GPU

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pacific conference on computer graphics and applications

作者： Soonhyun Kim Min-Ho Kyung Joo-Haeng Lee Department of Information and Communication Ajou University Suwon South Korea Division of Digital Media Ajou University Suwon South Korea Electronics and Telecommunications Research Institute Daejeon South Korea

Rendering BRDF surfaces have been intensively studied to produce physically plausible appearance of surface materials. Illumination at a surface point is formulated as an integral of a BRDF producted with incident radiance over the hemi-sphere domain. One popular method to compute the integral is Monte Carlo integration which estimates it with a sum of the integrand evaluated at stochastically sampled rays. Although its simple nature is practically attractive, it has a serious drawback of noise artifacts in 3D rendering. In this paper, we propose a novel noise-free Monte Carlo rendering algorithm running on a GPU in real-time. The main contribution is a new importance sampling scheme providing consistent sample rays over surfaces. For each evenly spaced latitude angle of eye ray, denoted by θ, incident rays are sampled with a PDF derived from the target BRDF lobe. We use a force-based update method to make sample rays consistent between consecutive θ's. Finally, corresponding sample rays are linearly connected to form a smooth curve, called a sample thread. In rendering, the sample rays for a surface point are obtained as thread points specified by θ. Since the threads provide sample rays consistently varying on the surface, the estimation variance manifesting image noise is minimized. A thread set is precomputed for each BRDF before rendering so that no sampling overhead is imposed on the GPU. According to our experiments, about 100 threads are sufficient for most measured BRDFs to achieve a plausible quality, which enables the interactive performance.

关键词： Rendering (computer graphics) Monte Carlo methods Instruction sets Lighting Noise graphics processing unit Materials

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Fitting subdivision surfaces to unorganized point data using SDM

Fitting subdivision surfaces to unorganized point data using...

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pacific conference on computer graphics and applications

作者： K.-S.D. Cheng Wenping Wang Hong Qin K.-Y.K. Wong Huaiping Yang Yang Liu Department of Computer Science University of Hong Kong Hong Kong China Department of Computer Science State University of New York Stony Brook Stony Brook NY USA

We study the reconstruction of smooth surfaces from point clouds. We use a new squared distance error term in optimization to fit a subdivision surface to a set of unorganized points, which defines a closed target surface of arbitrary topology. The resulting method is based on the framework of squared distance minimization (SDM) proposed by Pottmann et al. Specifically, with an initial subdivision surface having a coarse control mesh as input, we adjust the control points by optimizing an objective function through iterative minimization of a quadratic approximant of the squared distance function of the target shape. Our experiments show that the new method (SDM) converges much faster than the commonly used optimization method using the point distance error function, which is known to have only linear convergence. This observation is further supported by our recent result that SDM can be derived from the Newton method with necessary modifications to make the Hessian positive definite and the fact that the Newton method has quadratic convergence.

关键词： Surface fitting Newton method Surface reconstruction Optimization methods Minimization methods Shape control Least squares methods Spline computer science computer errors

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Shadow generation using discretized shadow volume in angular coordinates

Shadow generation using discretized shadow volume in angular...

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pacific conference on computer graphics and applications

作者： K. Thakur F. Cheng K.T. Miura Lexmark International Inc. Lexington KY USA University of Kentucky Lexington KY USA Shizuoka University Hamamatsu Japan

A technique to improve the performance of the shadow-volume method is presented. This technique does not require (1) extensive edge/edge intersection tests and intersection angle computation in shadow polygon construction, or (2) any ray/shadow-polygon intersection tests during scan-conversion. The first task is achieved by constructing ridge edge (RE) loops, an inexact form of silhouette, instead of the silhouette. The RE loops give us the shadow volume without any expensive computation. The second task is achieved by discretizing the shadow volume into angular spans. The angular spans, which correspond to scan lines, are stored in a lookup table. This lookup table enables us to mark the pixels that are in shadow directly, without the need of performing any ray/shadow-polygon intersection tests. In addition, the shadow on an object is determined on a line-by-line basis instead of a pixel-by-pixel basis. The new technique is efficient enough to achieve real time performance, without any special hardware, while being scalable with scene size.

关键词： Testing Layout Light sources Table lookup Hardware computer graphics Ray tracing Performance evaluation Lighting Optical refraction

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Compression of indoor video sequences using homography-based segmentation

Compression of indoor video sequences using homography-based...

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pacific conference on computer graphics and applications

作者： Tae-Joon Park S. Fleishman D. Cohen-Or D. Lischinski Computer Software Technology Laboratory Electronics and Telecommunications Research Institute South Korea Computer Science Department Tel-Aviv University Israel School of Computer Science and Engineering Hebrew University of Jerusalem Israel

ISBN: (纸本)0769508685

We present a new compression algorithm for video sequences of indoor scenes, or more generally, sequences containing mostly planar and near-planar surfaces. Our approach utilizes edge and optical flow information in order to segment selected keyframes into regions of general shape, such that the motion of each region is predicted well by a planar homography. With this kind of motion prediction, the errors between the predicted intermediate frames and the actual ones are very small, and can be compactly encoded. Our results demonstrate significant improvements in the accuracy of the compressed video sequences, compared to standard general purpose video compression.

关键词： Video sequences Video compression Image coding Layout computer science Image storage Multimedia communication Broadcasting MPEG 4 Standard Transform coding

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