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Posture recognition and segmentation from 3d human body scans 1

Posture recognition and segmentation from 3D human body scan...

引用

1st international symposium on 3d data processing visualization and transmission

作者： Werghi, N Xiao, YJ Univ Glasgow Dept Comp Sci Glasgow G12 8QQ Lanark Scotland

ISBN: (纸本)0769515223

This paper addresses the problem of segmenting 3d scan data of human body (HB) into sets corresponding to the HB parts, where the posture of the body is unknown. The approach consists in recognizing first the posture, then exploiting the information retrieved from the posture recognition into the segmentation process. For the recognition, the wavelet transform coefficients (WTC) are suggested as new 3d shape descriptors. Then Segmentation technique integrating the model posture information is presented. The segmentation results are illustrated on human body scans of different postures.(1).

关键词： Wavelet transforms

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Optimal and near-optimal solutions for 3d structure comparisons 1

Optimal and near-optimal solutions for 3D structure comparis...

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1st international symposium on 3d data processing visualization and transmission

作者： Caprara, A Lancia, G Univ Bologna DEIS I-40136 Bologna Italy

ISBN: (纸本)0769515223

In this paper we describe exact and heuristic algorithms for the comparison of 3d structures via their contact maps. Given two contact maps, we consider the problem of finding the optimal sequence-order dependent and sequence order independent alignments. We describe an integerprogramming formulation of the problems along with a Lagrangian relaxation yielding stronger bounds than previous approaches. This relaxation is used to drive both a greedy heuristic capable of finding near-optimal solutions and an exact branch-and-bound algorithm. We report computational results for an application of our model to the problem of aligning 3d structures of folded proteins from the Protein data Bank.

关键词： Heuristic algorithms

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Long-range high-performance time-of-flight-based 3d imaging sensors 1

Long-range high-performance time-of-flight-based 3D imaging ...

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1st international symposium on 3d data processing visualization and transmission

作者： Ullrich, A Studnicka, N Riegl, J Orlandini, S RIEGL Laser Measurement Syst GmbH A-3580 Horn Austria

ISBN: (纸本)0769515223

A family of high-performance 3d imaging laser sensor are presented providing rapid acquisition of 3d data of naturally reflecting objects within a wide field-of-view and up to ranges up to 1000 meters. Beside the basic 3d-information the sensors also supply, pixel for pixel, true color information gained by an additional passive channel. This color information allows an instantaneous automatic texturing of 3d models. The sensor are of a rugged and compact design and can thus be used even under adverse environmental conditions. Potential applications include scene acquisition for virtual reality modeling, 3d-imaging of large buildings in the field of architecture, topographic mapping and dimensional measurements of vessels, furnaces, tanks, etc. The sensor makes use of high-speed laser ranging based on the time-of-flight method using a pulsed laser source in combination with precise mechanical scanning of the measuring beam. data are provided at a standard parallel interface allowing easy integration with any standard PC based system for data visualization and data processing. These data are provided with an average data rate up to 18 000 measurements per second. Examples of data acquired with the sensors are presented, accuracy and ranging capability are discussed.

关键词： 3d data acquisition 3d range image sensor 3d images texturing virtual reality

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Neuroanatomical imaging: Constrained 3d reconstruction using variational implicit techniques 1

Neuroanatomical imaging: Constrained 3D reconstruction using...

引用

1st international symposium on 3d data processing visualization and transmission

作者： Bouteiller, JM Baudry, M Univ So Calif Los Angeles CA 90089 USA

ISBN: (纸本)0769515215;0769515223

Variational implicit surfaces have been widely used in computer graphics and animation and generally provide solutions for uniformly distributed sparse data. The fields of medicine and biology increasingly rely on accurate three-dimensional reconstructions. despite the fact that biological structures fit perfectly within the scope of variational implicit interpolation (smooth closed surfaces), the data to model in these fields constitute a computational challenge (sparse non-homogeneous data, high curvatures). Several parametric and simplicial approaches have been presented [1, 2]. This paper presents an approach for creating and optimizing 3d reconstructions based on variational implicit surfaces for a dataset consisting of serial parallel sections. Preliminary results and perspectives are presented.

关键词： Image reconstruction

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3d shape estimation based on density driven model fitting 1

3D shape estimation based on density driven model fitting

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1st international symposium on 3d data processing visualization and transmission

作者： Borovikov, E davis, L Univ Maryland Dept Comp Sci College Pk MD 20742 USA

ISBN: (纸本)0769515223

We introduce a generic and e cient method for 2d and 3d shape estimation via density fields. Our method models shape as a density map and uses the notion of density to fit a model to a rapidly computed occupancy map of the foreground object. We show how to utilize hierarchical (pyramid-like) object segmentation data to regularize a hierarchical model fitting. With primary focus on estimating 3d shapes of non-rigid articulated objects such as human bodies, we illustrate our approach with examples of c cient model fitting to 3d occupancy maps of human figures. We also discuss a number of extensions of our method to applications involving non-rigid object tracking and movement analysis.

关键词： Hierarchical systems

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3d mesh wavelet coding using efficient model-based bit allocation 1

3D mesh wavelet coding using efficient model-based bit alloc...

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1st international symposium on 3d data processing visualization and transmission

作者： Payan, F Antonini, M CNRS I3S Lab F-06903 Sophia Antipolis France

ISBN: (纸本)0769515223

In this paper, we propose an efficient low complexity geometry compression scheme for densely sampled irregular 3d meshes. This scheme is based on 3d multiresolution analysis (3d discrete Wavelet Transform) and includes a model-based bit allocation process across the wavelet subbands. Coordinates of 3d wavelet coefficients are processed separately and statistically modeled by a generalized Gaussian distribution. This permits an efficient allocation even at low bitrate with very low complexity. Moreover, we introduce predictive geometry coding of LF subbands by taking in account the correlation of the coarsest level coefficients. Finally, we use EBCOT coder to efficiently encode the quantized coefficients.

关键词： discrete wavelet transforms

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Coding with ASCII: compact, yet text-based 3d content 1

Coding with ASCII: compact, yet text-based 3D content

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1st international symposium on 3d data processing visualization and transmission

作者： Isenburg, M Snoeyink, J Univ N Carolina Chapel Hill NC 27514 USA

ISBN: (纸本)0769515215;0769515223

Because of the convenience of a text-based format 3d content is often published in form of a gzipped file that contains an ASCII description of the scene graph. While compressed image, audio, and video data is kept in separate binary files, polygon meshes and interpolators are usually included uncompressed into the ASCII description, as there is no widely-accepted standard for such data. In this paper we show how to use compressed polygon meshes and compressed interpolators within a purely textbased format. Our scheme codes these data-heavy nodes as ASCII strings that compress well with standard gzip compression. Specifically we demonstrate the efficiency of this technique on a sparse scene composed of many small polygon meshes. While typical for 3d content on the Web, such scenes tend to be more difficult to compress.

关键词： Geometry

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3d interactive, on-site visualization of Ancient Olympia 1

3D interactive, on-site visualization of Ancient Olympia

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1st international symposium on 3d data processing visualization and transmission

作者： Vlahakis, V Karigiannis, J Ioannidis, N Tsotros, M Gounaris, M Sticker, d daehne, P Almeida, L Intracom S.A. Greece Fraunhofer Institut fur Graphische Datenverarbeitung Germany Zentrum fur Graphische Datenverarbeitung Germany Centro de Computacao Grafica Portugal

ISBN: (纸本)0769515223

This paper describes the work performed for the ARCHEOGUIdE (Augmented Reality-based Cultural Heritage On-site GUIdE) project. ARCHEOGUIdE is funded by the EU 1ST framework (1ST-1999-11306), and pursued by a consortium of European organisations. It delivers an interactive, personalized, augmented reality, (A R) guide for the visualization of ruined archaeological sites. It is based on mobile real-time computing, networking and 3d visualization. Its users are presented with monument reconstructions, navigation aid and historical information in a user-friendly way through the use of multi-modal interaction techniques. The key features of the system are a novel hybrid position and orientation tracking technique used in determining the user's viewpoint, navigation aid, outdoor operation, and real-time 3d visualization of monuments, artifacts, and life. This paper presents examples of the system's use at the archaeological site of Ancient Olympia in Greece.

关键词： augmented reality position tracking

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3d reality modelling:: Photo-realistic 3d models of real world scenes 1

3D reality modelling:: Photo-realistic 3D models of real wor...

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1st international symposium on 3d data processing visualization and transmission

作者： Sequeira, V Gonçalves, JGM European Commiss Joint Res Ctr I-21020 Ispra Italy

ISBN: (纸本)0769515215;0769515223

This paper presents a 3d reality modelling system, applying lasers and digital photography to create super-accurate photo-realistic three-dimensional worlds. A key feature of the 3d reality system is its flexibility. It can be used with all common long-range scanners and digital or video cameras, without the need of any pre-calibration or static arrangement between the different sensors. The system can be used for a wide range of applications in industry and science, as well as for environmental modelling and virtual reality presentations. The 3d models are sufficiently lifelike to be used in sectors such as real estate, culture heritage and construction. Results can be exported to all major 3d software and CAd packages or viewed via a web browser.

关键词： Virtual reality

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Super high resolution 3d imaging and efficient visualization 1

Super high resolution 3D imaging and efficient visualization

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1st international symposium on 3d data processing visualization and transmission

作者： Cheng, I Basu, A Univ Alberta Dept Comp Sci Edmonton AB T6G 2E8 Canada

ISBN: (纸本)0769515223

In this paper we describe and demonstrate our technology for creating super high resolution & 3d digital content for a variety of applications including museum artifacts and galleries, archeology, anthropology, art design and heritage conservation. Our hardware can capture minute details of static scenes in a composite panoramic format with details surpassing the human eye. We also propose an approach to storing SHR 3d images for efficient retrieval over bandwidth limited networks, such as the Internet. Regions of interest specified by users are stored in multiple levels of detail hierarchy. An implementation of the browser for Virtual Museums is also presented. In addition to browsing images, our software provides the ability to support "interactive story telling." As viewers interact with a picture using a mouse, the descriptions of objects in the scene appear depending on the location of the mouse and the level of detail in the scene. Finally, the "Zoomagge" tools can be used by academic researchers for various applications including object recognition, digital archiving, accurate stereo reconstruction, and 3d visualization.

关键词： super high resolution & 3d imaging interactive visualization user interface

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