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检索条件"任意字段=3rd International Symposium on 3D Data Processing, Visualization, and Transmission, 3DPVT 2006"

共 148 条记录，以下是31-40 订阅

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Flatness and orientation signature for modeling and matching 3d objects

Flatness and orientation signature for modeling and matching...

引用

3rd international symposium on 3d data processing, visualization and transmission

作者： darbandi, H. B. Ito, M. Little, J. Univ British Columbia Elect & Comp Engn Vancouver BC V5Z 1M9 Canada Univ British Columbia Comp Sci Vancouver BC V5Z 1M9 Canada

ISBN: (纸本)9780769528250

This paper proposes a new technique for modeling and matching three-dimensional rigid objects by encoding the fluctuation of the surface and the variation of its normal around an oriented point on the surface as the surface expands. The surface of the object is encoded into two two-dimensional curves as the surface signature on each point, and then the collection of the signatures are used to model and match the object. The signatures implicitly encode the curvature and symmetry of the surface around an oriented point. This modeling technique is robust to scale, orientation, noise, patch resolution, occlusion, and cluttering.

关键词： Encoding (symbols)

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Geometry refinement of 3d surfaces using kriging

Geometry refinement of 3D surfaces using kriging

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3rd international symposium on 3d data processing, visualization and transmission

作者： Grinstead, Brad Koschan, Andreas Abidi, Mongi A. Univ Tennessee Imaging Robot & Intelligent Syst Lab Knoxville TN 37996 USA

ISBN: (纸本)9780769528250

3d imaging is a popular method for acquiring accurate models for a variety of applications. However, the size of the geometric features that can be modeled in this manner is dependant on the scanning system's resolution. This paper presents a method that attempts to accurately reconstruct regions whose features are at or below the system's scanning resolution, combining automatic region selection with a form of kriging. A curvature-based segmentation is followed by an automated geometry refinement procedure in which the model of spatial correlation between the irregularly sampled 3d data is automatically determined. Geometry refinement is done by a regularized kriging approach that is designed to preserve the sharp features typical to many 3d laser range applications. This method is validated on synthetic data, showing that the accuracy of our method is higher than that of its standard competitors. Then, the performance on real data is demonstrated through several examples.

关键词： Kriging

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Graph cut based multiple view segmentation for 3d reconstruction

Graph cut based multiple view segmentation for 3D reconstruc...

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3rd international symposium on 3d data processing, visualization and transmission

作者： Sormann, Mario Zach, Christopher Kamer, Konrad VRVis Res Ctr Inffeldgasse 16-2 A-8010 Graz Austria

ISBN: (纸本)9780769528250

In this paper we propose a novel framework for efficiently extracting foreground objects in so called short-baseline image sequences. We apply the obtained segmentation to improve subsequent 3d reconstruction results. Essentially, our framework combines a graph cut based optimization algorithm with an intuitive user interface. At first a meanshift segmentation algorithm partitions each image of the sequence into a certain number of regions. Additionally we provide an intelligent graphical user interface for easy specification of foreground as well as background regions across all images of the sequence. Within the graph cut optimization algorithm we define new energy terms to increase the robustness and to keep the segmentation of the foreground object coherent across all images of the sequence. Finally, a refined graph cut segmentation and several adjustment operations allow an accurate and effective foreground extraction. The obtained results are demonstrated on several real world data sets.

关键词： Graphical user interfaces

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Multi-chart geometry video:: a compact representation for 3d animations

Multi-chart geometry video:: a compact representation for 3D...

引用

3rd international symposium on 3d data processing, visualization and transmission

作者： Mamou, Khaled Zaharia, Titus Preteux, Francoise Inst Natl Telecommun ARTEMIS Dept Grp Ecole Telecommun 9 Rue Charles Fourier F-91011 Evry France

ISBN: (纸本)9780769528250

This paper introduces a new compression scheme, so-called Multi-Chart Geometry Video (MCGV), for 3d dynamic meshes with constant connectivity and time-varying geometry. The core of the proposed method is a piecewise affine predictor coupled with a Multi-Chart Geometry IMage (MCGIM) representation of the residual errors. The mesh is first partitioned into vertex clusters whose motion can be accurately described by a unique 3d affine transform. The prediction errors are represented as MCGIMs which are compressed by using standardized image encoders such as JPEG and MPEG-4. The performances of our encoder are objectively evaluated on a data set of six animation sequences with various sizes, geometries and topologies, and exhibiting both rigid and elastic motions. The experimental evaluation shows that the proposed MCGV achieves up to 60% lower compression distortions than the geometry video approach, while outperforming (with 30% to 94% lower distortions) the RT MPEG-4/AFX-IC, d3dMC, PCA and dynapack techniques.

关键词： Geometry

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Region-based motion analysis and 3d reconstruction for a translational video sequence

Region-based motion analysis and 3D reconstruction for a tra...

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3rd international symposium on 3d data processing, visualization and transmission

作者： Huang, Xiaodong dubois, Eric Univ Ottawa Sch Informat Technol & Engn Ottawa ON K1N 6N5 Canada

ISBN: (纸本)9780769528250

This paper presents a hybrid Id motion estimation algorithm which combines pixel-based and region-based approaches that can give depth images from translational video sequences with very high quality. Firstly, we combine the motion information estimated by a variational regularization approach and by the Gabor transform through histogram analysis to identify those regions with zero motion (like for the sky). Then another round of region matching is carried out to refine the motion values for the other regions. Our algorithm can detect most of the sky regions segmented by foreground objects with complex geometry while keeping the boundaries of moving objects sharp and clear, which is an very important feature to obtain accurate 3d models. The high quality motion maps/depth images obtained by our algorithm are shown along with 3d reconstructions from novel viewpoints.

关键词： Three dimensional computer graphics

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A mobile augmented reality system with distributed tracking

A mobile augmented reality system with distributed tracking

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3rd international symposium on 3d data processing, visualization and transmission

作者： Evers-Senne, J. -F. Schiller, I. Petersen, A. Koch, R. Univ Kiel Inst Comp Sci D-24103 Kiel Germany

ISBN: (纸本)9780769528250

For AR applications the 3d position and direction of the users view have to be determined in real time. At the same time, the augmentation, one or more 3d objects, have to be rendered. This article describes a distributed mobile AR-System designed for industrial service applications. By distributing the different tasks involved in AR, the computational load of the portable system can be minimized such that a small and lightweight computer can be used. The portable computer is connected to a backend server via WLAN. Minimisation of the bandwidth usage of the system ensures that 20 or more systems can operate on one standard WLAN access point. The main focus of this article is to minimise the computational load of the mobile system and the network load simultaneously.

关键词： Augmented reality

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Statistical inference of biological structure and point spread functions in 3d microscopy

Statistical inference of biological structure and point spre...

引用

3rd international symposium on 3d data processing, visualization and transmission

作者： Schlecht, Joseph Barnar, Kobus Pryor, Barry Univ Arizona Dept Comp Sci Tucson AZ 85721 USA Univ Arizona Dept Plant Sci Tucson AZ 85721 USA

ISBN: (纸本)9780769528250

We present a novel method for detecting and quantifying 3d structure in stacks of microscopic images captured at incremental focal lengths. We express the image data as stochastically generated by an underlying model for biological specimen and the effects of the imaging system. The method simultaneously fits a model for proposed structure and the imaging system's parameters, which include a model of the point spread function. We demonstrate our approach by detecting spores in image stacks of Alternaria, a microscopic genus of fungus. The spores are modeled as opaque ellipsoids and fit to the data using statistical inference. Since the number of spores in the data is not known, model selection is incorporated into the fitting process. Thus, we develop a reversible jump Markov chain Monte Carlo sampler to explore the parameter space. Our results show that simultaneous statistical inference of specimen and imaging models is useful for quantifying biological structures in 3d microscopic images. In addition, we show that inferring a model of the imaging system improves the overall fit of the specimen model to the data.

关键词： Imaging systems

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rdTC optimized streaming for remote browsing in image-based scene representations

RDTC optimized streaming for remote browsing in image-based ...

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3rd international symposium on 3d data processing, visualization and transmission

作者： Bauermann, Ingo Peng, Yang Steinbach, Eckehard Tech Univ Munich Inst Commun Networks Media Technol Grp D-8000 Munich Germany

ISBN: (纸本)9780769528250

Remote navigation in compressed image-based scene representations requires random access to arbitrary parts of the reference image data to recompose virtual views. The degree of inter-frame dependencies exploited during compression has an impact on the effort needed to access reference images and delimits the rate distortion (rd) trade-off that can be achieved. If, additionally, a given receiver hardware and a maximum available channel bitrate is taken into account, the traditional rate-distortion optimization is extended to an rdTC trade-off between rate (R), distortion (d), transmission data rate (T), and decoding complexity (C). In this work we introduce our rdTC optimized compression framework. Ln addition, an experimental testbed for streaming of these rdTC optimally compressed image-based scene representations is described and the impact of client side caching is investigated. Our results show a significant reduction in user perceived delay for rdTC optimized streams in such a remote browsing environment compared to rd optimized or independently encoded scene representations.

关键词： Electric distortion

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Extracting 3d shape features in discrete scale-space

Extracting 3D shape features in discrete scale-space

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3rd international symposium on 3d data processing, visualization and transmission

作者： Novatnack, John Nishino, Ko Shokoufandeh, Ali Drexel Univ Dept Comp Sci Philadelphia PA 19104 USA

ISBN: (纸本)9780769528250

3d shape features are inherently scale-dependent. For instance, on a 3d model of a human body, the top of the head and a fingertip can both be detected as comer points, however, at entirely different scales. In this paper, we present a method for extracting and integrating 3d shape features in the discrete scale-space of a triangular mesh model. We first parameterize the surface of the mesh model on a 2d plane and then construct a dense surface normal map. In general, the parametrization is not isometric. To account for this, we compute the relative stretch of the original edge lengths. Next, we compute a dense distortion map which is used to approximate the geodesic distances on the normal map. Then, we construct a discrete scale-space of the original 3d shape by successively convolving the normal map with distortion-adapted Gaussian kernels of increasing standard deviation. We derive comer and edge detectors to extract 3d features at each scale in the discrete scale-space. Furthermore, we show how to combine the detector responses from different scales to form a unified representation of the 3d features.

关键词： Edge detection

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Global depth from epipolar volumes - A general framework for reconstructing non-lambertian surfaces

Global depth from epipolar volumes - A general framework for...

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3rd international symposium on 3d data processing, visualization and transmission

作者： Stich, Timo Tevs, Art Magnor, Marcus Tech Univ Carolo Wilhelmina Braunschweig Comp Graph Lab D-3300 Braunschweig Germany MPI Informat Saarbrucken Germany

ISBN: (纸本)9780769528250

Using Epipolar Image Analysis in the context of the correspondence finding problem in depth reconstruction has several advantages. One is the elegant incorporation of prior knowledge about the scene or the surface reflection properties into the reconstruction process. The proposed framework in conjunction with graph cut optimization is able to reconstruct also highly specular surfaces. The use of prior knowledge and multiple images opens new ways to reconstruct surfaces and scenes impossible or error prone with previous methods. Another advantage is improved occlusion handling. Pixels that are partly occluded contribute to the reconstruction results. The proposed shifting of some of the computation to graphics hardware (GPU) results in a significant speed improvement compared to pure CPU-based implementations.

关键词： Graphic methods

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