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4th international symposium on 3d data processing, visualization and transmission, 3dpvt 2008 - Proceedings

4th International Symposium on 3D Data Processing, Visualiza...

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4th international symposium on 3d data processing, visualization and transmission, 3dpvt 2008

the proceedings contain 45 papers. the topics discussed include: fast simultaneous tracking and recognition using incremental keypoint matching;visual word based location recognition in 3d models using distance augmented weighting;expression-invariant non-rigid 3d face recognition: a robust approach to expression-aware morphing;think globally, cluster locally: a unified framework for range segmentation;estimation of euler characteristic from volumetric data;optimized camera ranking algorithms for real-time image based rendering of endoscopic image data;directional associative Markov network for 3-d point cloud classification;temporal styles for time-varying volume data;stride scheduling for time-critical collision detection;and capturing a surface light field under virtual illumination.

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An efficient and memory-conserving implementation of multi-view stereo for wide-area reconstruction 4

An efficient and memory-conserving implementation of multi-v...

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4th international symposium on 3d data processing, visualization and transmission, 3dpvt 2008

作者： Zabulis, Xenophon Grammalidis, Nikos Floros, Georgios d.

this paper deals with the automatic stereo reconstruction of wide-area scenes. Its particular goal is a computationally efficient method that can be performed on a personal computer, despite the large amount of data involved in the reconstruction of wide-area scenes. Robustness is considered in terms of the accuracy of the final reconstruction, as well as, in the context of simplifying the image acquisition process for the end-user. © 2008 Georgia Institute of Technology.

关键词： Personal computers

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Visual word based location recognition in 3d models using distance augmented weighting 4

Visual word based location recognition in 3D models using di...

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4th international symposium on 3d data processing, visualization and transmission, 3dpvt 2008

作者： Fraundorfer, Friedrich Wu, Changchang Frahm, Jan-Michael Pollefeys, Marc Department of Computer Science ETH Zürich Switzerland Department of Computer Science UNC Chapel HillNC United States

For visual word based location recognition in 3d models we propose a novel distance-weighted scoring scheme. Matching visual words are not treated as perfect matches anymore but are weighted with the distance of the original SIFT feature vectors before quantization. To maintain the scalability and efficiency of vocabulary tree based approaches PCA compressed SIFT feature vectors are used instead of the original SIFT features. A different eigenspace is computed for each vocabulary tree cell to benefit from the variance reduction as result of the partitioned SIFT feature space. Experiments show a significant improvement in retrieval quality by incorporating the distance with small costs in computational time and memory. © 2008 Georgia Institute of Technology.

关键词： data visualization

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Temporal styles for time-varying volume data 4

Temporal styles for time-varying volume data

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4th international symposium on 3d data processing, visualization and transmission, 3dpvt 2008

作者： Balabanian, Jean-Paul Viola, Ivan Möller, Torsten Gröller, Eduard University of Bergen Norway Simon Fraser University Canada Vienna University of Technology Austria

this paper introduces interaction mechanisms for conveying temporal characteristics of time-varying volume data based on temporal styles. We demonstrate the flexibility of the new concept through different temporal style transfer function types and we define a set of temporal compositors as operators on them. the data is rendered by a multi-volume GPU raycaster that does not require any grid alignment over the individual time-steps of our data nor a rectilinear grid structure. the paper presents the applicability of the new concept on different data sets from partial to full voxel alignment with rectilinear and curvilinear grid layout. © 2008 Georgia Institute of Technology.

关键词： Conveying

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Expression-invariant non-rigid 3d face recognition: A robust approach to expression-aware morphing 4

Expression-invariant non-rigid 3D face recognition: A robust...

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4th international symposium on 3d data processing, visualization and transmission, 3dpvt 2008

作者： Al-Osaimi, F.R. Bennamoun, M. Mian, A.

An automatic approach to the recognition of 3d face under any facial expression is presented. It has the capacity to differentiate between expression deformations, those which are caused by expressions, and interpersonal disparities that are essential for recognition. When two facial scans are matched the expression deformations are morphed out before similarity measure calculation while the interpersonal disparities are retained. A combination of PCA and ICP is used in our system. the PCA subspace is built in such a way it models the facial expressions while it does not model the human face. the approach was applied on the FRGC v2.0 dataset and superior recognition performance was achieved. the verification rates at 0.001 FAR were 98.35% and 97.73% for scans under neutral and non-neutral expressions, respectively. © 2008 Georgia Institute of Technology.

关键词： Face recognition

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the efficient extension of globally consistent scan matching to 6 doF 4

The efficient extension of globally consistent scan matching...

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4th international symposium on 3d data processing, visualization and transmission, 3dpvt 2008

作者： Borrmann, dorit Elseberg, Jan Lingemann, Kai Nüchter, Andreas Hertzberg, Joachim University of Osnabrück Knowledge-Based Systems Research Group Albrechtstraße 28 OsnabrückD-49069 Germany

Over ten years ago, Lu and Milios presented a probabilistic scan matching algorithm for solving the simultaneous localization and mapping (SLAM) problem with 2d laser range scans, a standard in robotics. this paper presents an extension to this GraphSLAM method. Our iterative algorithm uses a sparse network to represent the relations between several overlapping 3d scans, computes in every step the 6 degrees of freedom (doF) transformation in closed form and exploits efficient data association with cached k-d trees. Our approach leads to globally consistent 3d maps, precise 6d pose and covariance estimates, as demonstrated by various experimental results. © 2008 Georgia Institute of Technology.

关键词： Robotics

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Automatic 3d video summarization: Key frame extraction from self-similarity 4

Automatic 3D video summarization: Key frame extraction from ...

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4th international symposium on 3d data processing, visualization and transmission, 3dpvt 2008

作者： Huang, Peng Hilton, Adrian Starck, Jonathan Centre for Vision Speech and Signal Processing University of Surrey GuildfordGU2 7XH United Kingdom

In this paper we present an automatic key frame selection method to summarise 3d video sequences. Key-frame selection is based on optimisation for the set of frames which give the best representation of the sequence according to a rate-distortion trade-off. distortion of the summarization from the original sequence is based on measurement of self-similarity using volume histograms. the method evaluates the globally optimal set of key-frames to represent the entire sequence without requiring pre-segmentation of the sequence into shots or temporal correspondence. Results demonstrate that for 3d video sequences of people wearing a variety of clothing the summarization automatically selects a set of key-frames which represent the dynamics. Comparative evaluation of rate-distortion characteristics with previous 3d video summarization demonstrates improved performance. © 2008 Georgia Institute of Technology.

关键词： Economic and social effects

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Optimized camera ranking algorithms for real-time image based rendering of endoscopic image data 4

Optimized camera ranking algorithms for real-time image base...

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4th international symposium on 3d data processing, visualization and transmission, 3dpvt 2008

作者： Winter, Marco then, Bernhard Greiner, Günther Computer Graphics Group University of Erlangen-Nuremberg Am Weichselgarten 9 Erlangen91058 Germany

Unstructured Lumigraph Rendering is a well-established and flexible image-based rendering technique to create novel views from a set of acquired images. However, the standard implementation may not provide a pleasing visualization when images are captured under suboptimal conditions. In our scenario, lightfield information is gained using images from endoscopes that observe the operating field during minimal-invasive surgery. Suboptimal lighting conditions and limited mobility of the endoscope lead to visual artefacts in the final visualization of the scene. To resolve these problems, we propose a set of new algorithms for computing the ranking criterions that are used by the Unstructured Lumigraph for visualization. Using these algorithms, we get satisfying results for visualization of endoscopic image data captured under the aforementioned conditions. To achieve real-time visualization, the vital parts of our algorithms have been implemented using OpenGL and GLSL, thus making use of the features and speed of modern graphics hardware. © 2008 Georgia Institute of Technology.

关键词： visualization

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A curvature-driven probabilistic strategy for transmission of arbitrary 3d meshes over unreliable networks 4

A curvature-driven probabilistic strategy for transmission o...

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4th international symposium on 3d data processing, visualization and transmission, 3dpvt 2008

作者： Cheng, Irene Ying, Lihang daniilidis, Kostas Department of Information and Computer Science University of Pennsylvania United States Department of Computing Science University of Alberta Canada

Packet loss affects the receiving quality of 3d meshes transmitted over unreliable networks. While some applications are able to tolerate higher loss, others may need to restrict the loss below a specified level. In this work we describe a curvature-driven probabilistic strategy to control the adverse impact of packet loss. Critical mesh features, with high curvature, like sharp edges and corners are allocated more bandwidth to increase the rate of their successful transmission. When the probability of visual degradation caused by lost critical features exceeds an acceptable level, a group of curvature indices is added to the transmission pipeline and stored in packets different from those containing the critical features. the size of the indices is governed by three parameters: the mesh resolution, the minimum required quality and the tolerance. We incorporate this new strategy with an earlier interleaved transmission approach. Experimental results show that the reconstructed meshes using the integrated strategy have higher visual quality. © 2008 Georgia Institute of Technology.

关键词： Packet loss

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3d-model view characterization using equilibrium planes 4

3D-model view characterization using equilibrium planes

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4th international symposium on 3d data processing, visualization and transmission, 3dpvt 2008

作者： theetten, Adrien Ansary, Tarik Filali Vandeborre, Jean-Philippe University of Lille 1 France Institut TELECOM TELECOM Lille 1 France

We propose a new method for 3d-mesh model characteristic view selection. It consists in using the views that come from the equilibrium states of a 3d-model: they correspond to the horizontal plane on which an object is statically laying under the effect of gravity. the selected views are then very intuitive for the user. Indeed, to present a query, the user will take a photo or draw a sketch of the object on a table or on a floor, putting thus the object in a static mechanical equilibrium. Consequently, our view selection method follows the same principles: finding all the equilibrium planes of an object and obtaining their relative 2d views. We present the experiments and results of our method on the Princeton 3d Shape Benchmark database using a collection of 50 images (photos, sketches, etc.) as queries, showing the performance of our method in 3d retrieval from photos. © 2008 Georgia Institute of Technology.

关键词： Query processing

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