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

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Real time transmission of images and data through underwater acoustic channel - The TRIdENT system

Real time transmission of images and data through underwater...

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IEEE international Geoscience and Remote Sensing symposium

作者： Trubuil, J Lapierre, G Labat, J ENST Bretagne F-29238 Brest 3 France

ISBN: (纸本)0780387422

Underwater acoustic communication current needs are increasing . Civil and military applications are large. In this context, GESMA (Groupe d'Etudes Sous-Marines de l'Atlantique), initiated the Project TRIdENT (transmission d'Images et de donnees EN Temps reel). Project objective, e is to develop a high data rate link allowing the transmission of Various information (text, images...). A real-time receiver platform, using a digital Signal Processor (dSP) and based on a spatio-temporal equalizer developed and patented by ENST Bretagne, was carried out to reduce the various perturbations brought by the underwater acoustic channel (UWA). Sea trials, realized in 2002 and 2003, permitted to validate the receiver platform. The different results show the robustness of the TRIdENT system for transmission in a strongly disturbed channel. The TRIdENT system allows data transmissions with a bit data rate ranging from 8 to 25 kbps for distances higher than 2000 meters.

关键词： underwater vehicles geophysical signal processing underwater acoustic communication hydrophones image/data transmission underwater acoustic channel TRIdENT system civil/military application GESMA Groupe d'Etudes Sous-Marines de l'Atlantique TRIdENTsystem transmission d'Images et de donnees EN Temps reel project objective real-time receiver platform digital Signal Processor dSP spatio-temporal equalizer ENST Bretagne sea trial Ad 2002 to 2003 bit data rate underwater acoustic communication Underwater Acoustic Channels project objective Ship trials Hydrophones geophysical signal processing underwater vehicles digital signal processors

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data-driven approaches to digital human modeling

Data-driven approaches to digital human modeling

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international symposium on 3d data processing visualization and transmission

作者： N. Magnenat-Thalmann H. Seo MIRALaboratory University of Genova Geneve Switzerland

data-driven approach is an appealing way to depict people in a virtual world. The captured shape and movement data from real people are structured and combined to reproduce or create new samples in an intuitive and controllable way. We focus on the body shape modeling and elucidate the issues related to data-driven methods. The difficulty of adopting data-driven approach for human body shape modeling is due in part to the intrinsic articulated structure of the body. Since such internal structure is not measured with most of existing capture devices available today, it has to be calculated through estimation. We develop a framework for collecting and managing range scan data that automatically estimates this structure from user-tagged landmarks. By framing the captured and structurally annotated data so that statistic implicit is exploited for synthesizing new body shapes, our technique support time-saving generation of animatable body models with high realism.

关键词： Humans Biological system modeling Animation Shape control Speech synthesis Computer graphics Character generation Statistics deformable models Focusing

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Hierarchical 3d surface reconstruction based on radial basis functions

Hierarchical 3D surface reconstruction based on radial basis...

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international symposium on 3d data processing visualization and transmission

作者： P. dalmasso R. Nerino Istituto Electtrotecnico Nazionale Galileo Ferraris Torino Italy

Volumetric methods based on implicit surfaces are commonly used in surface reconstruction from uniformly distributed sparse 3d data. The case of nonuniform distributed data has recently deserved more attention, because it occurs frequently in practice. This work describes a volumetric approach to surface reconstruction from nonuniform data which is suitable for the reconstruction of surfaces from images, in particular from multiple views. differently from volumetric methods which use both 3d surface points and surface normals, the approach does not use the surface normals because they are often unreliable when estimated from image data. The method is based on a hierarchical partitioning of the volume data set. The working volume is split and classified at different scales of spatial resolution into surface, internal and external voxels and this hierarchy is described by an octree structure in a multiscale framework. The octree structure is used to build a multiresolution description of the surface by means of compact support radial basis functions (RBF). A hierarchy of surface approximations at different levels of details is built by representing the voxels at the same octree level as RBF of similar spatial support. At each scale, information related to the reconstruction error drives the reconstruction process at the following finer scale. Preliminary results on synthetic data and future perspectives are presented.

关键词： Surface reconstruction Image reconstruction Spatial resolution Least squares approximation Computer errors Computer vision Computer graphics Application software Layout Active noise reduction

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Realistic models of children heads from 3d-MRI segmentation and tetrahedral mesh construction

Realistic models of children heads from 3D-MRI segmentation ...

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international symposium on 3d data processing visualization and transmission

作者： J. Burguet N. Gadi I. Bloch Department TSI-CNRS UMR 5141 LTCI Ecole Nationale Superieure des Télécommunications Paris France

In order to analyze the sensitivity of children to RF fields and mobile phones in particular, the SAR (specific absorption ratio) defined as the power absorbed by a unit of mass of tissues (W/kg) should be computed based on a numerical model of the head. We propose to build realistic models from 3d-MRI of children heads. The method is composed of two steps. The first one consists in segmenting the main tissues in these images (skin, fat, muscles, cortical and marrow bones, cerebrospinal fluid, grey and white matter, blood, etc.). The segmentation is based on mathematical morphology methods which are well adapted to this aim and provide a robust and automatic method requiring minimum user intervention. Using simplified segmented images, the second step concerns the tetrahedral mesh generation. Our method uses almost regular meshes and topological tools to preserve the topological arrangement of the head tissues. A method to guarantee a good geometrical quality is also provided.

关键词： Head Image segmentation Radio frequency Mobile handsets Specific absorption rate Numerical models Skin Muscles Bones Blood

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Speech-driven face synthesis from 3d video

Speech-driven face synthesis from 3D video

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international symposium on 3d data processing visualization and transmission

作者： I.A. Ypsilos A. Hilton A. Turkmani P.J.B. Jackson Centre for Vision Speech and Signal Processing University of Surrey Guildford UK

We present a framework for speech-driven synthesis of real faces from a corpus of 3d video of a person speaking. Video-rate capture of dynamic 3d face shape and colour appearance provides the basis for a visual speech synthesis model. A displacement map representation combines face shape and colour into a 3d video. This representation is used to efficiently register and integrate shape and colour information captured from multiple views. To allow visual speech synthesis viseme primitives are identified from the corpus using automatic speech recognition. A novel nonrigid alignment algorithm is introduced to estimate dense correspondence between 3d face shape and appearance for different visemes. The registered displacement map representation together with a novel optical flow optimisation using both shape and colour, enables accurate and efficient nonrigid alignment. Face synthesis from speech is performed by concatenation of the corresponding viseme sequence using the nonrigid correspondence to reproduce both 3d face shape and colour appearance. Concatenative synthesis reproduces both viseme timing and co-articulation. Face capture and synthesis has been performed for a database of 51 people. Results demonstrate synthesis of 3d visual speech animation with a quality comparable to the captured video of a person.

关键词： Speech synthesis Facial animation Shape Face detection Image reconstruction Image motion analysis Production Signal synthesis Optical films Optical sensors

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Venus subsurface ionosphere radar sounder: VENSIS

Venus subsurface ionosphere radar sounder: VENSIS

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international symposium on 3d data processing visualization and transmission

作者： d. Biccari d. Calabrese d. Gurnett R. Huff L. Marinangeli R. Jordan E. Nielsen G.G. Ori G. Picardi J. PIaut F. Provvedi R. Seu E. Zampolini Infocom Dpt. Univ. of Rome “La Sapienza” Rome Italy Alenia Aereospazio Rome Italy Physics and Astronomy Dpt. Univ. of Iowa USA International Research School of Planetary Sciences Pescara Italy Int'l Research School of Planetary Sciences Pescara Italy USA Max Planck Institute for Aeronomie-Lindau Germany

The main features of the VENSIS radar in the VENUS EXPRESS mission are shown and the expected subsurface and ionosphere sounding performance have been discussed, according to the models of the Venus crust composition, geometric structure and ionosphere environment. VENSIS complements Magellan data of the surface and subsurface of Venus by using long wavelength sounding radar to probe the third dimension of the Venusian crust. Ionosphere sounding improves new unique data in the solar wind interactions with the planet, and is used to monitor the atmosphere for lightning.

关键词： Venus Ionosphere Radar Solid modeling Surface waves Probes Planets Monitoring Atmosphere Lightning

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5th international symposium on Biological and Medical data Analysis, ISBMdA 2004

5th International Symposium on Biological and Medical Data A...

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5th international symposium on Biological and Medical data Analysis, ISBMdA 2004

ISBN: (纸本)9783540305477

The proceedings contain 50 papers. The special focus in this conference is on data Analysis for Image processing, data visualization and decision Support Systems. The topics include: RF inhomogeneity correction algorithm in magnetic resonance imaging;fully 3d wavelets MRI compression;a new approach to automatic segmentation of bone in medical magnetic resonance imaging;an accurate and parallelizable geometric projector/backprojector for 3d PET image reconstruction;EEG data and data analysis visualization;a web information system for medical image management;reliable space leaping using distance template;a rule-based knowledge system for diagnosis of mental retardation;case-based diagnosis of dysmorphic syndromes;bayesian prediction of down syndrome based on maternal age and four serum markers;a distributed decision support architecture for clinical diagnosis;decision support server architecture for mobile medical applications;ordered time-independent CIG learning;on the robustness of feature selection with absent and non-observed features;design of a neural network model as a decision making aid in renal transplant;learning the dose adjustment for the oral anticoagulation treatment;thermal medical image retrieval by moment invariants;employing maximum mutual information for bayesian classification;a structural hierarchical approach to longitudinal modeling of effects of air pollution on health outcomes;replacing indicator variables by fuzzy membership functions in statistical regression models and PCA representation of ECG signal as a useful tool for detection of premature ventricular beats in 3-channel holter recording by neural network and support vector machine classifier.

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A Vrml97-X3d extension for massive scenery management in virtual worlds 04

A Vrml97-X3D extension for massive scenery management in vir...

引用

Proceedings - 9th international Conference on 3d Web Technology

作者： Marvie, Jean-Eudes Bouatouch, Kadi University of Rennes France

ISBN: (纸本)9781581138450

In this paper we present a VRML97-X3d extension to describe precomputed visibility relationships in the context of progressive transmission as well as real time visualization of massive 3d sceneries. The extension we propose can be used to describe cell-to-cell, cell-to-objects as well as hybrid visibility relationships using a generic cell representation. Thanks to these relationships it is possible to represent indoor and outdoor sceneries using the same VRML97-X3d representation. We also present some new mechanisms that allow to perform instance sharing of objects described into separate files. These mechanisms allow to minimize the size of the set of VRML97-X3d files that are used for the database description as well as the amount of main memory required on the client side to visualize the scenery. In addition to these new mechanisms we also explain how we manage the memory on the client side and how we perform data pre-fetching according to the viewpoint movements. Finally we present several tests performed on different kinds of sceneries such as city and architectural models.

关键词： Virtual reality

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Interactive walkthroughs using "morphable 3d-mosaics"

Interactive walkthroughs using "morphable 3D-mosaics"

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international symposium on 3d data processing visualization and transmission

作者： N. Komodakis G. Pagonis G. Tziritas Computer Science Department University of Crete Heraklion Greece

This work presents a hybrid (geometry- & image-based) technique suitable for providing interactive walkthroughs of large, complex outdoor scenes. Motion is restricted along a smooth predefined path and the input to the system is a sparse set of stereoscopic views at certain points (key-positions) along that path (one view per position). An approximate local 3d model is constructed from each view, capable of capturing photometric and geometric properties of the scene only locally. Then during the rendering process, a continuous morphing (both photometric & geometric) takes place between successive local 3d models, using what we call a "morphable 3d-model". The morphing proceeds in a physically-valid way. For this reason, a wide-baseline image matching technique is proposed, handling cases where the wide baseline between the two images is mainly due to a looming of the camera. Our system can be extended in the event of multiple stereoscopic views (and therefore multiple local models) per key-position of the path (related by a camera rotation). In that case one local 3d-mosaic (per key-position) is constructed comprising all local 3d models therein and a "morphable 3d-mosaic" is used during the rendering process. A partial-differential equation is adopted to handle the problem of geometric consistency of each 3d-mosaic.

关键词： Layout Solid modeling Photometry Rendering (computer graphics) Cameras Large-scale systems Image matching Computer science Equations Computer graphics

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3d reconstruction of natural scenes with view-adaptive multi-texturing

3D reconstruction of natural scenes with view-adaptive multi...

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international symposium on 3d data processing visualization and transmission

作者： K. Mueller A. Smolic P. Merkle B. Kaspar P. Eisert T. Wiegand Image Processing Department Fraunhofer Institute for Telecommunications (Heinrich Hertz Institut) Berlin Germany

We present a 3d reconstruction and modeling system that operates on a number of input photographs that show a natural scene. Approaches from computer graphics and image processing are combined and performance is shown via experiments. Furthermore, reconstruction quality is analyzed w.r.t. the number and distribution of textures, used for reconstruction. The reconstruction pipeline starts with image acquisition, which consists of a number of photographs of the scene that are sequentially taken at different positions. Since the photographs are not acquired concurrently, they are influenced by different illumination conditions that we mandate to be preserved in the final 3d representation. In the second step, object segmentation is applied and camera calibration provided. This allows the application of shape-from-silhouette approaches, namely a hierarchical voxel approach, where different resolution layers are organized within an octree structure. For applying texture mapping, the voxel model is transformed into a wireframe, which provides smoothing of the object's surface and also reduces the number of surface primitives. Finally, a subset of original images is mapped onto the 3d geometry to provide texture information. Here, view-adaptive multi-texturing is used to preserve natural illumination. Intermediate views are interpolated automatically using adaptive real-time weight calculations for original textures.

关键词： Layout Image reconstruction Lighting Surface texture Computer graphics Image processing Image texture analysis Pipelines Object segmentation Cameras

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