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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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Multiresolution interactive modeling with efficient visualization

Multiresolution interactive modeling with efficient visualiz...

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international Conference on 3d Imaging, Modeling, processing, visualization and transmission (3dIMPVT)

作者： J.-d. deschenes P. Hebert P. Lambert J.-N. Ouellet d. Tubic Computer Vision and Systems Laboratory Laval University Quebec Canada

3d interactive modeling from range data aims at simultaneously producing and visualizing the surface model of an object while data is collected. The current research challenge is producing the final result in real-time. Using a recently proposed framework, a surface model is built in a volumetric structure encoding a vector field in the neighborhood of the object surface. In this paper, it is shown that the framework allows one to locally control the model resolution during acquisition. Using ray tracing, efficient visualization approaches of the multiresolution vector field are described and compared. More precisely, it is shown that volume traversal can be optimized while preventing holes and reducing aliasing in the rendered image.

关键词： Surface reconstruction Image reconstruction data visualization Encoding Rendering (computer graphics) Sampling methods Clouds Computer vision Laboratories Ray tracing

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Proceedings - 2nd international symposium on 3d data processing, Vicualization, and transmission. 3dPVT2004: Foreword

Proceedings - 2nd International Symposium on 3D Data Process...

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Proceedings - 2nd international symposium on 3d data processing, visualization, and transmission. 3dPVT 2004

作者： Aloimonos, Yiannis Taubin, Gabriel

No abstract available

ISBN: (纸本)0769522238

No abstract available

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Quality evaluation of fast morphing interpolation model for 3d volume reconstruction

Quality evaluation of fast morphing interpolation model for ...

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IEEE international symposium on Signal processing and Information Technology (ISSPIT)

作者： A. Fadeev N. Eltonsy G. Tourassi A. Elmaghraby Physics Department University of Louisville Louisville KY USA Computer Engineering and Computer Science University of Louisville Louisville KY USA Department of Radiology Duke University Medical Center Durham NC USA

The purpose of this study is to evaluate a 3d volume reconstruction model for volume rendering. The model is conducted using brain MRI data of Visible Human Project. Particularly MRI T1 data were used. The quality of the developed model is compared with linear interpolation technique. By applying our morphing technique recursively, taking progressively smaller subregions within a region, a high quality and accuracy interpolation is obtained. The presented algorithm is robust and has 20 adjustable parameters for use with different modalities. The main advantages of this morphing algorithm are: 1) applicability to general configurations of planes in 3d space, 2) automated behavior, 3) applicability to CT scans with no changes in the algorithm and software. Subsequently, to visualize data, a specialized volume rendering card (TeraRecon VolumePro 1000) was used. To represent data in 3d space, special software was developed to convert interpolated CT slices to 3d objects compatible with the VolumePro card. Quantitative and visual comparison between the proposed model and linear interpolation clearly demonstrates the superiority of the proposed model. Evaluation is performed by removing slices from the original stack of 2d images and using them as reference for error comparison among alternative approaches. Error analysis using average Mean Square and Absolute error clearly demonstrates improved performance

关键词： Interpolation Image reconstruction Magnetic resonance imaging Software algorithms Computed tomography Brain modeling Humans Robustness data visualization Image converters

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The Planar: a mobile VR tool with pragmatic pose estimation for generation and manipulation of 3d data in industrial environments

The Planar: a mobile VR tool with pragmatic pose estimation ...

引用

international Conference on 3d Imaging, Modeling, processing, visualization and transmission (3dIMPVT)

作者： R. Schoenfelder J. Baur F. Spenling DaimlerChrysler Aerospace Ulm Germany Bauhaus University Weimar Germany Germany

We present the prototype of the Planar, a novel input/output device designed for applications in task areas focusing on the generation and manipulation of 3d data, e.g. CAd or styling. Technically, the Planar offers a spatially aware pen-sensitive display, mounted on an adjustable, scooter-like autonomous platform. The movable screen, with 6 degrees of freedom, can act like a window into 3d virtual environments and allows for efficient 2d and 3d interaction at the same time. We report on the pose estimation system of the Planar's display where we focus on two enhanced optical mice combined to track horizontal 2d position/orientation. Results of this pragmatic approach are presented and discussed. In order to demonstrate the potential of the Planar we show a small review/sketching/annotation application. The overall goal of this work is to contribute to the development of real VR applications.

关键词： Virtual reality design automation Navigation Prototypes Virtual environment Two dimensional displays Mice Electrical equipment industry visualization Control systems

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Construction of regular 3d point clouds using octree partitioning and resampling

Construction of regular 3D point clouds using octree partiti...

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IEEE international symposium on Circuits and Systems (ISCAS)

作者： Jae-Young Sim Sang-Uk Lee Chang-Su Kim School of Electrical Engineering and Computer Science Seoul National University Seoul South Korea Department of Information Engineering Chinese University of Hong Kong Sha Tin Hong Kong China

ISBN: (纸本)0780388348

We propose a construction algorithm of regular 3d point clouds from irregular ones. An irregular point cloud is partitioned hierarchically using an octree, and the points in each octree node are projected onto a square face, called a base plane, of the cubic node. The geometry of the point cloud is then represented by the height fields on the base planes. The height fields are interpolated and then resampled uniformly on the base plane. Consequently, the original geometry is represented by the scalar height fields, each of which is defined at uniform grid points on a square region. Therefore, the resulting geometry can be easily processed by conventional 2d image processing techniques.

关键词： Clouds Partitioning algorithms Rendering (computer graphics) Geometry Surface reconstruction Image processing data visualization Image coding Computer science Virtual reality

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Spatio-temporal fusion of multiple view video rate 3d surfaces

Spatio-temporal fusion of multiple view video rate 3D surfac...

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international Conference on 3d Imaging, Modeling, processing, visualization and transmission (3dIMPVT)

作者： G. Collins A. Hilton Centre of Speech Vision and Signal Processing University of Surrey UK

We consider the problem of geometric integration and representation of multiple views of non-rigidly deforming 3d surface geometry captured at video rate. Instead of treating each frame as a separate mesh we present a representation which takes into consideration temporal and spatial coherence in the data where possible. We first segment gross base transformations using correspondence based on a closest point metric and represent these motions as piecewise rigid transformations. The remaining residual is encoded as displacement maps at each frame giving a displacement video. At both these stages occlusions and missing data are interpolated to give a representation which is continuous in space and time. We demonstrate the integration of multiple views for four different non-rigidly deforming scenes: hand, face, cloth and a composite scene. The approach achieves the integration of multiple-view data at different times into one representation which can processed and edited.

关键词： Geometry Layout Surface treatment Space technology Extraterrestrial measurements Iterative closest point algorithm Speech processing Video signal processing Spatial coherence Sensor systems

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Compression of fMRI and ultrasound images using 4d SPIHT

Compression of fMRI and ultrasound images using 4D SPIHT

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IEEE international Conference on Image processing

作者： H.G. Lalgudi A. Bilgin M.W. Marcellin M.S. Nadar Electrical and Computer Engineering University of Arizona Tucson Tucson AZ USA Imaging and Visualization Department Siemens AG Corporate Research and Development Princeton NJ USA

There is increased use of medical imaging techniques that produce four dimensional (4d) datasets such as fMRI and 3d dynamic echocardiograms. These datasets consume even larger amounts of resources for transmission or storage compared to the traditional 2d data sets. In this paper, we extend the zero tree algorithms, EZW (embedded zero tree coding of wavelet coefficients) and SPIHT (set partitioning in hierarchical trees) to 4d to compress the 4d datasets more efficiently. Integer to integer wavelet transforms scaled by appropriate subband energy weights are used to get lossy to lossless compression. We also investigate the effects of lossy compression on the end result of fMRI analysis.

关键词： Image coding Ultrasonic imaging Magnetic resonance imaging Tree data structures Magnetic analysis Testing Biomedical engineering data engineering data visualization Biomedical imaging

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detecting cylinders in 3d range data using model selection criteria

Detecting cylinders in 3D range data using model selection c...

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international Conference on 3d Imaging, Modeling, processing, visualization and transmission (3dIMPVT)

作者： N. Gheissari A. Bab-Hadiashar Faculty of Engineering and Industrial Sciences Swinburne University of Technology Hawthorn VIC Australia

In this paper, we use a model selection criterion to decide whether two cylinders should be merged as a single cylinder or they should be left separated. We compare and evaluate an extensive number of different model selection criteria for this purpose and examine which factors can affect their performance. We conclude that SSC, GIC, MCAIC and CAIC have a better performance (for this particular application) compared to the other criteria.

关键词： Engine cylinders Application software Computer vision Australia Surface fitting digital images Predictive models Mathematical model

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3d modeling of outdoor environments by integrating omnidirectional range and color images

3D modeling of outdoor environments by integrating omnidirec...

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international Conference on 3d Imaging, Modeling, processing, visualization and transmission (3dIMPVT)

作者： T. Asai M. Kanbara N. Yokoya Nara Institute of Science and Technology Nara Japan

This paper describes a 3d modeling method for wide area outdoor environments which is based on integrating omnidirectional range and color images. In the proposed method, outdoor scenes can be efficiently digitized by an omnidirectional laser rangefinder which can obtain a 3d shape with high-accuracy and by an omnidirectional multi-camera system (OMS) which can capture a high-resolution color image. Multiple range images are registered by minimizing the distances between corresponding points in the different range images. In order to register multiple range images stably, points on plane portions detected from the range data are used in registration process. The position and orientation acquired by RTK-GPS and gyroscope are used as initial values of simultaneous registration. The 3d model obtained by registration of range data is mapped by textures selected from omnidirectional images in consideration of the resolution of texture and occlusions of the model. In experiments, we have carried out 3d modeling of our campus with the proposed method.

关键词： Color Shape measurement Iterative closest point algorithm Laser modes Image reconstruction Sensor systems Position measurement Layout Laser theory Gyroscopes

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Multisensor fusion for volumetric reconstruction of large outdoor areas

Multisensor fusion for volumetric reconstruction of large ou...

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international Conference on 3d Imaging, Modeling, processing, visualization and transmission (3dIMPVT)

作者： M. Fiocco G. Bostrom J.G.M. Goncalves V. Sequeira European Commissio Joint Research Centre Ispra Varese Italy

This paper presents techniques for the merging of 3d data coming from different sensors, such as ground and aerial laser range scans. The 3d models created are reconstructed to give a photo-realistic scene enabling interactive virtual walkthroughs, measurements and scene change analysis. The reconstructed model is based on a weighted integration of all available data based on sensor-specific parameters such as noise level, accuracy, inclination and reflectivity of the target, spatial distribution of points. The geometry is robustly reconstructed with a volumetric approach. Once registered and weighed, all data is re-sampled in a multi-resolution distance field using out-of-core techniques. The final mesh is extracted by contouring the iso-surface with a feature preserving dual contouring algorithm. The paper shows results of the above technique applied to Verona (Italy) city centre.

关键词： Layout Merging Laser fusion Laser modes Laser noise Noise level Reflectivity Geometry Noise robustness data mining

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