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3rd IEEE international Conference on Mobile Services (MS)

作者： Saha, Arindam Bhowmick, Brojeshwar Sinha, Aniruddha Tata Consultancy Serv Ltd Kolkata India

ISBN: (纸本)9781479950607

Rapid or real time dense 3d reconstruction of indoor or outdoor model using mobile phone camera has become an active research topic because of the importance of 3d models in different application like remote monitoring system and visualization. In this paper we propose an application as well a system architecture which captures images using a hand held mobile Smart phone and generate an accurate and dense 3d model in a connected server using parallel computation. The method performs near real time accurate dense 3d model generation from streaming data. The application is capable of adaptive data transmission based on available network bandwidth. A comparison is presented for different amount of data transmission. The main computation is performed on a high end server system that reconstructs an accurate and complete 3d model with registration between all created models.

关键词： 3d reconstruction dense reconstruction cloud point generation camera calibration point cloud registration parallel computing

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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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2nd international symposium on 3d data processing, visualization, and transmission (3dPVI 2004)

作者： Burguet, J Gadi, N Bloch, I LTCI CNRS UMR 5141 Dept TSIEcole Natl Super Telecommun F-75013 Paris France

ISBN: (纸本)0769522238

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： Brain imaging Mathematical morphology MRI segmentation Tetrahedral mesh Topological 3d labeling

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Focal region-guided feature-based volume rendering 1

Focal region-guided feature-based volume rendering

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

作者： Zhou, JL Hinz, M Tönnies, Kd Otto Von Guericke Univ Inst Simulat & Graph D-39016 Magdeburg Germany

ISBN: (纸本)0769515223

In this paper we advocate the rise of a focal region-guided feature-based volume renderer that offers an alternative for visualization of internal structures of volumetric data. We describe this promising technique for communicating the first impression of object shape or contour while at the same time providing detailed information of volumetric data with the use of lens-like focal region. We designed a method for generating object contours and enhancing volumetric features to depict context information out of focal region based on gradient volume. In the focal region, we render interesting volume data rising the direct volume rendering method. The rendering is guided by,focal region through which we can specify what subset to render. The connection between the structure of inside and outside of focal region gives a better understanding of spatial relationship. This is to better communicate the existence, form, and location of underlying targets while minimally occluding them.

关键词： Volume rendering

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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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From 3d shape capture of animated models 1

From 3D shape capture of animated models

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1st international symposium on 3d data processing visualization and transmission, 3dPVT 2002

作者： Hilton, A. Starck, J. Collins, G. Centre for Vision Speech and Signal Processing University of Surrey GuildfordGU27XH United Kingdom

ISBN: (纸本)0769515215

This paper presents a framework for construction of animated models from captured surface shape of real objects. Algorithms are introduced to transform the captured surface shape into a layered model. The layered model comprises an articulation structure, generic control model and a displacement map to represent the high-resolution surface detail. Novel methods are presented for automatic control model generation, shape constrained fitting and displacement mapping of the captured data. Results are demonstrated for surface shape captured using both multiple view images and active surface measurement. The framework enables rapid transformation of captured data into a structured representation suitable for realistic animation. © 2002 IEEE.

关键词： Surface measurement

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data-driven approaches to digital human modeling

Data-driven approaches to digital human modeling

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2nd international symposium on 3d data processing, visualization, and transmission (3dPVI 2004)

作者： Magnenat-Thalmann, N Seo, H Univ Geneva MIRALab CH-1211 Geneva Switzerland

ISBN: (纸本)0769522238

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： range scan data human body data-driven modeling articulated deformation animation semantic annotation

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Archiving technology for plant inspection images captured by mobile active cameras - 4d visible memory 1

Archiving technology for plant inspection images captured by...

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

作者： Kita, N Kita, Y Yang, HQ Natl Inst Adv Ind Sci & Technol Intelligent Syst Res Inst AIST Tsukuba Cent 2 Tsukuba Ibaraki 3058568 Japan

ISBN: (纸本)0769515215;0769515223

The storage and later retrieval of observed data is an essential part of an), support system aiding the safe operation and maintenance of a nuclear power plant. Archiving such data, however which is broadly spread over space and time, is challenging: problems include how to reduce the amount of data, how to maintain relationships between data, how, to normalize the data and so on. We propose a new concept, 4d Visible Memory, whose basic idea is to store the data in a virtual space extended in the time dimension, as a solution. In this paper, a specific system which embodies the concept in the special case of archiving the image data gathered by mobile robots is introduced. Some experimental results show the actual usefulness of the concept.

关键词： Nuclear power plants

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Probabilistic 3d data usion for adaptive resolution surface generation 1

Probabilistic 3D data usion for adaptive resolution surface ...

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1st international symposium on 3d data processing visualization and transmission, 3dPVT 2002

作者： Johnson, A.E. Manduchi, R. Jet Propulsion Laboratory California Institute of Technology United States Computer Engineering Department University of California Santa CruzCA United States

ISBN: (纸本)0769515215

In this paper we present an algorithm for adaptive resolution integration of 3d data collected from multiple distributed sensors. The input to the algorithm is a set of 3d surface points and associated sensor models. Using a probabilistic rule, a surface probability function is generated that represents the probability that a particular volume of space contains the surface. The surface probability function is represented using an octree data structure;regions of space with samples of large covariance are stored at a coarser level than regions of space containing samples with smaller covariance. The algorithm outputs an adaptive resolution surface generated by connecting points that lie on the ridge of surface probability with triangles scaled to match the local discretization of space given by the octree. To demonstrate the performance of our algorithm, we present results from 3d data generated by scanning lidar and structure from motion. © 2002 IEEE.

关键词： Probability

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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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2nd international symposium on 3d data processing, visualization, and transmission (3dPVI 2004)

作者： Mueller, K Smolic, A Merkle, P Kaspar, B Eisert, P Wiegand, T Heinrich Hertz Inst Nachrichtentech Berlin GmbH Fraunhofer Inst Telecommun Image Proc Dept D-10587 Berlin Germany

ISBN: (纸本)0769522238

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： Image reconstruction

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processing of transmission data from an uncollimated single photon source

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NUCLEAR INSTRUMENTS & METHOdS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS dETECTORS ANd ASSOCIATEd EQUIPMENT 2006年第2期569卷 416-420页

作者： dikaios, N. dinelle, K. Spinks, T. Nikita, K. Thielemans, K. Hammersmith Imanet Ltd London England Natl Tech Univ Athens Sch Elect & Comp Engn GR-10682 Athens Greece

The EXACT 3d PET scanner uses a Cs-137 single photon rotating point source for the transmission scan. As the source is uncollimated, the transmission data are contaminated by scatter. It has been suggested that segmentation of the reconstructed image can restore the quantitative information in the image. We study here if the results can be further improved by the application of a scale factor for every transaxial plane. (c) 2006 Elsevier B.V. All rights reserved.

关键词： transmission processing segmentation PET

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