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3d animation of cerebral activity using both spatial and temporal fMRI information

3D animation of cerebral activity using both spatial and tem...

引用

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

作者： C. Aguerre P. desbarats B. dilharreguy C.T.W. Moonen IMF CNRS Université Bordeaux Bordeaux France

Functional MRI (fMRI) has become a major tool in understanding brain function. Functional maps are superimposed on higher definition anatomical images. However these maps are only visualized in 2d or 3d. The temporal information, provided by the fMRI acquisition, is usually ignored. The main purpose is to present a software designed to provide animation of activation maps. This approach helps researchers to follow temporal dynamics of the neuronal network involved in brain activation at different time scales, allowing them to identify the priority of the activation of cerebral structures.

关键词： Animation Protons Magnetic fields Frequency Magnetic resonance imaging Nuclear magnetic resonance Fourier transforms data visualization dipole antennas Gyromagnetism

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Active balloon model based on 3d skeleton extraction by competitive learning

Active balloon model based on 3D skeleton extraction by comp...

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

作者： K. Morooka H. Takagi H. Nagahashi Imaging Science and Engineering Laboratory Tokyo Institute of Technology Yokohama Japan Interdisciplinary Graduate School of Science and Engineering Tokyo Institute of Technology Yokohama Japan

We focus on the polygonal representation of a 3d object model which is composed of a lot of points on the object surface. In the 3d animation, it is sometimes necessary to use multiresolution representation of a model to cope with various situations, and it is preferable to represent the models with different resolutions in a certain unified data structure. In order to meet these requirements, we present a new method which generates the approximated model of an original one by using multiple deformable models, called active balloon models (ABMs). We extract the three-dimensional skeleton of the object. The obtained skeleton comprises nodes and edges, and represents the structure of the object. Based on the skeleton, the approximated model is generated by deforming the ABMs. Some experimental works are made to verify the capability of our method.

关键词： Skeleton deformable models Shape Animation data structures Topology Laboratories data mining Polynomials Character generation

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Registration and fusion of intensity and range data for 3d modelling of real world scenes

Registration and fusion of intensity and range data for 3D m...

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

作者： P. dias V. Sequeira F. Vaz J.G.M. Goncalves University of Aveiro IEETA Portugal EC Joint Research Center Italy

A novel technique combining intensity and range data is presented. Passive (intensity based) and active (range based) techniques used for 3d reconstruction have their limitations and separately, none of these techniques can solve all the problems inherent to the modelling of real environments. Our technique aims to demonstrate how both intensity and range data can be registered and combined into a long-range 3d system. The procedure needs an initial estimation for internal and external camera parameters for two or more intensity images. The technique uses passive triangulation of the intensity data to refine the initial camera calibrations and ensure a good registration of range and video data sets. Once a reliable calibration is achieved, corresponding points from the intensity images are triangulated and introduced in the original range data. With our technique, it is possible to complete the models in areas where data is missing or to increase the resolution in areas of high interest and 3d contents.

关键词： Layout Spatial resolution Image reconstruction Cameras Calibration Image resolution Costs Video sequences Machine vision Lighting

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An optimal scheduling algorithm for stream based parallel video processing

引用

18th international symposium on Computer and Information Sciences, ISCIS 2003

作者： Altılar, d. Turgay Paker, Yakup Department of Computer Engineering İstanbul Technical University Ayazaga Campus Maslak İstanbul34457 Turkey Department of Computer Science Queen Mary University of London Mile End Road LondonE1 4NS United Kingdom

ISBN: (纸本)3540204091

We present a new optimal scheduling algorithm called Periodic Write-Read-Compute (PWRC) scheduling for stream based parallel video processing. Although PWRC scheduling exploits the properties of the video data, it is applicable to any type of periodic data over which a data independent application is to run. The PWRC algorithm is designed considering a bus based parallel architecture allowing point-topoint communication between host and workers. The PWRC requires a high level atomic write-read command for data transmission which can be created in various ways. The analysis of the PWRC provides information either to form a parallel video processing system or to predict the overall performance of an existing system in order to meet real-time requirements of video processing. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Parallel architectures

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Solving architectural modelling problems using knowledge

Solving architectural modelling problems using knowledge

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

作者： R.B. Fisher School of Informatics University of Edinburgh UK

We summarize a series of recent research results made at Edinburgh University based on applying domain knowledge of standard shapes and relationships to solve or improve architectural reconstruction problems. The problems considered are how to enforce known relationships when data fitting, how to extract features even in very noisy data, how to get better shape parameter estimates and how to infer data about unseen features.

关键词： Shape Surface fitting Buildings Surface reconstruction Noise shaping Humans Concurrent computing Image reconstruction Informatics data mining

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A discrete Reeb graph approach for the segmentation of human body scans

A discrete Reeb graph approach for the segmentation of human...

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

作者： Y. Xiao P. Siebert N. Werghi Department of Computing Sciences University of Glasgow UK College of Information Technology Dubai University College UAE

Segmentation of 3d human body (HB) scan is a very challenging problem in applications exploiting human scan data. To tackle this problem, we propose a topological approach based on discrete Reeb graph (dRG) which is an extension of the classical Reeb graph to unorganized cloud of 3d points. The essence of the approach is detecting critical nodes in the dRG thus permitting the extraction of branches that represent the body parts. Because the human body shape representation is built upon global topological features that are preserved so long as the whole structure of the human body does not change, our approach is quite robust against noise, holes, irregular sampling, moderate reference change and posture variation. Experimental results performed on real scan data demonstrate the validity of our method.

关键词： Humans Image segmentation data mining Shape Noise shaping Arm Leg Torso Educational institutions Noise robustness

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3d head pose estimation with optical flow and depth constraints

3D head pose estimation with optical flow and depth constrai...

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

作者： Y. Zhu K. Fujimura Department of Computer and Information Science Ohio State Uinversity Columbus OH USA Honda Research Institute USA Inc. Mountain View CA USA

A method is presented to estimate 3d head poses effectively by hybrid sensing of depth and gray information. depth information is used to generate clean head segmentation even in a cluttered scene. Based on the segmentation result, sparse optical flow at head region is extracted and used for 3d head motion estimation in video rate. This method is shown to be effective through experiments on video sequences. Our method provides an alternative way for 3d head pose estimation from an image sequence in the current computer vision literature. Moreover, the depth information is incorporated into the estimation step as regularization for noisy motion estimation problem.

关键词： Image motion analysis Head Motion estimation Optical sensors Layout Image segmentation data mining Video sequences Image sequences Computer vision

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Recursive model optimization using ICP and free moving 3d data acquisition

Recursive model optimization using ICP and free moving 3D da...

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

作者： F. Blais M. Picard G. Godin Institute for Information Technology National Research Council Canada Ottawa ONT Canada

We describe a recursive multiresolution algorithm that reconstructs high-resolution and high-accuracy 3d images from low-resolution sparse range images or profiles. The method starts by creating a rough, partial, and potentially distorted estimate of the model of the object from an initial subset of sparse range data; then, using ICP algorithms, it recursively improves and refines the model by adding new range information. In parallel, real-time tracking of the object is performed in order to allow the laser scan to be automatically centered on the object. The end result is the creation of a high-resolution and accurate 3d model of a free-floating object, and real-time tracking of its position. Examples of the method are presented when the object and the 3d camera are moving freely with respect to each other. The system provides high accuracy hand-held laser scanning that does not require complex and costly mechanical scanning apparatus or external positioning devices.

关键词： data acquisition Iterative closest point algorithm Image reconstruction Iterative algorithms Laser modes Minimization methods Councils Information technology Recursive estimation Laser noise

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Surface curvature estimation from the signed distance field

Surface curvature estimation from the signed distance field

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

作者： T. Masuda National Institute of Advanced Industrial Science and Technology (AIST) Intelligent Systems Institute AIST Tsukuba Ibaraki Japan

We propose a method of computing surface curvature properties from the signed distance field (SdF) samples in the 3d space. The SdF representation contains information of the surface normal at the closest point on the surface from the sampling point. The variance of these information from different sampling points within the neighborhood reflects the curvature information. Because this sampling is done in the 3d space, we do not directly referees to the parametric surface coordinates or polygon structures. The computation is stable because it requires only linear algebraic operations. It is possible to extract multiple scale curvatures by changing sampling interval. The proposed method was applied on real data, and result of multiscale curvature extraction is presented.

关键词： Sampling methods Shape measurement Nonlinear filters Surface fitting Space technology data mining Computer vision Object recognition Coordinate measuring machines Intelligent systems

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Accuracy verification and enhancement in 3d modeling: application to donatello's Maddalena

Accuracy verification and enhancement in 3D modeling: applic...

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

作者： G. Guidi A. Cioci C. Atzeni J.-A. Beraldin DET Università degli Studi di Firenze Florence Italy National Research Council Canada Istituto Italiano di Tecnologia Ottawa ONT Canada

The three-dimensional acquisition and modeling of donatello's Maddalena was started in order to create a methodology that aims at monitoring fragile wooden sculptures over the years. Hence a set of new approaches in 3d modeling was needed for obtaining the necessary metric reliability. The main focus of the work is modeling accuracy, therefore quality control procedures based both of the self check of 3d data and the use of complementary 3d sensors were developed for testing the model. Sensor fusion was also extensively used in order to correct a few alignment errors after the ICP phase leading to a not negligible overall metric discrepancy. All the steps of the acquisition procedure, from the project planning to the solution of the various technical and logistical problems are reported. Although few commercial systems claim to use a similar approach, for the first time, the noninvasive integration of photogrammetry and 3d scanning, specifically designed for applications in cultural heritage, is extensively documented here.

关键词： Cameras Cultural differences Gold Surface cracks Councils Monitoring Quality control Automatic testing Sensor fusion Error correction

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