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

作者： Sui, Yunfeng Willis, Andrew R. Dept. of Elec. and Comp. Engineering University of North Carolina at Charlotte CharlotteNC28223 United States

In this paper, we present a new technique for solving the difficult problem of estimating the axis of symmetry for axiallysymmetric surfaces. Accurate solutions to this problem are important in archaeology for systems that seek to reconstruct pottery vessels from measurements of their fragments. Our approach estimates quadratic surfaces at each measured surface point and uses a Markov Random Field superimposed on measured mesh surface to combine surface estimates into surface patches, each of which lies close to a single 3d quadratic surface. For each surface patch, we estimate a quadratic implicit polynomial whose coefficients directly provide an estimate of the unknown axis location and orientation. Using the bootstrap method, distributions for the axis parameters associated with each surface patch are computed. These competing estimates of the global axis are combined using Maximum Likelihood Estimation (MLE) to provide the final estimate. Our approach differs from past approaches by combining estimates derived from large surface regions that include many measurements instead of combining many local (often pointwise) estimates of the surface to determine the global estimate. Estimates from these large regions are more robust to noise and have sufficient data to provide statistical estimates of the uncertainty in the computed estimates. Major benefits of this technique include: (i) a pre-segmentation of the surface to identify noisy, i.e., a-symmetric, regions and (ii) a Bayesian method for merging estimates that makes the axis estimate robust to outliers and highly-variable estimates. © 2008 Georgia Institute of Technology.

关键词： Maximum likelihood estimation

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The renal physiome project

The renal physiome project

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2006 3rd IEEE international symposium on Biomedical Imaging: From Nano to Macro

作者： Randall Thomas, S. Tahi, Fariza Harris, Peter Lonie, Andrew IBISC FRE 2873 CNRS University of Evry-Val d'Essonne Evry France University of Melbourne Melbourne Vic. 3010 Australia

ISBN: (纸本)0780395778

We discuss current progress towards two complementary web resources being developed for the Renal Physiome: (1) a database (QKdB) for quantitative and anatomical data at all levels of kidney organization, including molecular-level information on membrane channels and transporters, structural and functional parameter values at the epithelial level, measured flows and concentrations along vessels and nephron segments, anatomical data (including imaging studies) at all scales, etc.;and (2) an interactive interface to mathematical models of kidney structure and function, built around a zoomable 3d virtual unilobed kidney. These resources will facilitate interaction among renal modelers, experimental laboratories, and clinical researchers. © 2006 IEEE.

关键词： Biomedical engineering

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An External Calibration Method for the Circular Scanning device Used for Bend Tube Intelligent Inspection 3

An External Calibration Method for the Circular Scanning Dev...

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3rd international symposium on Robotics and Intelligent Manufacturing Technology, ISRIMT 2021

作者： Zou, Hangbo Xia, Renbo Zhao, Jibin Zhang, Tianyu Chen, Yueling Fu, Shengpeng Shenyang Institute of Automation Chinese Academy of Sciences State Key Laboratory of Robotics Shenyang110016 China Institutes for Robotics and Intelligent Manufacturing Chinese Academy of Sciences Shenyang110169 China University of Chinese Academy of Sciences Beijing100049 China

ISBN: (纸本)9781665437189

In order to realize the intelligent inspection of bend tube processing defects, such as the wrinkles and the ovality, a 3d scanning device composed of a linear translation stage and four uniformly distributed laser profilers (LPs) is built in this paper. For the external calibration of this type of device, the major contribution of this paper are: 1) A 3d calibration object composed of three non-collinear target balls (TBs) is designed. Even if the scanning angle of each LP is limited, there are still common geometric features. 2) A frame-by-frame fusion method for scan data from multiple LPs that only requires one set of rail parameters is proposed to avoid the introduction of multiple sets of rail errors that affect equipment calibration and data fusion. When calculating the parameters, the shape error of the TBs after fusing the scan data of each LP is taken as the objective function, and the nonlinear least square method is used to solve the problem. Finally, the scan data fusion can maintain the accuracy and stability of the shape. The fitting error of the TB with a nominal radius of 19.05mm does not increase with the increase of the guideway stroke, the average fitting error of the radius is stable at about 0.0014mm, and the average RMSE of the surface point is stable at about 0.0426mm. © 2021 IEEE.

关键词： data fusion

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3rd international symposium on Intelligent data Analysis, IdA 1999

3rd International Symposium on Intelligent Data Analysis, ID...

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3rd international symposium on Intelligent data Analysis, IdA 1999

ISBN: (纸本)3540663320

The proceedings contain 44 papers. The special focus in this conference is on Learning and visualization. The topics include: From theoretical learnability to statistical measures of the learnable;a methodology for designing accurate linguistic models for intelligent data analysis;mining clusters with association rules;evolutionary computation to search for strongly correlated variables in high-dimensional time-series;the biases of decision tree pruning strategies;feature selection as retrospective pruning in hierarchical clustering;discriminative power of input features in a fuzzy model;learning elements of representations for redescribing robot experiences;intelligent monitoring method using time varying binomial distribution models for pseudo-periodic communication traffic;monitoring human information processing via intelligent data analysis of EEG recordings;knowledge-based visualization to support spatial data mining;navigating through large text collections;3d grand tour for multidimensional data and clusters;a decision tree algorithm for ordinal classification;discovering dynamics using bayesian clustering;integrating declarative knowledge in hierarchical clustering tasks;nonparametric linear discriminant analysis by recursive optimization with random initialization;supervised classification problems;temporal pattern generation using hidden markov model based unsupervised classification;exploiting similarity for supporting data analysis and problem solving;multiple prototype model for fuzzy clustering;a comparison of genetic programming variants for data classification;fuzzy clustering based on modified distance measures and building classes in object-based languages by automatic clustering.

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SAR dEM filtering by mean of Bayesian and multi-scale, nonstationary methods

SAR DEM filtering by mean of Bayesian and multi-scale, nonst...

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23rd international Geoscience and Remote Sensing symposium (IGARSS 2003)

作者： Maire, C datcu, M Audenino, P German Aerosp Ctr DLR IMF Remote Sensing Technol Inst D-82230 Wessling Germany

ISBN: (纸本)0780379292

Several signal processing techniques are presented and evaluated to filter/enhance SAR digital Elevation Models (dEMs). The results are compared to a topographic digital Terrain Model (dTM) in the context of 3d visualization and real-time rendering. Through the dLR X-SRTM dEM, the interest of InSAR data for such applications is illustrated.

关键词： component SRTM dEM Bayesian inference speckle InSAR data adaptative filter fBm wavelet thresholding

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Accurate camera calibration and correction using rigidity and radial alignment constraints 4

Accurate camera calibration and correction using rigidity an...

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

作者： Liu, Yonghuai Al-Obaidi, Ala Jakas, Anthony Li, Longzhuang Aberystwyth University CeredigionSY23 3DB United Kingdom Smart Light Devices Ltd. AberdeenAB24 2YN United Kingdom Texas A and M University Corpus ChristiTX78412 United States

In this paper, we develop a novel method for camera calibration and correction. The novel method first employs a rigidity constraint from the rigid rotation matrix and the radial alignment constraint from the pin-hole camera model to estimate both camera intrinsic and extrinsic parameters with a closed-form solution without considering the camera distortion. Then the well-known Levernburg-Marquardt (LM) algorithm is employed to optimize the parameters of interest in two steps: the first step optimizes the first order radial distortion coefficient and the z component of the camera position using a partial image formation model, and the second step optimizes all the parameters of interest using a complete image formation model: 4 intrinsic, 7 extrinsic and 4 distortion parameters. The LM algorithm is initialised either as the parameters estimated so far or as zero. The optimization is achieved through minimising the sum of the squared differences between the distorted projected 3d world control points and their given corresponding distorted image points. The distorted points are finally corrected using again the LM algorithm initialized by the distorted image points themselves, minimizing the squared difference between the distorted corrected point and the given distorted image point. The experimental results based on both synthetic data and real images show that the proposed algorithm produces promising camera calibration and correction results. © 2008 Georgia Institute of Technology.

关键词： Rigidity

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Matlab software for high-resolution multichannel ECG measurement

Matlab software for high-resolution multichannel ECG measure...

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17th symposium IMEKO TC4 - Measurement of Electrical Quantities, 15th international Workshop on AdC Modelling and Testing, and 3rd symposium IMEKO TC19 - Environmental Measurements

作者： Karas, Slavomir Tysler, Milan Institute of Measurement Science Slovak Academy of Sciences Dúbravská cesta 9 841 04 Bratislava Slovakia

ISBN: (纸本)9781617823381

High resolution multichannel ECG measurement is necessary prerequisite for advanced diagnostics of various cardiovascular diseases. Special multichannel electrocardiograph ProCardio-8 was developed to obtain ECG signals with desired quality. The system is conceived as a virtual instrument with an external intelligent measuring unit connected to a host PC running dedicated application software. In this paper, the data acquisition software developed in MATLAB version 7 and using the Signal processing Toolbox is introduced. In the first part of the paper, applicability of MATLAB for fast data acquisition was verified and data throughput between the measuring unit and the PC was estimated using a data source with adjustable data rate. Second part of the paper is devoted to development and optimization of a measuring software module that includes control of the measuring unit, testing of electrode contacts and real time data acquisition, visualization and storage of measured data.

关键词： MATLAB

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Research on Auxiliary Construction System of transmission Engineering Based on 3d digital Achievements 3

Research on Auxiliary Construction System of Transmission En...

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2019 3rd international Conference on Electrical, Mechanical and Computer Engineering, ICEMCE 2019

作者： Han, Wenjun Zhang, Yongzhi Zhang, Liang Lei, ding Xinyang, Ye Zhaohu, Zhang State Grid Economic and Technology Research Institute Co. Ltd. Engineering Data Center Beijing100000 China Power China Hubei Electric Engineering Corporation Limited Digital Design Center Wuhan430040 China

In order to take full advantage of the three-dimensional digital design data and solve the traditional construction schemes' problems better, characteristics of three-dimensional digital data and the shortcomings of traditional construction management methods in the paper are analyzed. The organization management mode of 3d digital results is studied to construct a full information 3d model library by combing the relationship between models, attributes, documents, drawings, etc. On the basis of this, combined with the construction process of transmission engineering, a three-dimensional auxiliary construction application platform for transmission engineering based on three-dimensional digital design results is established. Through the software platform to manage, process, analyze and mine massive data, on the one hand, the integration, interaction and sharing of multi-source heterogeneous data are realized;on the other hand, the three-dimensional digital technology is applied to the construction process to realize the three-dimensional visualization of the construction process of the transmission engineering, thus providing a new solution for solving the construction problem. © Published under licence by IOP Publishing Ltd.

关键词： Three dimensional computer graphics

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Fast interpolated cameras by combining a GPU based plane sweep with a Max-flow regularisation algorithm

Fast interpolated cameras by combining a GPU based plane swe...

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

作者： Gevs, Indra Koninckx, Thomas P. Van Gonl, Luc ESAT PSI-VISICS Katholieke Universiteit Leuven Kasteelpark Arenberg 10 3001 Leuven Belgium D-ITET BIWI Swiss Fed. Institute of Technology Gloriastrasse 35 8092 Zürich Switzerland

ISBN: (纸本)0769522238

The paper presents a method for the high speed calculation of crude depth maps. Performance and applicability are illustrated for view interpolation based on two input video streams, but the algorithm is perfectly amenable to multi-camera environments. First a fast plane sweep algorithm generates the crude depth map. Speed results from hardware accelerated transformations and parallel processing available on the GPU. All computations on the graphical board are performed pixel-wise and a single pass of the sweep only processes one input resolution. A second step uses a min-cut/max-flow algorithm to ameliorate the previous result. The depth map, a noisy interpolated image and correlation measures are available on the GPU. They are reused and combined with spatial connectivity information and temporal continuity considerations in a graph formulation. Position dependent sampling densities allow the system to use multiple image resolutions. The min-cut separation of this graph yields the global minimum of the associated energy function. Limiting the search range according to the initialisation provided by the plane sweep further speeds up the process. The required hardware are only two cameras and a regular PC. © 2004 IEEE.

关键词： Pattern recognition

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Image-based investigation into the primary fabric of stress-transmitting particles in sand

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SOILS ANd FOUNdATIONS 2016年第5期56卷 818-834页

作者： Fonseca, J. Nadimi, S. Reyes-Aldasoro, C. C. O'Sullivan, C. Coop, M. R. City Univ London London England Imperial Coll London London England UCL London England City Univ Hong Kong Hong Kong Hong Kong Peoples R China

This paper uses three-dimensional images of a natural silica sand to analyse the mechanisms of stress transmission under triaxial compression. As discussed in Fonseca, J., O'Sullivan, C., Coop, M., Lee, P.d., (2012), the irregular morphology and locked fabric that can be found in natural sands lead to the formation of contacts with extended surface areas. However, most of our current understanding of stress-transmission phenomena comes from dEM simulations and photo-elastic experiments using idealised grain shapes and contact topologies. The direct measurement of stress transmission in assemblies of real soil grains is a challenging task. The present study postulates that important insight can be obtained by following the evolution of intergranular contacts as the grains rearrange and by considering how these rearrangements enhance the stability of the material. The methodology consists of measuring the geometrical data of the individual grains and their associated contacts obtained at successive load stages in the post-peak regime (after shear band formation). A statistical analysis of the vectors normal to the contacts reveals a realignment of these vectors in the direction of the major principal stress;this is a clear indication of the formation of force chains. A subsequent analysis shows that these columnar structures of stress-transmitting grains are associated with larger contact surfaces and have distinct patterns in the regions affected by the formation of a shear band. An algorithm based on stability and load-transmission criteria is developed to contribute new insight into the characterisation of load-bearing sand particles. (C) 2016 The Japanese Geotechnical Society. Production and hosting by Elsevier B.V.

关键词： Fabric/structure of soils 3d microscopy Shearing Locked sand Stress-transmission

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