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

共 655 条记录，以下是381-390 订阅

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Using 3d-Bresenham for resampling structured grids

Using 3D-Bresenham for resampling structured grids

引用

international symposium on 3d data processing visualization and transmission

作者： L.I. dimitrov M. Sramek Commission for Scientific Visualization Austrian Academy of Sciences Vienna Austria

Structured grids and some of their applications in natural sciences are discussed. The problem of their visualization and quantitative evaluation is considered and possible ways for its solution sketched. Resampling a structured grid onto a regular one is such a possible solution offering the additional benefit of enabling quantitative evaluations, too. This resampling is achieved by a preliminary tetrahedronization of the structured grid(s) and a subsequent digitalization of the constituent tetrahedrons using an adaptation of the 3d-Bresenham algorithm. Advantages and disadvantages of this approach as compared to other possible schemes are discussed. An implementation based on our open source f3d-file format for storage and transmission of volumetric data is presented, and results from applying it to real-world data shown.

关键词： data visualization Geologic measurements Sampling methods Stress Area measurement Geology Interpolation Scattering Production Earth

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Reconstruction of Euclidean planes from voxels

Reconstruction of Euclidean planes from voxels

引用

international symposium on 3d data processing visualization and transmission

作者： T.K. Linh School of Science and Technology Chiba University Chiba Japan

We aim to formulate the recognition of a planes from a discrete point set as a nonlinear optimization problem, and we prove a uniqueness theorem for the solution of this problem. We deal with the supercover model in a space for the expression of discrete planes. The algorithm achieves invertible data compression of digital objects, since the algorithm transforms a collection voxels to a collection of plane parameters, which classify the voxels.

关键词： data compression Geometry discrete transforms Character recognition Linear programming Noise robustness Object detection data processing data visualization Hypercubes

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A unified representation for interactive 3d modeling

A unified representation for interactive 3D modeling

引用

international symposium on 3d data processing visualization and transmission

作者： d. Tubic P. Hebert J.-d. deschenes d. Laurendeau Computer Vision and Systems Laboratory University of Laval QUE Canada

Interactive 3d modeling is the process of building a 3d model of an object or a scene in real-time while the 3d (range) data is acquired. This is possible only if the computational complexity of all involved algorithms is linear with respect to the amount of data. We propose a new framework for 3d modeling where a complete modeling chain meets with this requirement. The framework is based on the use of vector fields as an implicit surface representation. Each modeling step, registration, surface reconstruction, geometric fusion, compression and visualization is solved and explained using the vector fields without any intermediate representations. The proposed framework allows model reconstruction from any type of 3d data, surface patches, curves, unorganized sets of points or a combination of these.

关键词： Surface reconstruction Computational complexity Real time systems Solid modeling data visualization Vectors Computer vision Laboratories Layout Computational modeling

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Shape matching using the 3d Radon transform

Shape matching using the 3D Radon transform

引用

international symposium on 3d data processing visualization and transmission

作者： P. daras d. Zarpalas d. Tzovaras M.G. Strintzis Information Processing Laboratory Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki Greece Informatics and Telematics Institute Thessaloniki Greece

A method for 3d model content-based search and retrieval based on the 3d Radon transform and a querying-by-3d-model approach, is presented. descriptors are extracted using the 3d Radon transform and applying a set of functionals on the transform coefficients. Similarity measures are then created for the extracted descriptors and introduced into a 3d model-matching algorithm. This results to a very fast and accurate matching method. Experiments were performed using two different databases and comparing the proposed method with others. Experimental results show that the proposed method can be used for 3d model search and retrieval in a highly efficient manner.

关键词： Shape measurement Solid modeling data mining Histograms Volume measurement Information processing Laboratories Informatics Telematics Information retrieval

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3d non-linear invisible boundary detection filters

3D non-linear invisible boundary detection filters

引用

international symposium on 3d data processing visualization and transmission

作者： M. Petrou F. Mohanna V. Kovalev Centre for Vision Speech and Signal Processing School of Electronics and Physical Sciences University of Surrey Guildford UK

The human vision system can discriminate regions which differ up to the second order statistics only. A lot of malignant tumours have boundaries which are not visible to the human eye. We present an algorithm designed to reveal "hidden" boundaries in grey level images, by computing gradients in higher order statistics of the data. We demonstrate it by applying it to the identification of possible "hidden" boundaries of gliomas as manifest themselves in MRI 3d scans.

关键词： Image edge detection Tumors detectors Humans Higher order statistics Statistical distributions Filters Signal processing algorithms Machine vision Cancer

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Real time visualization of 3d variable in time object based on cloud of points data gathered by coloured structure light projection system

Real time visualization of 3D variable in time object based ...

引用

international symposium on 3d data processing visualization and transmission

作者： P. Garbat M. Wegiel M. Kujawinska Institute of Micromechanics and Photonics Warsaw University of Technology Warsaw Poland

The problem of virtual view creation has received increasing attention in recent years. Major current approaches are based on modified stereo vision systems. Recently the structure light measurement system based on digital light projection supported by special data coding and processing allow to rapid 3d shape acquisition. Application of this technology to record 3d data has increased significantly the accuracy of reconstructed shape and simplified data manipulation process. In the paper the general concept of virtual reality system supported by data gathered by means of structure light projection is presented. The methodology of conversion of cloud of measurement points (x,y,z,R,G,B) into virtual reality environment is described. It is supported by implementation of a virtual camera concept, as the mean for interactive object visualization. The methodology of real time 3d object visualization based on its coding by means of specially formed contours and their B-spline approximation is presented. The applicability of the methodology has been shown on numerically generated data which simulate performance of the measurement system. The total processing path was successfully tested.

关键词： Real time systems data visualization Clouds data processing

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3-dimensional object modeling with mesh simplification based resolution adjustment

3-Dimensional object modeling with mesh simplification based...

引用

international symposium on 3d data processing visualization and transmission

作者： O. Ulucay S. Erturk Electronics & Communication Engineering Department University of Kocaeli Izmit Kocaeli Turkey

A 3-dimensional (3d) object modeling technique with mesh simplification and refinement based resolution adjustment is proposed in this paper. Polygonal models which are widely utilized in the modeling of 3d objects are taken as basis, making use of the polygonal structure and vertex coordinates for the display of 3d models. The amount of polygons and vertices of a model is proportional to the resolution as well as data quantity. In other words the resolution and data increases with the number of polygons. In this paper, it is proposed to utilize resolution, and hence data amount, adjustable 3d modeling so that model resolution and transmitted data amount can be regulated according to access constraints.

关键词： Shape Three dimensional displays Application software Merging Computer graphics Games Object recognition Video coding Information geometry Sampling methods

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3d modelling and visualization of the human lung

3D modelling and visualization of the human lung

引用

international symposium on 3d data processing visualization and transmission

作者： T. Zrimec S. Busayarat Centre for Health Informatics University of New South Wales Sydney Australia School of Computer Science and Engineering University of New South Wales Sydney Australia

A method for modelling and visualizing human lungs using knowledge of lung anatomy and high resolution CT (HRCT) images is presented. The model consists of a symbolic description of lung anatomy and a 3d atlas. The 3d atlas is constructed using HRCT volume data. A few anatomical landmarks are determined and are used to divide the lungs into anatomically and diagnostically important regions. The landmarks and the lung regions enable accurate mapping of the model to patient data and enable the system to deal with image and human variability. The model can be displayed as a set of labelled axial slices and as a 3d model of the lungs. The 3d visualization enables rotation and viewing of lung structures, lung features and lung regions from different angles.

关键词： Humans Lungs Anatomy data visualization Computed tomography Biomedical imaging Medical diagnostic imaging Biological system modeling Pathology Image resolution

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Online surface reconstruction from unorganized 3d-points for the dLR hand-guided scanner system

Online surface reconstruction from unorganized 3D-points for...

引用

international symposium on 3d data processing visualization and transmission

作者： T. Bodenmueller G. Hirzinger German AeroSpace Center (DLR) Institute of Robotics and Mechatronics Wessling Germany

Hand-guided scanners allow for digitization by manually sweeping a laser beam over an object's surface. The result highly depends on the way the user handles the system and his ability to keep track of the parts of the surface that are already scanned. processing and visualization during data acquisition are helpful in this context. In this paper, we propose an online surface reconstruction algorithm for the visualization of the dLR scanner system data. The algorithm successively generates a triangle mesh by incrementally inserting 3d points. Point neighborhoods are used to limit the point density, to estimate the surface normal at the inserted point, and to locally retriangulate the mesh. A dynamic data structure for fast neighborhood search without restrictions to the amount of vertices or the object size and with low complexity is introduced. Finally, results with the hand-guided scanner system are presented.

关键词： Surface reconstruction data visualization Mesh generation Painting displays Fusion power generation Robots Mechatronics Laser beams Surface emitting lasers

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Construction of animal models and motion synthesis in 3d virtual environments using image sequences

Construction of animal models and motion synthesis in 3D vir...

引用

international symposium on 3d data processing visualization and transmission

作者： C. Panagiotakis G. Tziritas Department of Computer Science University of Crete Heraklion Greece

We describe a system that can build 3d animal models and synthesize animations in 3d virtual environments. The model is constructed by 2d images captured by specific views. The animation is synthesised by using physical motion models of the animal and tracking data from image sequences. Finally, the user selects some points of the 3d world and a smooth and safe motion path, which passes by these points, is created. The main assumption of the 3d modelling is that the animal could be divided into parts whose normal sections are ellipses. Joints and angles between skeleton points are used in order to decrease models complexity. Using the above methodology, a snake, a lizard and a goat are reconstructed.

关键词： Animals Image sequences Animation Image motion analysis Image sequence analysis Motion analysis Muscles Signal processing algorithms Virtual environment Image analysis

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