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共 655 条记录，以下是401-410 订阅

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Unifying measured point sequences of deforming objects

Unifying measured point sequences of deforming objects

引用

international symposium on 3d data processing visualization and transmission

作者： M. Shinya Department of Information Science Toho University Japan

Recent progress in digitizing technologies is making it possible to capture the 3d shapes of moving objects. To efficiently utilize time series records of spatial data, the information must be unified to yield coherent deforming models. We present a general method that unifies unregistered 3d point sequences to generate deforming mesh models. The method does not assume any specific kinematic structure, and is applicable to any digitizer. The method first polygonizes the initial points and then deforms meshes to best fit the subsequent data points while minimizing the deformation energy. Experiments are conducted on real measured data and CG data, and successful results are obtained. As an application of the method, we examine data compression and achieve a 380 fold reduction rate for a measured data sequence.

关键词： Kinematics Shape deformable models Cameras Mesh generation data compression Computer vision Layout data mining Solid modeling

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3d model watermarking for indexing using the generalized Radon transform

3D model watermarking for indexing using the generalized Rad...

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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

The present paper proposes a novel method for 3d-model watermarking for indexing. The proposed approach is based on the use of a generalized Radon transformation. More specifically, the cylindrical integration transform (CIT) is initially applied to the 3d models in order to produce descriptor vectors. At the same time a watermarking technique, based on CIT is used in order to embed a specific model identifier in the nodes of the 3d model. This identifier links the model to its descriptor vector, which is extracted only once and stored in a database. Every time this model is employed as a query model, watermark detection is used so as to retrieve the corresponding identifier and further the descriptor vector, which can be further used in a matching algorithm. The proposed techniques are evaluated experimentally in terms of both watermarking efficiency and content-based retrieval performance.

关键词： Watermarking Indexing Content based retrieval Robustness deformable models Multimedia databases Application software Humans Shape Information processing

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Adaptive online transmission of 3d TexMesh using scale-space analysis

Adaptive online transmission of 3D TexMesh using scale-space...

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international symposium on 3d data processing visualization and transmission

作者： I. Cheng P. Boulanger Department of Computing Science University of Alberta Edmonton Canada

Efficient online visualization of 3d mesh and photo realistic texture is essential for a variety of applications, such as museum exhibits and medical images. In these applications synthetic texture and a predefined set of views is not an option. We propose using a mesh simplification algorithm based on scale-space analysis of the feature point distribution, combined with an associated analysis of the surface texture, to address the needs of adaptive online transmission of high quality 3d objects. The premise of the proposed textured mesh (TexMesh) simplification is the following: minor variations in texture can be ignored in relatively smooth regions of a 3d surface, without significantly affecting human perception. Statistics on 3d feature point distribution and their associated texture fragments are gathered during preprocessing. Online transmission is based on these statistics, which can be retrieved in constant time. Based on monitored bandwidth a scaled mesh is first transmitted. Starting from a default texture quality, we apply an efficient harmonic time compensation algorithm based on the current bandwidth and a time limit, to adaptively adjust the texture quality of the next fragment. Properties of the algorithm are proved. Experimental results show the usefulness of our approach.

关键词： Bandwidth Algorithm design and analysis Monitoring Image texture analysis Surface texture Humans Statistical distributions Animation Image coding Rendering (computer graphics)

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Automated texture mapping of 3d city models with oblique aerial imagery

Automated texture mapping of 3D city models with oblique aer...

引用

international symposium on 3d data processing visualization and transmission

作者： C. Frueh R. Sammon A. Zakhor Department of Computer Science and Electrical Engineering University of California Berkeley USA

This work describes an approach to texture mapping a 3d city model obtained from aerial and ground-based laser scans with oblique aerial imagery. First, the images are automatically registered by matching 2d image lines with projections of 3d lines from the city model. Then, for each triangle in the model, the optimal image is selected by taking into account occlusion, image resolution, surface normal orientation, and coherence with neighboring triangles. Finally, the utilized texture patches from all images are combined into one texture atlas for compact representation and efficient rendering. We evaluate our approach on a data set of downtown Berkeley.

关键词： Cities and towns Rendering (computer graphics) Image resolution Geometrical optics Stereo vision Laser modes Coherence Image registration Synthetic aperture radar Application software

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Blind watermarking of 3d shapes using localized constraints

Blind watermarking of 3D shapes using localized constraints

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international symposium on 3d data processing visualization and transmission

作者： A.G. Bors Department of Computer Science University of York York UK

This paper develops a digital watermarking methodology for 3d graphical objects defined by polygonal meshes. In watermarking or fingerprinting the aim is to embed a code in a given media without producing identifiable changes to it. One should be able to retrieve the embedded information even after the shape had suffered various modifications. Two blind watermarking techniques applying perturbations onto the local geometry for selected vertices are described in this paper. The proposed methods produce localized changes of vertex locations that do not alter the mesh topology. A study of the effects caused by vertex location modification is provided for a general class of surfaces. The robustness of the proposed algorithms is tested at noise perturbation and object cropping.

关键词： Watermarking Shape Object detection Fingerprint recognition Information retrieval Topology Algorithm design and analysis Computer science Geometry Noise robustness

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Using omnidirectional structure from motion for registration of range images of minimal overlap

Using omnidirectional structure from motion for registration...

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international symposium on 3d data processing visualization and transmission

作者： d. Gupta A. Kumar K. daniilidis GRASP Laboratory University of Pennsylvania Philadelphia PA USA

We propose a novel method of merging a series of range images with a minimal overlap between any two consecutive range images. We rigidly mount a parabolic catadioptric camera to the range scanner. Using two omniviews we are able to accurately estimate the relative displacement between two range views. The resultant motion is used for the registration of all range data to the same coordinate system. An additional perspective camera calibrated with respect to the scanner is used for texture mapping.

关键词： Cameras Merging Laser modes Geometry Iterative algorithms Image storage Laboratories delta modulation Optical modulation Laser beams

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Fan-Meshes: a geometric primitive for point-based description of 3d models and scenes

Fan-Meshes: a geometric primitive for point-based descriptio...

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international symposium on 3d data processing visualization and transmission

作者： Xiaotian Yan Fang Meng Hongbin Zha National Laboratory on Machine Perception Peking University Beijing China

ISBN: (纸本)0769522238

We propose a data structure, called Fan-Meshes (FM), for reconstructing 3d models and scenes represented by dense scanning point clouds. It is a local piecewise linear approximation to the data geometry, and can serve as primitives in reconstruction with a good balance between computational loads and reconstruction quality. In our algorithm, local remeshing is performed in preprocessing to obtain regular FMs, and a three-level-point data structure called triangle selection record (TSR) is then used to reduce redundancies in the raw data and overlapping in the original FMs. Furthermore, to apply the method to raw 3d scanning data, we use a smoothing operator to the point cloud in order to eliminate some sensor noises. Experimental results demonstrate that our scheme is effective even for large-scale scenes with real data.

关键词： Solid modeling Layout Clouds Piecewise linear approximation Flexible manufacturing systems data structures Smoothing methods Surface reconstruction Redundancy Computational efficiency

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Specularity elimination in range sensing for accurate 3d modeling of specular objects

Specularity elimination in range sensing for accurate 3D mod...

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international symposium on 3d data processing visualization and transmission

作者： J. Park A.C. Kak Robot Vision Laboratory Purdue University West Lafayette IN USA

We present a novel range sensing method that is capable of constructing accurate 3d models of specular objects. Our method utilizes a new range imaging concept called multipeak range imaging, which accounts for the effects of mutual reflections. False measurements generated by mutual reflections are then eliminated by applying a series of constraint tests based on local smoothness, global coordinate consistency and visibility consistency. We show the usefulness of our method by applying the method to three real objects with specular surfaces. The ground truth data for those three objects were also acquired in order to evaluate the elimination of false measurements and to justify the selection of the parameters in the constraint tests. Experimental results indicate that our method significantly improves upon the traditional methods for constructing reliable 3d models of specular objects with complex shapes.

关键词： Optical reflection Cameras Shape Surface emitting lasers Testing visualization Iterative algorithms Robot sensing systems Robot kinematics Robot vision systems

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3d performance capture for facial animation

3D performance capture for facial animation

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international symposium on 3d data processing visualization and transmission

作者： d.M. Vicar S. Ford E. Borland R. Rixon J. Patterson P. Cockshott Dept. Computing Science The University of Glasgow U.K.

This work describes how a photogrammetry based 3d capture system can be used as an input device for animation. The 3d dynamic Capture System is used to capture the motion of a human face, which is extracted from a sequence of 3d models captured at TV frame rate. Initially the positions of a set of landmarks on the face are extracted. These landmarks are then used to provide motion data in two different ways. First, a high level description of the movements is extracted, and these can be used as input to a procedural animation package (i.e. CreaToon). Second the landmarks can be used as registration points for a conformation process where the model to be animated is modified to match the captured model. This approach gives a new sequence of models, which have the structure of the drawn model but the movement of the captured sequence.

关键词： Facial animation Cameras data mining Financial advantage program Humans Head Motion analysis MPEG 4 Standard Frequency Face

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Face recognition from 3d data using Iterative Closest Point algorithm and Gaussian mixture models

Face recognition from 3D data using Iterative Closest Point ...

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international symposium on 3d data processing visualization and transmission

作者： J. Cook V. Chandran S. Sridharan C. Fookes Image and Video Research Laboratory Queensland University of Technology Brisbane QLD Australia

An approach to face verification from 3d data is presented. The method uses 3d registration techniques designed to work with resolution levels typical of the irregular point cloud representations provided by structured light scanning. Preprocessing using a-priori information of the human face and the Iterative Closest Point algorithm are employed to establish correspondence between test and target and to compensate for the nonrigid nature of the surfaces. Statistical modelling in the form of Gaussian mixture models is used to parameterise the distribution of errors in facial surfaces after registration and is employed to differentiate between intra- and extra-personal comparison of range images. An equal error rate of 2.67% was achieved on the 30 subject manual subset of the 3d/spl ***/rma database.

关键词： Face recognition Iterative closest point algorithm Humans Testing Laser modes Laser sintering Shape Support vector machines Support vector machine classification Iterative algorithms

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