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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311-320 订阅

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3d non-linear invisible boundary detection filters

3D non-linear invisible boundary detection filters

引用

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

作者： Petrou, M Mohanna, F Kovalev, V Univ Surrey Sch Elect & Phys Sci Ctr Vis Speech & Signal Proc Guildford GU2 7XH Surrey England

ISBN: (纸本)0769522238

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： Vision

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Seeing into the past: Creating a 3d modeling pipeline for archaeological visualization

Seeing into the past: Creating a 3D modeling pipeline for ar...

引用

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

作者： Allen, P Feiner, S Troccoli, A Benko, H Ishak, E Smith, B Columbia Univ Dept Comp Sci New York NY 10027 USA

ISBN: (纸本)0769522238

Archaeology is a destructive process in which accurate and detailed recording of a site is imperative. As a site is exposed, documentation is required in order to recreate and understand the site,in context. We have developed a 3d modeling pipeline that can assist archaeologists in the documentation effort by building rich, geometrically and photometrically accurate 3d models of the site. The modeling effort begins with data acquisition (images, range scans, GIS data, and video) and ends with the use of a sophisticated visualization tool that can be used by researchers to explore and understand the site. The pipeline includes new methods for shadow-based registration of 2d images and temporal change detection. Our multimodal augmented reality system allows users wearing head-tracked, see-through, head-worn displays to visualize the site model and associated archaeological artifacts, and to interact with them using speech and gesture.

关键词： Computer science

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Acquisition, modelling and rendering of very large urban environments

Acquisition, modelling and rendering of very large urban env...

引用

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

作者： Boström, G Fiocco, M Puig, d Rossini, A Gonçalves, JGM Sequeira, V Commiss European Communities Joint Res Ctr I-21020 Ispra Italy

ISBN: (纸本)0769522238

In this paper we describe a vehicle borne data acquisition system for urban environments and associated 3d data management and interactive rendering software. The data acquisition system is capable of acquire 3d data from urban areas with centimetre resolution including automatic capturing of colour. The system includes a management and interactive rendering software which is designed to cope with the huge quantities of data generated by the acquisition system. It uses out-of-core pre-processing to transform data into octrees. Real-time interactive rendering is achieved by using novel techniques such as front-to-back octree traversal, occlusion query and speculative pre-fetching. The paper presents the results of the described techniques applied to large public areas including the City Centre of Verona, Italy.

关键词： data acquisition

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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...

引用

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

作者： Yan, XT Meng, F Zha, HB Peking Univ Natl Lab Machine Percept Beijing 100871 Peoples R China

ISBN: (纸本)0769522238

We propose a new 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： Image reconstruction

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3-dimensional object modeling with mesh simplification based resolution adjustment

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

引用

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

作者： Ulucay, Ö Ertürk, S Kocaeli Univ Elect & Commun Engn Dept TR-410470 Izmit Kocaeli Turkey

ISBN: (纸本)0769522238

A 3-dimensional (3-d) 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 3-d objects are taken as basis, making use of the polygonal structure and vertex coordinates for the display of 3-d 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 3-d modeling so that model resolution and transmitted data amount can be regulated according to access constraints.

关键词： Object recognition

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3d performance capture for facial animation

3D performance capture for facial animation

引用

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

作者： MacVicar, d Ford, S Borland, E Rixon, R Patterson, J Cockshott, P Univ Glasgow Dept Comp Sci Glasgow G12 8QQ Lanark Scotland

ISBN: (纸本)0769522238

This paper 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 are 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： Animation

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View dependence of 3d recovery from folded pictures and warped 3d faces

View dependence of 3D recovery from folded pictures and warp...

引用

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

作者： Cavanagh, P von Grünau, M Zimmerman, L Harvard Univ Dept Psychol Cambridge MA 02138 USA

ISBN: (纸本)0769522238

In a popular visual illusion, the portrait on paper currency is folded into an M shape along vertical lines through the nose and the eyes. When this folded picture is tilted back and forth horizontally the face undergoes striking changes in expression. This distortion reveals two insights concerning 3d representation in the human visual system and we have explored these with experiments on simple schematic faces and observations on distortions of laser range images of faces. The observations show first that when recovering depicted depth, pictorial cues are interpreted independently of binocular depth information mid second, that the recovery of facial expression is based on a scaled prototypical face structure.

关键词： Face recognition

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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 ...

引用

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

作者： Cook, J Chandran, V Sridharan, S Fookes, C Queensland Univ Technol Image & Video Res Lab Brisbane Qld 4000 Australia

ISBN: (纸本)0769522238

A new 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 non-rigid 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 the 3d_rma database.

关键词： Face recognition

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Metrological analysis of a procedure for the automatic 3d modeling of dental plaster casts

Metrological analysis of a procedure for the automatic 3D mo...

引用

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

作者： Brusco, N Andreetto, M Carmignato, S Cortelazzo, GM Univ Padua Dept Informat Engineer I-35100 Padua Italy

ISBN: (纸本)0769522238

As well known, in the reconstruction of the 3d models through optical systems, the errors are due to the single-view acquisition error and to the 3d modeling procedure. The latter can be ascribed to the various phases of the 3d modeling pipeline: pairwise registration, global registration, surface integration. This work examines the acquisition error as well as the errors due to an automatic procedure recently proposed for the 3d modeling of dental plaster casts. This contribution derives a simple error propagation model, rather useful for practical simulation purposes. From a general viewpoint, this contribution proposes a useful simulation of error propagation in 3d modeling, it shows the quality of an automatic 3d modeling procedure recently proposed and it shows the accuracy of 3d modeling dental plaster casts by current commercial range cameras an the considered automatic method.

关键词： Medical imaging

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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...

引用

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

作者： Park, J Kak, AC Purdue Univ Robot Vis Lab W Lafayette IN 47907 USA

ISBN: (纸本)0769522238

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 multi-peak 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： Object recognition

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