In this paper, we propose a viewer for huge point-sampled models by combining out-of-core technologies with view-dependent level-of-detail (LOd) control. This viewer is designed on the basis of a multiresolution data ...
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ISBN:
(纸本)0769522238
In this paper, we propose a viewer for huge point-sampled models by combining out-of-core technologies with view-dependent level-of-detail (LOd) control. This viewer is designed on the basis of a multiresolution data structure we have developed for gaze-guidedvisualization andtransmission of 3d point sets. In order to reduce memory loads for huge point sets on general PC platforms, we introduce a partition-based out-of-core strategy to balance usage of main and external memories. At first, the data surface is partitioned into small blocks and points in each block are reorganized into error-controlled LOds by hierarchical clustering and LOd organization. In the interactive rendering process, a data block scheduling algorithm is used to realize the view-dependent paging. Experimental results show that the viewer can perform interactive visualization of huge point models on commodity graphics platforms with ease.
In order to automatically extract an arbitrary 3d region from 3d image data (volume data), we have developed a physics-based approach using a 3ddeformable grid model, which we called "3d Active Grid". 3d Ac...
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ISBN:
(纸本)0769515215;0769515223
In order to automatically extract an arbitrary 3d region from 3d image data (volume data), we have developed a physics-based approach using a 3ddeformable grid model, which we called "3d Active Grid". 3d Active Grid is an extension of 3ddeformable surface models, such as "balloon", and "3d Active Net". Unlike 3ddeformable surface models, the proposed method enables us stable extraction of a 3d region by using both boundary and interior information. Moreover since the generated geometry data can be input directly into FEM (Finite Element Method), 3d Active Grid has many potential applications including virtual simulation of surgery, shape modeling, computer vision, and so on.
We describe a geometric approach for reconstructing 3d textured graphical models of surface of revolution (SOR) objects from a single uncalibrated view, Our approach is based on the fact that, for the object class of ...
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ISBN:
(纸本)0769515223
We describe a geometric approach for reconstructing 3d textured graphical models of surface of revolution (SOR) objects from a single uncalibrated view, Our approach is based on the fact that, for the object class of interest, the structure of the scene provides enough constraints for camera calibration even from a single view. Reconstruction (lip to a scaling factor) of 3d shape is complemented with the extraction of flattened 2d texture, so as to support visual retrieval from 2d/3d cues and to generate realistic 3dvisualization models. The approach developed is quite simple, yet accurate and robust;its applications range from the preservation, analysis and classification of cultural heritage, to advanced graphics and multimedia.
In this paper we describe a new system for the 3d reconstruction anddistribution on the net of models for vessels structures. The system is specifically designed to support measurements of medical interest. We descri...
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ISBN:
(纸本)0769515215;0769515223
In this paper we describe a new system for the 3d reconstruction anddistribution on the net of models for vessels structures. The system is specifically designed to support measurements of medical interest. We describe 2d and3d segmentation methods implemented and the procedure used to build interactive VRML97 models. The experimental section presents a comparison between segmentation methods, and a first application to surgical planning for endovascular repair of Abdominal Aortic Aneurysms.
We propose a depth scaling method that enables visualization of arbitrary-shaped3d scenes on 3ddisplays. Most current 3ddisplays have a depth limitation, while the scene to be displayed has not. The trivial solutio...
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ISBN:
(纸本)0769522238
We propose a depth scaling method that enables visualization of arbitrary-shaped3d scenes on 3ddisplays. Most current 3ddisplays have a depth limitation, while the scene to be displayed has not. The trivial solutions as clipping or linear scaling of the scene's 3d bounding box suffer from non-optimal utilization of the display's capabilities. Our approach uses spatially adaptive depth scaling that maximizes the perceptual 3d effect. From the original scene geometry, the topology and local depth ordering among objects are preserved, while depth linearity is disregarded. The scaling method applies to nearly all 3ddisplays, such as glasses-based, head-tracked, multi-view, holographic and volumetric 3ddisplays. Subjective tests with the dynamic dimension display system show that our method significantly increases the perceptual 3d effect.
We seek to extract the three-dimensional motion of articulated objects by passive sensing. We first developed a multi-view system that segments objects from the background before their subsequent analysis by a motion ...
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ISBN:
(纸本)0769515215;0769515223
We seek to extract the three-dimensional motion of articulated objects by passive sensing. We first developed a multi-view system that segments objects from the background before their subsequent analysis by a motion model. To reduce the effects of noise, we also performed3d reconstruction prior to motion analysis to improve the extraction of the (static) background. The 3d extraction and motion analysis are both performed by evidence gathering, thus accruing optimality of performance. These new analyses are supported by a new representation which describes 3ddata with optimal fidelity.
In this paper we present a simple technique to approximate the volume enclosed by a given triangle mesh with a set of overlapping ellipsoids. This type of geometry representation allows us to approximately reconstruct...
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ISBN:
(纸本)0769515215;0769515223
In this paper we present a simple technique to approximate the volume enclosed by a given triangle mesh with a set of overlapping ellipsoids. This type of geometry representation allows us to approximately reconstruct 3d-shapes from a very small amount of information being transmitted. The two central questions that we address are: how can we compute optimal fitting ellipsoids that lie in the interior of a given triangle mesh and how do we select the most significant (least redundant) subset from a huge number of candidate ellipsoids. Our major motivation for computing ellipsoiddecompositions is the robust transmission of geometric objects where the receiver can reconstruct the 3d-shape even if part of the data gets lost during transmission.
This paper considers techniques for capturing 3d information from image sequences for applications in film and TV production. The potential applications fall into two classes, one requiring 3ddata that can be represe...
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ISBN:
(纸本)0769515215;0769515223
This paper considers techniques for capturing 3d information from image sequences for applications in film and TV production. The potential applications fall into two classes, one requiring 3ddata that can be represented as a depth map from a single viewpoint, and the other requiring a full 3d model. Applications for both classes of data are briefly reviewed, and current work on 3ddata capture in two EU-funded projects is described. The Meta Vision project is considering depth map acquisition, and results based on a three-camera stereo system are presented. The development of a multi-camera system using widely-separated cameras in a studio environment is being carried out as a part of the ORIGAMI project.
We present a method for the reconstruction of a 3d real object from a sequence of high-definition images. We combine two different procedures: a shape from silhouette technique which provides a coarse 3d initial model...
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ISBN:
(纸本)0769515223
We present a method for the reconstruction of a 3d real object from a sequence of high-definition images. We combine two different procedures: a shape from silhouette technique which provides a coarse 3d initial model followed by a multi-stereo caning technique. We propose a fast but accurate method for the estimation of the caning depth at each vertex of the 3d mesh. The quality of the final textured3d reconstruction models allows us to validate the method.
In this paper a real-time, handheld3d model acquisition system consisting of a laser projector a video camera and a turntable is described. The user projects a stripe of light at the 3d object by hand while rotating ...
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ISBN:
(纸本)0769522238
In this paper a real-time, handheld3d model acquisition system consisting of a laser projector a video camera and a turntable is described. The user projects a stripe of light at the 3d object by hand while rotating the object on a turntable. The projected light and LEd markers attached to the laser projector and turntable are captured by the video camera. By estimating the 3d orientation of the laser projector and the turntable angle from the 2d locations of the markers, the 3d location of the surface lit by the laser can be calculated. In addition, post-processing algorithms for refining the estimated3ddata have been proposed. The algorithm not only improves the accuracy of the 3d measurement, but also achieves to decrease the number of LEds for 3ddata estimation;therefore, it significantly improves the user's convenience in scanning the object. With this system, users can measure an entire 3d object in real-time.
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