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.
Increasingly, models of the world are directly built from images. The paper discusses a number of recent developments that try to push the enveloppe of what image-based modeling can achieve. In particular the analysis...
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ISBN:
(纸本)0769515215;0769515223
Increasingly, models of the world are directly built from images. The paper discusses a number of recent developments that try to push the enveloppe of what image-based modeling can achieve. In particular the analysis of 3d surface deformations is discussed for face animation, the extraction of matches under wide baseline conditions for 3d scene reconstruction, and the synthesis of viewpoint dependent textures for realistic object rendering.
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.
In this paper a gesture recognition system using 3ddata is described. The system relies on a novel 3d sensor that generates a dense range image of the scene. The main novelty of the proposed system, with respect to o...
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ISBN:
(纸本)0769515223
In this paper a gesture recognition system using 3ddata is described. The system relies on a novel 3d sensor that generates a dense range image of the scene. The main novelty of the proposed system, with respect to other 3d gesture recognition techniques, is the capability for robust recognition of complex hand postures such as those encountered in sign language alphabets. This is achieved by, explicitly employing 3d hand features. Moreover the proposed approach does not rely on colour information, and guarantees robust segmentation of the hand under various illumination conditions, and content of the scene. Several novel 3d image analysis algorithms are presented covering the complete processing chain: 3d image acquisition, arm segmentation, hand-forearm segmentation, hand pose estimation, 3d feature extraction, and gesture classification. The proposed system is tested in an application scenario involving the recognition of sign-language postures.
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.
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.
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 summarizes the results from a Phd thesis concerned with the comparison between traditional and new three-dimensional (3d) surveying techniques from a user point of view. Three types of 3d surveying methods ...
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ISBN:
(纸本)0769515223
This paper summarizes the results from a Phd thesis concerned with the comparison between traditional and new three-dimensional (3d) surveying techniques from a user point of view. Three types of 3d surveying methods were tested. The three methods are manual survey combined with photographic texturing, 3d touch probe and3d laser scanner. A heritage-related object was picked according to a given method. For a user point of view, e.g. an architect or a 3d photographer, the knowledge of these different methods is fundamental in order to match a given object to be surveyed with the optimal survey procedure that will take full advantage of the data that the survey supplies to that user. Obviously the knowledge of the different methods is essential but so is the purpose of the project itself and the planning phase.
This paper describes the technique used to generate stereo pair images starting from a single image source (single view-point) and its relateddepth map. The conjunction between source image anddepth map allows recon...
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ISBN:
(纸本)0769515215;0769515223
This paper describes the technique used to generate stereo pair images starting from a single image source (single view-point) and its relateddepth map. The conjunction between source image anddepth map allows reconstructing artificially the binocular view producing a 3d effect depending on screen dimension and image resolution. The system does not reconstruct the real 3d-coordinates of any object inside the scene, but simply assigns the most comfortable shift to the source points to give a 3d-entertainment to the viewer. A simple smoothing filtering technique adaptively resolves the occlusions generated by shifting of the source points without introducing visible and/or annoying artifacts.
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