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 addresses the problem of segmenting 3d scan data of human body (HB) into sets corresponding to the HB parts, where the posture of the body is unknown. The approach consists in recognizing first the posture,...
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ISBN:
(纸本)0769515223
This paper addresses the problem of segmenting 3d scan data of human body (HB) into sets corresponding to the HB parts, where the posture of the body is unknown. The approach consists in recognizing first the posture, then exploiting the information retrieved from the posture recognition into the segmentation process. For the recognition, the wavelet transform coefficients (WTC) are suggested as new 3d shape descriptors. Then Segmentation technique integrating the model posture information is presented. The segmentation results are illustrated on human body scans of different postures.(1).
New data sources and sensors bring new possibilities for terrain representations, and new types of characteristic errors. We develop a system to visualize and compare terrain representations and the errors they produce.
ISBN:
(纸本)9780769528250
New data sources and sensors bring new possibilities for terrain representations, and new types of characteristic errors. We develop a system to visualize and compare terrain representations and the errors they produce.
In this paper we describe exact and heuristic algorithms for the comparison of 3d structures via their contact maps. Given two contact maps, we consider the problem of finding the optimal sequence-order dependent and ...
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ISBN:
(纸本)0769515223
In this paper we describe exact and heuristic algorithms for the comparison of 3d structures via their contact maps. Given two contact maps, we consider the problem of finding the optimal sequence-order dependent and sequence order independent alignments. We describe an integerprogramming formulation of the problems along with a Lagrangian relaxation yielding stronger bounds than previous approaches. This relaxation is used to drive both a greedy heuristic capable of finding near-optimal solutions and an exact branch-and-bound algorithm. We report computational results for an application of our model to the problem of aligning 3d structures of folded proteins from the Protein data Bank.
The standard way of remotely visualizing virtual worlds is downloading the virtual world to the user's computer, then rendering it. This approach is plagued by many problems which can be overcome by moving the ren...
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ISBN:
(纸本)0769515223
The standard way of remotely visualizing virtual worlds is downloading the virtual world to the user's computer, then rendering it. This approach is plagued by many problems which can be overcome by moving the rendering at server's side and by essentially turning interactive visualization into an image transmission problem. How to effectively compress the rendered views which need to be transmitted to the client is a fundamental issue within this remote visualization scenario. This work presents an original compression scheme for remote visualization based on image based rendering. A remote visualization system incorporating this compression method was implemented and its experimental performance is discussed.
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.
3d objects are an important type of multimedia data with many promising application possibilities. defining the aspects that constitute the similarity among 3d objects, anddesigning algorithms that implement such sim...
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ISBN:
(纸本)0769522238
3d objects are an important type of multimedia data with many promising application possibilities. defining the aspects that constitute the similarity among 3d objects, anddesigning algorithms that implement such similarity definitions is a difficult problem. Over the last few years, a strong interest in methods for feature-based3d similarity search has arisen, and a growing number of competing algorithms for content-based retrieval of 3d objects have been proposed. We present an extensive experimental evaluation of the retrieval effectiveness and efficiency of a large part of the current state-of-the-art feature-based methods for 3d similarity search, giving a contrasting assessment of the different approaches.
This work proposes a system for the automatic construction of multi-spectral 3d models of architecture. Besides the specific application which concerns the interactive visualization and the restoration of historical b...
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ISBN:
(纸本)9780769528250
This work proposes a system for the automatic construction of multi-spectral 3d models of architecture. Besides the specific application which concerns the interactive visualization and the restoration of historical buildings, the interest of the proposed techniques lays in the multi-spectral nature of the textures which allow rendering with faithful colors and in the automatism of 3d model construction. The proposed system is an effective tool for producing 3d content amenable to a great number of applications.
Archaeology is a destructive process in which accurate anddetailed 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 d...
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ISBN:
(纸本)0769522238
Archaeology is a destructive process in which accurate anddetailed 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 sophisticatedvisualization 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.
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.
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