This paper describes the work performed for the ARCHEOGUIdE (Augmented Reality-based Cultural Heritage On-site GUIdE) project. ARCHEOGUIdE is funded by the EU 1ST framework (1ST-1999-11306), and pursued by a consortiu...
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ISBN:
(纸本)0769515223
This paper describes the work performed for the ARCHEOGUIdE (Augmented Reality-based Cultural Heritage On-site GUIdE) project. ARCHEOGUIdE is funded by the EU 1ST framework (1ST-1999-11306), and pursued by a consortium of European organisations. It delivers an interactive, personalized, augmented reality, (A R) guide for the visualization of ruined archaeological sites. It is based on mobile real-time computing, networking and3dvisualization. Its users are presented with monument reconstructions, navigation aid and historical information in a user-friendly way through the use of multi-modal interaction techniques. The key features of the system are a novel hybrid position and orientation tracking technique used in determining the user's viewpoint, navigation aid, outdoor operation, and real-time 3dvisualization of monuments, artifacts, and life. This paper presents examples of the system's use at the archaeological site of Ancient Olympia in Greece.
In this paper, we propose an efficient low complexity geometry compression scheme for densely sampled irregular 3d meshes. This scheme is based on 3d multiresolution analysis (3ddiscrete Wavelet Transform) and includ...
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ISBN:
(纸本)0769515223
In this paper, we propose an efficient low complexity geometry compression scheme for densely sampled irregular 3d meshes. This scheme is based on 3d multiresolution analysis (3ddiscrete Wavelet Transform) and includes a model-based bit allocation process across the wavelet subbands. Coordinates of 3d wavelet coefficients are processed separately and statistically modeled by a generalized Gaussian distribution. This permits an efficient allocation even at low bitrate with very low complexity. Moreover, we introduce predictive geometry coding of LF subbands by taking in account the correlation of the coarsest level coefficients. Finally, we use EBCOT coder to efficiently encode the quantized coefficients.
This paper presents a 3d reality modelling system, applying lasers anddigital photography to create super-accurate photo-realistic three-dimensional worlds. A key feature of the 3d reality system is its flexibility. ...
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ISBN:
(纸本)0769515215;0769515223
This paper presents a 3d reality modelling system, applying lasers anddigital photography to create super-accurate photo-realistic three-dimensional worlds. A key feature of the 3d reality system is its flexibility. It can be used with all common long-range scanners anddigital or video cameras, without the need of any pre-calibration or static arrangement between the different sensors. The system can be used for a wide range of applications in industry and science, as well as for environmental modelling and virtual reality presentations. The 3d models are sufficiently lifelike to be used in sectors such as real estate, culture heritage and construction. Results can be exported to all major 3d software and CAd packages or viewed via a web browser.
In this paper we describe anddemonstrate our technology for creating super high resolution & 3ddigital content for a variety of applications including museum artifacts and galleries, archeology, anthropology, ar...
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ISBN:
(纸本)0769515223
In this paper we describe anddemonstrate our technology for creating super high resolution & 3ddigital content for a variety of applications including museum artifacts and galleries, archeology, anthropology, art design and heritage conservation. Our hardware can capture minute details of static scenes in a composite panoramic format with details surpassing the human eye. We also propose an approach to storing SHR 3d images for efficient retrieval over bandwidth limited networks, such as the Internet. Regions of interest specified by users are stored in multiple levels of detail hierarchy. An implementation of the browser for Virtual Museums is also presented. In addition to browsing images, our software provides the ability to support "interactive story telling." As viewers interact with a picture using a mouse, the descriptions of objects in the scene appear depending on the location of the mouse and the level of detail in the scene. Finally, the "Zoomagge" tools can be used by academic researchers for various applications including object recognition, digital archiving, accurate stereo reconstruction, and3dvisualization.
Recent developments in 3d technologies and measurement instrumentation combined with multimedia databases offer today new possibilities for the integrated and complete description of Cultural Heritage objects. A first...
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ISBN:
(纸本)0769515223
Recent developments in 3d technologies and measurement instrumentation combined with multimedia databases offer today new possibilities for the integrated and complete description of Cultural Heritage objects. A first attempt is made to develop a database for archaeological ceramic and glass artifacts where in addition to the digitized 2d and3d images, description, typological characteristics and historical information for each artifact will also include point-wise surface data. In a pilot implementation, physicochemical data mapped on the surface of the 3ddigital image of the object will be included. Thus, the researcher will have the entire information regarding the specific artifact at his disposal. This information will contribute significantly, to the comparative study of artifacts, provenance studies, determination of weathering, authentication anddetection of forgery, inspection of past restorations etc.
As products of second-order computations, estimations of principal curvatures are highly sensitive to noise. due to the availability of more accurate 3d range imaging equipment, evaluation of existing algorithms for t...
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ISBN:
(纸本)0769515215;0769515223
As products of second-order computations, estimations of principal curvatures are highly sensitive to noise. due to the availability of more accurate 3d range imaging equipment, evaluation of existing algorithms for the extraction of these invariants and other useful features from discrete 3ddata, is now relevant. The work presented here, makes some subtle but very important modifications to two such algorithms, originally suggested by Taubin [14] and Chen and Schmitt [2]. The algorithms have been adjusted to deal with real discrete noisy range data. The results of this implementation were evaluated in a series of tests on synthetic and real input yielding reliable estimations. Our conclusion is that with current scanning technology and the algorithms presented here, reliable estimates of the principal curvatures and the darboux frame can be extracted from real data and used in a variety of more comprehensive tasks.
In this paper we present a three-dimensional model retrieval system. In our approach, a three-dimensional model is described by, three invariant descriptors: a curvature index which consists of a histogram of the prin...
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ISBN:
(纸本)0769515215;0769515223
In this paper we present a three-dimensional model retrieval system. In our approach, a three-dimensional model is described by, three invariant descriptors: a curvature index which consists of a histogram of the principal curvatures of each face of the mesh, a histogram of distances between the faces, and a histogram of the volumes based on each face. This work focuses on extracting these invariant descriptors from the three-dimensional models, and on combining these descriptors in order to improve retrieval performance. An experimental evaluation demonstrates the satisfactory performance of our approach on a fifty, three dimensional models database.
This paper presents a computer vision stereo based interface to navigate inside a 3-d Internet city, using bode, gestures. A wide-baseline stereo pair of cameras is used to obtain 3-d body, models of the user's ha...
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ISBN:
(纸本)0769515223
This paper presents a computer vision stereo based interface to navigate inside a 3-d Internet city, using bode, gestures. A wide-baseline stereo pair of cameras is used to obtain 3-d body, models of the user's hands and head in a small desk-area environment. The interface feeds this information to an HMM gesture classifier to reliably recognize the user's browsing commands. To illustrate the features of this interface we describe its application to our 3-d Internet browser which facilitates the recollection of information by organizing and embedding it inside a virtual city through which the user navigates.
View-based3d video streaming requires the compression andtransmission of depth maps along with the video sequence. The requirements for representing these depth maps include moderately, high compression, preservatio...
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ISBN:
(纸本)0769515215;0769515223
View-based3d video streaming requires the compression andtransmission of depth maps along with the video sequence. The requirements for representing these depth maps include moderately, high compression, preservation of depth discontinuities, low complexity decoding, and to be in a form that is suitable for real-time rendering using graphics cards. This motivates a mesh-based representation for the depth map. We adapt a mesh generation algorithm used in real-time height field rendering for depth map representation and produce a regular mesh for each depth map. Then we propose a compression technique that encodes the triangulateddepth map as a set of single bit enabled flags that mark the split of triangles, anddepth values at the vertices with Huffman code. By coding the vertices in the rendering order, we achieve depth map decoding and striped triangles for OpenGL based rendering in one loop, thus greatly, reducing the complexity, at the rendering end.
Ultrasound imaging is a helpful aid for diagnosis in many medical specialities. In order to enhance the information available to the examiner, an upcoming approach is to compound the sequence of video images into a si...
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ISBN:
(纸本)0769515223
Ultrasound imaging is a helpful aid for diagnosis in many medical specialities. In order to enhance the information available to the examiner, an upcoming approach is to compound the sequence of video images into a single 3d volume, which needs a real-time tracking of the transducer However, errors in the positioning occur and the compounded image becomes degraded. We propose a method which automatically corrects the positioning error by, means of a registration step between the live ecography and the compounded volume. The algorithm has been tested on sequences taken on an in-vitro human brain.
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