This paper describes a technique for building a 3d volumetric model of an unknown surrounding based on data acquired by the IR Range Finder located on board a mobile robot. The paper presents all the steps needed for ...
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This paper describes a technique for building a 3d volumetric model of an unknown surrounding based on data acquired by the IR Range Finder located on board a mobile robot. The paper presents all the steps needed for the description of the environment, including measurement data acquisition, sample processing and3d surface-model reconstruction.
3d medical images represent tremendous amounts of data. Grid technologies offer large anddistributed computing power suited to medical images analysis. However, interactive programs with user supervision are made dif...
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3d medical images represent tremendous amounts of data. Grid technologies offer large anddistributed computing power suited to medical images analysis. However, interactive programs with user supervision are made difficult on a grid architecture due to the remote program execution. In this paper we propose a new framework for interactive execution of remote applications dealing with large 3d medical data sets. Our solution is both efficient and easy to use from the user point of view.
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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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 carving technique. We propose a fast but accurate method for the estimation of the carving depth at each vertex of the 3d mesh. The quality of the final textured3d reconstruction models allows us to validate the method.
Wavelet methods for geometry encoding is a recently emerged superset of multiresolution analysis which has proven to be very efficient in term of compression and adaptive transmission of 3d content. The decorrelating ...
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ISBN:
(纸本)0780376226
Wavelet methods for geometry encoding is a recently emerged superset of multiresolution analysis which has proven to be very efficient in term of compression and adaptive transmission of 3d content. The decorrelating power and space/scale localization of wavelets enable efficient compression of arbitrary meshes as well as progressive and local reconstruction. Recent techniques based on zerotree compression have shown to be among the best lossy mesh compression methods, while remaining compatible with selective transmission of geometric data at various level of detail. While some progressive reconstruction schemes have been proposed in the past, we show in this paper that this representation, recently proposed in the MPEG4 standard, can be efficiently used to perform real-time, view-dependent reconstruction of large meshes. The proposed system combines algorithms for local updates, cache management and server/client dialog. The local details management is an improvement of progressive reconstructions built on top of hierarchical structures. It enables fast, homogeneous accommodation and suppression of wavelet coefficients at any level of subdivision, with time complexity independent of the size of the reconstructed mesh. The cache structure wisely exploits the hierarchical character of the receiveddata, in order to avoid redundant information transmission. The whole system enables the client to have total control on the quality of navigation according to its storage andprocessing capabilities, whatever the size of the mesh.
The general concept of virtual reality system supported by data gathered by means of optical 3d shape measurement system is presented. The methodology of data filtering, coding and streaming in order to perform real-t...
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The general concept of virtual reality system supported by data gathered by means of optical 3d shape measurement system is presented. The methodology of data filtering, coding and streaming in order to perform real-time transmission of 3ddata into virtual reality is given. The concept of a virtual camera, as the mean for interactive object visualisation in VR environment is introduced. The details of data coding and filtering methods are given and their algorithmic implementation is described. The directions of future works focused on full implementation of the concept of hybrid experimental-numerical VR systems are discussed.
In this paper we describe a new system for the 3d reconstruction anddistribution on the Internet of models for vessel structures. The system is specifically designed to support measurements of medical interest. We de...
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In this paper we describe a new system for the 3d reconstruction anddistribution on the Internet of models for vessel 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 present a web-based prototype for the interactive search of items in quality electronic catalogues. Once a subset of images meeting the user's information needs have been identified, these images can be display...
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We present a web-based prototype for the interactive search of items in quality electronic catalogues. Once a subset of images meeting the user's information needs have been identified, these images can be displayed in a virtual exhibition that can be visited interactively by the user exploiting VRML technology.
A "Collaboratory" is a lightweight application component allowing project teams to collaborate and share data and insight while distributed over a network, using intuitive visual navigation techniques. The i...
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A "Collaboratory" is a lightweight application component allowing project teams to collaborate and share data and insight while distributed over a network, using intuitive visual navigation techniques. The innovation can be summarised as the integration of network technology used in collaborative games with a 3ddata navigation technique based on a low-level, fine-grained, customisable "atomic" visualization component infrastructure. The paper focuses on 3d medical imaging tools describing a Collaboratory implementation of a "Volume Viewer". This paper is also a blueprint to inform researchers and software engineers about the possibility to extend existing visualisation applications to support collaboration, e.g. making it easier to "collaboratize" visualization applications based on Microsoft's directX class library.
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