A method for modelling and visualizing human lungs using knowledge of lung anatomy and High Resolution CT (HRCT) images is presented. The model consists of. a symbolic description of lung anatomy and a 3d atlas. The 3...
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ISBN:
(纸本)0769522238
A method for modelling and visualizing human lungs using knowledge of lung anatomy and High Resolution CT (HRCT) images is presented. The model consists of. a symbolic description of lung anatomy and a 3d atlas. The 3d atlas is constructed using HRCT volume data. A few anatomical landmarks are determined and are used to divide the lungs into anatomically anddiagnostically important regions. The landmarks and the lung regions enable accurate mapping of the model to patient data and enable the system to deal with image and human variability. The model can be displayed as a set of labelled axial slices and as a 3d model of the lungs. The 3dvisualization enables rotation and viewing of lung structures, lung features and lung regions from different angles.
Structured grids and some of their applications in natural sciences are discussed. The problem of their visualization and quantitative evaluation is considered and possible ways for its solution sketched. Resampling a...
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ISBN:
(纸本)0769522238
Structured grids and some of their applications in natural sciences are discussed. The problem of their visualization and quantitative evaluation is considered and possible ways for its solution sketched. Resampling a structured grid onto a regular one is such a possible solution offering the additional benefit of enabling quantitative evaluations, too. This resampling is achieved by a preliminary tetrahedronization of the structured grid(s) and a subsequent digitalization of the constituent tetrahedrons using an adaptation of the 3d-Bresenham algorithm. Advantages anddisadvantages of this approach as compared to other possible schemes are discussed. An implementation based on our open source f3d-file format for storage andtransmission of volumetric data is presented, and results from applying it to real-worlddata shown.
Recent efforts attempt to combine together information of different passive methods. Critical issues in this research are the choice of data and how to combine such data in order to increase the overall information. T...
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ISBN:
(纸本)9780769528250
Recent efforts attempt to combine together information of different passive methods. Critical issues in this research are the choice of data and how to combine such data in order to increase the overall information. The combination of stereo matching and silhouette information has recently received considerable attention both for obtaining high quality 3d models and for modelling 3ddynamic scenes. In this paper we present a 3d shape recovery system which fuse together silhouette, texture and shadow information. More precisely, we formulate the fusion problem of these three types of information. Experimental verification shows that the new method is capable to reconstruct a wider range of objects.
This paper addresses the problem of remote browsing of 3d scenes. Texture and geometry information are both available at server side in the form of scalably compressed images anddepth maps. We propose a framework for...
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ISBN:
(纸本)9780769528250
This paper addresses the problem of remote browsing of 3d scenes. Texture and geometry information are both available at server side in the form of scalably compressed images anddepth maps. We propose a framework for the dynamic allocation of the available transmission resources between geometry and texture. Both the transmission of new images and the improvement of the already transmitted ones are taken into account. We also introduce a novel strategy for distortion-sensitive synthesis of both geometry and rendered imagery at client side.
In this paper we derive a novel set of projective invariants and we address the problem of homography estimation between two uncalibrated views from two unmodeled coplanar conics. Exploring in each view the eigenvecto...
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ISBN:
(纸本)9780769528250
In this paper we derive a novel set of projective invariants and we address the problem of homography estimation between two uncalibrated views from two unmodeled coplanar conics. Exploring in each view the eigenvectors of a matrix composed from the conics matrices and pole-polar relationships, we show that homography can be recovered purely geometrical from invariant points and simple intersections avoiding high-order polynomials and non linear equations. Our method has advantages compared with other approaches, is simple and computational efficient. The estimation process is basically linear and there are no ambiguities on the solution. Furthermore it requires neither that the physical models of the conics are known nor that the cameras are calibrated. Experimental results in both simulate data and real images show that our approach is very robust and can be efficiently used for a large number of applications
We propose a fast 3d model acquisition system that aligns intensity, anddepth images, and reconstructs a textured3d mesh. 3d views are registered with shape alignment based on intensity gradient constraints and a gl...
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ISBN:
(纸本)0769515215;0769515223
We propose a fast 3d model acquisition system that aligns intensity, anddepth images, and reconstructs a textured3d mesh. 3d views are registered with shape alignment based on intensity gradient constraints and a global registration algorithm. We reconstruct the 3d model using a new Cubic Ray, Projection merging algorithm which takes advantage of a novel data structure: the linked voxel space. Finally, we present experiments to test the accuracy of our approach on 3d face modeling using real-time stereo images.
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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ISBN:
(纸本)0769515215;0769515223
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 3ddata navigation technique based on a low-level, fine-grained, customisable "atomic" visualization component infrastructure. In this paper we have focused 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.
The Virtual Boutique is an e-commerce environment based on virtual reality and content-based management Of three-dimensional information. The boutique and its content arc virtualized with laser scanners and photogramm...
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ISBN:
(纸本)0769515223
The Virtual Boutique is an e-commerce environment based on virtual reality and content-based management Of three-dimensional information. The boutique and its content arc virtualized with laser scanners and photogrammetric techniques. Algorithms for searching the boutique inventory by three-dimensional shape and image content are described. Business rules are data mined from the interaction of the consumer with the boutique in a virtual environment.
In this paper, we introduce a new system for face recognition by matching 3d face shape. This algorithm selects multiple regions of the face for matching in an attempt to reduce the effects caused by variations in exp...
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ISBN:
(纸本)9780769528250
In this paper, we introduce a new system for face recognition by matching 3d face shape. This algorithm selects multiple regions of the face for matching in an attempt to reduce the effects caused by variations in expression between gallery and probe images. Experimental results are reported using the Face Recognition Grand Challenge v2.0 data set. Our results demonstrate improved performance relative to those of four previous papers using this same data set.
The problem of virtual view creation has received increasing attention in recent years. Major current approaches are based on modified stereo vision systems. Recently the structure light measurement system based on di...
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ISBN:
(纸本)0769522238
The problem of virtual view creation has received increasing attention in recent years. Major current approaches are based on modified stereo vision systems. Recently the structure light measurement system based on digital light projection supported by special data coding andprocessing allow to rapid3d shape acquisition. Application of this technology to record3ddata has increased significantly the accuracy of reconstructed shape and simplifieddata manipulation process. In the paper the general concept of virtual reality system supported by data gathered by means of structure light projection is presented. The methodology of conversion of cloud of measurement points (x,y,z,R,G,B) into virtual reality environment is described. It is supported by implementation of a virtual camera concept, as the mean for interactive object visualization. The methodology of real time 3d object visualization based on its coding by means of specially formed contours and their B-spline approximation is presented. The applicability of the methodology has been shown on numerically generateddata which simulate performance of the measurement system. The total processing path was successfully tested.
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