In this paper we present an algorithm for adaptive resolution integration of 3ddata collected from multiple distributed sensors. The input to the algorithm is a set of 3d surface points and associated sensor models. ...
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We present an approach to surface smoothing based on linear diffusion. In contrast to mesh-based approaches we represent surfaces as scalar functions defined on the sphere which restricts the analysis to star-shaped o...
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Range image registration and surface reconstruction have been traditionally considered as two independent problems where the latter relies on the results of the former This paper presents a new approach to surface rec...
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ISBN:
(纸本)0769515215;0769515223
Range image registration and surface reconstruction have been traditionally considered as two independent problems where the latter relies on the results of the former This paper presents a new approach to surface recovery from range images where these two processes are integrated and performed in a common volumetric representation. The volumetric representation contains both implicitly represented reconstructed surface as the signeddistance field and cot-responding matching information in the form of the gradient of the distance field. This allows both simultaneous and incremental registration where matching complexity is linear with respect to the number of images. This improvement leads to incremental modeling from range image acquisition to surface reconstruction. It is shown that the approach is tolerant to initial registration errors as well as to measurement errors while keeping the details of the initial range images. The paper describes the formalism of the approach. Experimental results demonstrate performance advantages, tolerance to aforementioned types of errors and, as an application, filtering using redundant range data without loss of sharp details on the reconstructed surface.
Preliminary results of a new method for range view registration are presented. The method incorporates the LeRP Algorithm, which is a deterministic means to approximate subgraph isomorphisms. Graphs are formed that de...
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ISBN:
(纸本)0769515215;0769515223
Preliminary results of a new method for range view registration are presented. The method incorporates the LeRP Algorithm, which is a deterministic means to approximate subgraph isomorphisms. Graphs are formed that describe salient scene features. Graph matching then provides the scene-to-scene correspondence necessary for registration. A graphical representation is invariant with respect to sensor standoff. Test results from real and synthetic images indicate that a reasonable tradeoff between speed and accuracy is achievable. A mean rotational error of similar to1 degree was found for a variety of test cases. Mean compute times were found to be better than 2 Hz, with image sizes varying from 128x200 to 240x320. These tests were run on a 900 MHz PC The greatest challenge to this approach is the stable localization and invariant characterization of image features via fast, deterministic techniques.
We describe the goals of the ATTEST project, which started in March 2002 as part of the Information Society Technologies (IST) programme, sponsored by the European Commission. In the 2-year project, several industrial...
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Confocal microscopes have recently allowed biologists and biomedical researchers to obtain time dependent 3ddata sets of biological objects, such as cells and tissues. Scientific visualization can provide visual pres...
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ISBN:
(纸本)078037584X
Confocal microscopes have recently allowed biologists and biomedical researchers to obtain time dependent 3ddata sets of biological objects, such as cells and tissues. Scientific visualization can provide visual presentations of structural characteristics of these data sets. This paper addresses the role of virtual reality in gaining insight in these presentations. The understanding. of structural characteristics of time dependent 3d confocal biological data requires spatial judgments. Perceiving these characteristics is enhanced by using virtual reality technology. The advantage of virtual reality is particularly apparent in the exploration phase of the analysis when the behavior of the underlying biological processes is not a priori known.
Freehand three-dimensional (3d) ultrasound is a flexible imaging technique which allows a 3ddata set to be constructed of sequential B-scans from a conventional ultrasound scanner. Since the data is acquired over sev...
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ISBN:
(纸本)078037584X
Freehand three-dimensional (3d) ultrasound is a flexible imaging technique which allows a 3ddata set to be constructed of sequential B-scans from a conventional ultrasound scanner. Since the data is acquired over several seconds, physiological motion generates spatial artifacts in visualisations of the data. Consequently, an electrocardiogram (ECG) signal is often used to gate the acquisition of B-scans to a single point in the cardiac cycle. We present a technique which can remove temporal artifacts by using properties of the grey-scale B-scan data, obviating the need for an external gating signal. B-scans are acquired throughout the cardiac cycle, and any phase can be selected for subsequent visualisation. This enables limited real-time 4ddisplay of the data.
The development of a measurement system for the visualization, topological classification, and quantitative analysis of complex flows in large-scale wind tunnel experiments is described. A new approach was sought in w...
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The development of a measurement system for the visualization, topological classification, and quantitative analysis of complex flows in large-scale wind tunnel experiments is described. A new approach was sought in which the topological features of the flow (e.g., stream lines, separation and reattachment regions, stagnation points, and vortex lines) were extracteddirectly and preferably visualized in real-time in a virtual wind tunnel environment. The system was based on a stereo arrangement of two CCd cameras. A frame rate of 120fps allowed measurements at high flow velocities. The paper focuses on the problem of fast and accurate reconstruction of path lines of helium filled soap bubbles in three dimensions (3d). A series of simple algorithmic steps was employed to ensure fast dataprocessing. These included fast image segmentation, a spline approximation of the path lines, a camera model, point correspondence building, calculation of path line points in 3d and creation of a three-dimensional spline representation. The path lines, which contained both velocity and topological information, were analyzed to extract the relevant information.
Neuroscience research in the post-genomic era requires rapid screening and analysis of large tissue expanse. It demands close integration of information derived from histological procedures and genomic data. This is i...
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ISBN:
(纸本)078037584X
Neuroscience research in the post-genomic era requires rapid screening and analysis of large tissue expanse. It demands close integration of information derived from histological procedures and genomic data. This is impeded by the absence of technology to automatically extract histological information and to link it to genomic data. We are developing the necessary tools. At the core of these are atlases, visualization tools and registration algorithms. This paper describes a cooperative effort in research anddevelopment of these technologies.
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