We propose artificial potential fields as a support theory for a feature linking algorithm. This algorithm operates on 3d triangle meshes derived from multiple range scans of an object, and the features of interest ar...
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In this paper, a system for the visualization and entry of 3d stratigraphic layers into a new Geographic Information System (GIS) based on the varying and sometimes incomplete records of the field archaeologist is pre...
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ISBN:
(纸本)0769515223
In this paper, a system for the visualization and entry of 3d stratigraphic layers into a new Geographic Information System (GIS) based on the varying and sometimes incomplete records of the field archaeologist is presented This paper presents a computer-based system that allows for incomplete and ambiguous data, indicating problems associated with this entry and shows how inaccuracies are represented so that later misinterpretation is avoided.
It is common when analyzing experimental data to encounter matrices that have been contaminated by noise and have missing elements. Missing data can be recovered with imputation methods if the measurement data matrix ...
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ISBN:
(纸本)9780769528250
It is common when analyzing experimental data to encounter matrices that have been contaminated by noise and have missing elements. Missing data can be recovered with imputation methods if the measurement data matrix is of low rank and the data is noise-free. However, iterative imputation can produce poor results for cases of large not. se or a large proportion of missing data. Non-imputing methods rely on the use of existent data and require a selection of complete submatrices. Jacobs introduced a non-imputing method which can produce good results, but the randomness in selecting the submatrices cannot guarantee a consistently accurate recovery of missing data. Chen and Suter's method chooses the most reliable submatrix based on the number of missing data elements only, which fails to consider the effect of noise on the selecteddata. Herein, a new criterion based on an estimate of the sensitivity of submatrices to perturbation is introduced which takes into consideration that in some cases a column with more missing data could provide more useful information than one with less missing data. Experimental results for the problem of Structure from Motion with noisy point correspondences and missing data show that our criterion can sort submatrices properly in terms of their possible perturbation and recover the 3d structure of the scene more accurately than other non-imputing methods.
We present a stereo algorithm that achieves high quality results while maintaining real-time performance. The key idea is simple: we introduce an adaptive aggregation step in a dynamic-programming (dP) stereo framewor...
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ISBN:
(纸本)9780769528250
We present a stereo algorithm that achieves high quality results while maintaining real-time performance. The key idea is simple: we introduce an adaptive aggregation step in a dynamic-programming (dP) stereo framework. The per-pixel matching cost is aggregated in the vertical direction only. Compared to traditional dP our approach reduces the typical "streaking" artifacts without the penalty of blurry object boundaries. Evaluation using the benchmark Middlebury stereo database shows that our approach is among the best (rankedfirst in the new evaluation system) for dP-based approaches. The performance gain mainly comes from a computationally expensive weighting scheme based on color anddistance proximity. We utilize the vector processing capability and parallelism in commodity graphics hardware to speed up this process over two orders of magnitude. Over 50 million disparity evaluations per second (MdE/s)(1) are achieved in our current implementation.
In this paper, we describe 3WPS, a framework to builddistributed systems that are able to monitor and interact with a process via a 3d interface that is accessible via the World Wide Web. 3WPS is easily configurable,...
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ISBN:
(纸本)0769515223
In this paper, we describe 3WPS, a framework to builddistributed systems that are able to monitor and interact with a process via a 3d interface that is accessible via the World Wide Web. 3WPS is easily configurable, easily adaptable to different processes with high reuse of its software components and its distributed architect re leverages on off-the-shelf components of the infrastructure such as Java applets and VRML browsers.
For the first time since computers are around, the major pieces of the puzzle are in place to deliver interactive 3d to the average end user. Yet, with the exception of games and some e-commerce applications, the take...
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ISBN:
(纸本)0769515223
For the first time since computers are around, the major pieces of the puzzle are in place to deliver interactive 3d to the average end user. Yet, with the exception of games and some e-commerce applications, the take-up of 3d remains slow. This paper surveys current issues related to the potential of 3d for IST applications and gives an overview of activities most relevant to 3d research. The EUs 6(th) Framework Programme is also briefly discussed and orientations for the integration of imaging and3d research are proposed.
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.
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-...
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ISBN:
(纸本)0769515223
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.
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 diff...
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ISBN:
(纸本)0769515215;0769515223
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.
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