نتایج جستجو برای: geometrical reconstruction
تعداد نتایج: 151102 فیلتر نتایج به سال:
Since the discovery of nuclear gamma-rays, its imaging has been limited to pseudo imaging, such as Compton Camera (CC) and coded mask. Pseudo imaging does not keep physical information (intensity, or brightness in Optics) along a ray, and thus is capable of no more than qualitative imaging of bright objects. To attain quantitative imaging, cameras that realize geometrical optics is essential, w...
Automatic analysis of tongue movement in large existing cineradiographic databases can provide valuable information to understood speech production. We describe here a method for semi-automatic extraction of articulatory information from video observation in order to derive quasi-automatically a geometrical parameterization of the vocal tract movements. The algorithm starts with a limited manua...
The concept of numerical Kekulé structures is used for coding and ordering geometrical (standard) Kekulé structures of several classes of polycyclic conjugated molecules: catacondensed, pericondensed, and fully arenoid benzenoid hydrocarbons, thioarenoids, and [N]phenylenes. It is pointed out that the numerical Kekulé structures can be obtained for any class of polycyclic conjugated systems tha...
An inverse problem motivated by the nondestructive testing (NDT) of adhesively bonded structures used in the aircraft industry is studied. Using transmission line theory, a model is developed which, when supplied with electrical and geometrical parameters, accurately predicts the reflection coefficient associated with such structures. Particular attention is paid to modelling the connection bet...
Quasi-automatic extraction of tongue movement from a large existing speech cineradiographic database
Automatic analysis of tongue movement in large existing cineradiographic databases can provide valuable information to understood speech production. We describe here a method for semi-automatic extraction of articulatory information from video observation in order to derive quasi-automatically a geometrical parameterization of the vocal tract movements. The algorithm starts with a limited manua...
Multi-scale geometrical and topological analyses of point clouds can reveal their rich structures. Because conformal alpha shapes of point clouds are hierarchical shapes under different mesh resolution or internal alpha values, their surface curvature estimations are one of the multi-scale geometrical analyses. We present a robust method for computing surface curvature of conformal alpha shapes...
The model here proposed simulates the development of the object recognition capability, assuming that recognition does not imply any sort of explicit geometrical reconstruction and emerges as result of interactions between epigenetic influences and basic neural plasticity mechanisms. The model is a hierarchy of artificial neural maps, mainly based on the LISSOM architecture, achieving self-orga...
The high-energy-limit of the scattering operator for multidimensional relativistic dynamics, including a Dirac particle in an electromagnetic eld, is investigated by using time-dependent, geometrical methods. This yields a reconstruction formula, by which the eld can be obtained uniquely from scattering data.
This paper describes a new technique for global shape improvement based upon features’ positions and geometrical constraints. It suggests a general incremental, framework whereby constraints can be added and integrated in the model reconstruction process, resulting in an optimal trade-off between minimization of the shape fitting error and the constraints’ tolerances. The objects treated are in...
Line projections in non-central systems contain more geometric information than central systems. The four degrees of freedom of the 3D line are mapped to the line-image and the 3D line can be theoretically recovered from 4 projecting rays (i.e. line-image points) from a single non-central view [3]. If the non-central system is properly calibrated we obtain a metric reconstruction of the 3D line...
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