نتایج جستجو برای: point data

تعداد نتایج: 2801551  

Journal: :Computers & Geosciences 2015
Lei Fan Joel A. Smethurst Peter M. Atkinson William Powrie

Terrestrial laser scanning (TLS) has been used widely for various applications, such as measurement of movement caused by natural hazards and Earth surface processes. In TLS surveying, registration and georeferencing are two essential steps, and their accuracy often determines the usefulness of TLS surveys. So far, evaluation of registration and georeferencing errors has been based on statistic...

2005
Shen-Shyang Ho Harry Wechsler

Introduction In a data streaming setting, data points are observed one by one. The concepts to be learned from the data points may change infinitely often as the data is streaming. We extend the idea of testing exchangeability online [2] to a martingale framework to detect concept changes in time-varying data streams [P1]. •Two martingale tests using: (i) martingale values (MT1) and (ii) the ma...

1992
P. Fua

Most active and passive range nding techniques yield unstructured and generally noisy 3D points. In order to build useful world representations , one must be able to remove spurious data points and group the remaining into meaningful surfaces. In this paper, we propose an approach based on tting local surfaces. Diierential properties of these surfaces are rst used iteratively to smooth the poin...

Journal: :CoRR 2012
Hanchao Qi Shannon M. Hughes

In this technical report, we will make two observations concerning symmetries of the probability distribution resulting from projection of a piece of p-dimensional data onto a random m-dimensional subspace of $\mathbb{R}^p$, where m<p. In particular, we shall observe that such distributions are unchanged by reflection across the original data vector and by rotation about the original data vector

Journal: :Computer Aided Geometric Design 2004
Martin Peternell

Given a set of data points as measurements from a developable surface, the present paper investigates the recognition and reconstruction of these objects. We investigate the set of estimated tangent planes of the data points and show that classical Laguerre geometry is a useful tool for recognition, classification and reconstruction of developable surfaces. These surfaces can be generated as en...

1998
Yasukuni Mori Mineichi Kudo Jun Toyama Masaru Shimbo

A method for visualizing the structure of classes using a graph is proposed. Unlike the previous approaches of mapping data points onto a plane, this method represents a few sets of data points as nodes of the graph. From the sizes of the nodes and the widths of the links connecting the nodes, we can know how complex the structure is and to what degree the classes are separable. The experimenta...

2014
Amy Perfors Keith Ransom Daniel J. Navarro

Many theoretical accounts of generalization suggest that with increasing data, people should tighten their generalizations. However, these accounts presume that the additional data points are all distinct. Other accounts, such as the adaptor grammar framework in linguistics (Johnson, Griffiths, & Goldwater, 2007), suggest that when the additional data points are identical, generalizations about...

2017
Giuseppina Turco Karim Shoul Rachid Ridouane

We investigate the durational properties of Moroccan Arabic identical consonant sequences contrasting singleton (S) and geminate (G) dental fricatives, in six combinations of fourlevel length contrasts across word boundaries (#) (one timing slot for #S, two for #G and S#S, three for S#G and G#S, and four for G#G). The aim is to determine the nature of the mapping between discrete phonological t...

Journal: :Neural Computation 1992
David J. C. MacKay

Learning can be made more efficient if we can actively select particularly salient data points. Within a Bayesian learning framework, objective functions are discussed that measure the expected informativeness of candidate measurements. Three alternative specifications of what we want to gain information about lead to three different criteria for data selection. All these criteria depend on the...

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