Conceptual Model Of The Convergent Multistation Network Configuration Task

Abstract

Despite the potential of close range photogrammetry for high accuracy measurement, it has rarely been used by other than experienced photogrammetrists. One major contributing factor is the expertise needed to design multistation sensor configurations. This paper presents a conceptual model for the most fundamental task in this design problem, configuring a first approximation to a strong imaging geometry. This task entails making decisions on the number of camera stations needed and where they should be placed (positioned and oriented). The conceptual model is based on the theory of generic networks. A generic network constitutes compiled expertise, describing an ideal configuration of camera stations that can be employed to provide a strong imaging geometry for a class of network design problems. In addition to improving our understanding of cognition in network design, this model performs an important role in the development of an expert system for automated network design for dimensional inspection tasks.

Photogrammetric 3D modelling and mechanical analysis of masonry arches: An approach based on a discontinuous model of voussoirs

“…The maximum distance from the camera to the wall is estimated as a function of the expected average precision of the feature measurements, the expected image measurement coordinate precision, the number of photographs at each station and the principal distance of the camera; Ref. [18] provides more details.…”

“…Arias et al presented an approach to structural analysis based on photogrammetric models [15], and finally Schueremans and Van Genechten obtained the geometrical safety factor by limit analysis based on a terrestrial laser scanner (TLS) geometry survey of masonry vaults [16]. Some other interesting approaches for the use of photogrammetry in this field are described by Sonnenberg and Al-Mahaidi who used photogrammetry in lab tests to accurately measure the movement of concrete beams with shear reinforcement [17], by Mason who analysed the behaviour of structures with variable geometry [18], and by Jauregui et al who used photogrammetry for bridge inspections [19].…”

Research on network configurations of videogrammetry for the profile of gossamer inflatable antenna

“…Besides NS, there are some interdependent and competing factors which constrain the configuration of camera stations must be taken into account such as [6] :…”

Close-range constrained image sequences

“…This, however, is quite difficult to achieve. In order to get a proper solution, imaging has to be planned carefully by taking care of imaging circumstances.There have been many papers dealing with the problem of achieving a good imaging network (Fraser, 1982;Mason, 1995). For some applications, the requirements for accuracy can be rather strict.…”

“…There are many cases when this simply is not possible. The imaging method presented here is designed for special conditions where the traditional approach in the network design (Fraser, 1982;Mason, 1995) problem meets its limitations (e.g. when visibility is somehow compromised, as with very complex object structures).…”