Abstract
Abstract. Dense matching techniques, implemented in many commercial and open source software, are useful instruments for carrying out a rapid and detailed analysis of complex objects, including various types of details and surfaces. For this reason these tools were tested in the metric survey of a frescoed ceiling in the hall of honour of a baroque building. The surfaces are covered with trompe-l’oeil paintings which theoretically can give a very good texture to automatic matching algorithms but in this case problems arise when attempting to reconstruct the correct geometry: in fact, in correspondence with the main architectonic painted details, the models present some irregularities, unexpectedly coherent with the painted drawing. The photogrammetric models have been compared with data deriving from a LIDAR survey of the same object, to evaluate the entity of this blunder: some profiles of selected sections have been extracted, verifying the different behaviours of the software tools.
Highlights
Today the need for a digital metric survey which is even more suitable for acquiring 3D data and for generating 3D detailed models obliges the operators responsible for the documentation and preservation of Cultural Heritage to deal with the methodology and techniques developed for 3D data recording
The two models obtained from the image-matching software tools were reasonably accurate considering the 1:50 representation scale: the maximum differences are inferior to 2 cm in both cases, even if the remaining errors are distributed in different ways, as doi:10.5194/isprsannals-II-5-97-2014
According to the results obtained it is clear that both the photogrammetry – image matching softwares are suitable for reconstructing the general geometry some defects are observed in both cases
Summary
Today the need for a digital metric survey which is even more suitable for acquiring 3D data and for generating 3D detailed models obliges the operators responsible for the documentation and preservation of Cultural Heritage to deal with the methodology and techniques developed for 3D data recording. 3D modelling deriving from this kind of digital survey (both active or passive sensors) are deemed to provide more details and appear to be quicker than other survey systems These models enable us to obtain shape documentation and thematic characterizations which are more sustainable in terms of costs (especially when using the digital photogrammetry techniques) and regarding the amount of available information compared to that obtained from other systems. The traditional mainstream models, plans, front and cross sections, 3D models generated by plane entities, rotation surfaces or generally surfaces with known equations, can obviously be textured by orthoimages They differ to those derived from digital survey due to the totally manual generation, adding to minor accuracy and lower adjacency to real objects. The level of accuracy achieved using the techniques proposed and the errors observed are reported in the discussion section
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