Cultural Heritages may greatly benefit from 3D digital reconstructions, which can be used to monitor both degradation phenomena and restoration Site URL List 1|]# activities, or to archive multimedia representations to be used for virtual reality systems [4]. The three-dimensional digitalization of an artwork typically requires the reconstruction of complex shapes with small details over large dimensions. However, great sizes and small geometrical details are usually conflicting attributes within a shape digitalization process.Optical techniques allow the reconstruction of artwork shapes by aligning high resolution range maps captured from different views into a common reference system [5�C8].
The crucial problem in combining multiple views is the computation of the Inhibitors,Modulators,Libraries best transformation parameters (translation and rotation), which relate range maps to a common reference system [9].
The integration between 3D optical sensors and mechanical devices (i.e., turntables, robotic arms, Inhibitors,Modulators,Libraries coordinate measurement machines) could be a valid solution Inhibitors,Modulators,Libraries to the automatic alignment of large data sets [10,11]. However, Inhibitors,Modulators,Libraries the mechanical devices typically lack in flexibility due to restrictions in size and complexity of the measureable shapes. Moreover, these systems are hardly portable for in situ measurement activities.Alternatively, the multi-view Inhibitors,Modulators,Libraries alignment can be automatically performed by measuring the 3D coordinates of physical references, which can be either distributed over the scene or rigidly connected to the optical sensor.
The distribution of fixed targets on the background generally requires a preliminary planning of the reconstruction strategy.
Inhibitors,Modulators,Libraries This approach could limit the flexibility of the measurement process, since the working environment is not always suitable for a proper distribution of physical references [12,13]. The reference-based approach could be efficiently improved Inhibitors,Modulators,Libraries by physically connecting the references to the range map sensor in order to progressively track its spatial placements by an independent vision system [14]. Although some industrial proposals GSK-3 [15,16] have provided alignment procedures based Inhibitors,Modulators,Libraries on combining two imaging sensors, their extension to Cultural Heritage still requires further researches focused Anacetrapib on in situ measurements of large sculptural artworks with small details.
This paper aims at introducing a multi-sensor framework dedicated to the Cultural Heritage field.
The methodology is based on integrating two portable optical sensors: a structured light scanner and a passive stereo-photogrammetric device. In particular, high resolution range List 1|]# maps are acquired by a scanner based on structured lighting and encoded pattern analysis. The complete reconstruction of an artwork shape is obtained through a multi-view process consisting in capturing 3D range maps from different views and transposing them into a global coordinate system.
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