Dense Image Matching for metric information retrieval using non-metric cameras and documentation shots

Abstract

Dense Image Matching and Structure – from – Motion (SfM) techniques are used to orient a posteriori a set of photos realized during
a restoration intervention on a church façade. The photos were taken to provide quality and hurried documentation to some
discovered historical stratifications. Images were captured with a non-professional camera, neither following correct photogrammetry
acquisition, nor considering optimal requirements for digital photogrammetry software processing. Images were processed, using
different applications and algorithms, and a 3D model was generated which was useful to store information about the façade
geometry.
From this the drawing of ancient stratification tracks can be plotted, making it possible to recover an otherwise lost metric
information, which is very important to the Monument documentation.