Photogrammetric processes and augmented reality applications using mobile devices

This contribution shows the first results of a research "in fieri", which aims to introduce low-cost instruments for the continuous monitoring of architectures. The use of these devices in the architectural field is of great interest to the scientific community and therefore, with the aim of researching rapid mapping methodologies, the integrated camera on the new iPhone 12PRO is analyzed and then compared with the NikonD5000 reflex camera, whose use is more consolidated. In the era of digitalization and industry 4.0, smartphones have made significant progress and these devices are establishing as ideal solutions, thanks to their technical characteristics, costs and portability, compared to other acquisition techniques. The study is aimed at experimenting with image-based methodologies with the use of low-cost sensors where the three-dimensional models will constitute the basic element on which, through augmented reality applications, it will be possible to implement strategies aimed at documentation, conservation and monitoring. The experiment, reported therein, was conducted on the facade of the Quadriportico of the Cathedral of San Matteo in Salerno, Italy.