Spatial random access to explore heritage site using spherical video
Résumé
Spherical images are particularly adapted to develop virtual tours of heritage monuments. While Lidar scanning, photogrammetry and rotating camera systems can lead to produce spherical images, compact dual-fisheye cameras are accurate enough for many uses, such as virtual tour, and easy to use by a non-expert. But the classical software consider placing a few images manually on the blueprint of the environment. Then, the user navigation in the virtual monument is limited to generated transitions between a few locations. Instead of a few pictures, this paper considers a spherical video recorded while walking within a monument and illustrates how to explore spatial dimensions of the environment where the video was taken, beyond the time scroll-bar. To this end, spherical visual Simultaneous Localization And Mapping (SLAM) and the alignment of the resulting map to an architectural blueprint are combined to create a spatio-temporal virtual tour from a video. The concept is demonstrated on the al-Qarawiyyin Mosque in Fez, Morocco, with access to the virtual tour interface online to happen on https://mis.u-picardie.fr/~ecathedrale.
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