Abstract
Abstract. Metric documentation of buildings requires the connection of different spaces, such as rooms, corridors, floors, and interior and exterior spaces. Images and laser scans have to be oriented and registered to obtain accurate metric data about different areas and the related metric information (e.g., wall thickness). A robust registration can be obtained with total station measurements, especially when a geodetic network with multiple intersections on different station points is available. In the case of a photogrammetric project with several images acquired with a central perspective camera, the lack of total station measurements (i.e., control and check points) could result in a weak orientation for the limited overlap between images acquired through doors and windows. The procedure presented in this paper is based on 360° images acquired with an affordable digital camera (less than 350$). The large field of view of 360° images allows one to simultaneously capture different rooms as well as indoor and outdoor spaces, which will be visible in just a picture. This could provide a more robust orientation of multiple images acquired through narrow spaces. A combined bundle block adjustment that integrates central perspective and spherical images is here proposed and discussed. Additional considerations on the integration of fisheye images are discussed as well.
Highlights
Most projects in the field of architecture and engineering require the connection between different rooms, different floors, and interior and exterior spaces
The approach becomes similar to the traditional work carried out with a total station placed inside a room, measuring control points on the different walls to register photogrammetric projects in a single reference system
The combined use of a central perspective camera and 360° images allows the user to connect those rooms through doors and windows
Summary
Most projects in the field of architecture and engineering require the connection between different rooms, different floors, and interior and exterior spaces. Two doors do not allow a robust connection based only on the acquired central perspective images, making two or more station points necessary to join the photogrammetric projects with some control points. The idea is to obtain a metric reconstruction from two independent sets of central perspective images, that are connected in a single inside-outside project through 360° images. The method limits the use of total stations for connecting the various projects so that a single photogrammetric project can be created for rooms, corridors, indoor and outdoor spaces. The idea is to process sequences and blocks of central perspective images, using the 360° images as a link between different rooms. The approach becomes similar to the traditional work carried out with a total station placed inside a room, measuring control points on the different walls to register photogrammetric projects in a single reference system. The error cannot be neglected for real applications requiring detailed photogrammetric survey, making the method still not completely mature for producing accurate deliverables
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