Use of photogrammetry
Photogrammetry is a processing process that involves using two-dimensional shots to extract a three-dimensional model.
The practical purposes of this science are widely seen in topographic mapping applications, in architecture, in engineering, in manufacturing, in quality control, in law enforcement investigations, in heritage and heritage preservation, in system of geographic information or in geology.
The basic principle of treatment in photogrammetry follows the following plan:
- Acquisition of shots (photos, LiDar point cloud, drone images or any aerial mobile).
- Organization of data according to properties
- Determination of the characteristics and similarities essential to the calculation
- Calculation of the sparse cloud.
- Determination of the dense cloud from step 4.
- Simplification of the dense model
- Determination of the 3D model by triangulation
- Refinement of the 3D model and recognition of regular shapes (by artificial intelligence, in some cases)
- Attempt to determine the equivalent model with light wire structure.
In general, computation can require significant resources in memory and in computing capacity (CPU or better GPU). A model can take these resources for a more or less slow time according to the capacity of the cloud (in general, dense obtained).
The software used is available in open source and in owners. There are, Meshroom, Visual SFM, COLMAP, Regard3D, Autodesk Recap, Zephyr, Metashape.