Photogrammetry
Photogrammetry aims to capture measurements from various images of structures, objects, or landscapes. All in all, it encompasses the art, process, and science of measuring an image. All the points being measured should fall on the same plane. To create a 3D model of the subject, the plane must be rectified to eliminate distortion of any kind. The lower the amount of distortion, the more accurate the final measurements will be. The process as a whole, is based on line of sight and the principles of perspective. There are countless benefits of this process, it is non-invasive and provides important documentation which can be archived for later study.
(Title page image source: Josh Elmore Senior VFX Artist )
Structure from 3D Motion creates models from the rectified images. To do so, you must have at least one accurate measurement of the subject in study. Programs which preform such tasks include 123D Catch, and Atuodesk Recap Pro 360. These applications create a polygamal mesh model instead of a point cloud. It is vital for the overall accuracy of the model to insure all images are sized correctly. Further programs like MeshMixer can refine and clean up the 3D model.
