A reconstruction system combines evidence from images, video or depth sensors to infer geometry that was not directly measured from one view. It must align camera positions and identify corresponding scene points across observations.
Long videos can provide many viewpoints but also introduce moving objects, changing light and accumulated alignment errors. A coherent result keeps the same structures connected and correctly placed throughout the recovered scene.
ELI5
3D reconstruction builds a three-dimensional representation from pictures, video or sensor measurements. It combines different views to estimate the shape and location of things in a scene.
For example, a long walk-through video can become a 3D model of a building. The system must recognize the same walls and objects across frames so the final geometry does not bend, duplicate or drift apart.
