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3D reconstruction from multiple images is the creation of three-dimensional models from a set of images. It is the reverse process of obtaining 2D images from 3D scenes. The essence of an image is a projection from a 3D scene onto a 2D plane, during which process the depth is lost.
2D digital image acquisition is the information source of 3D reconstruction. Commonly used 3D reconstruction is based on two or more images, although it may employ only one image in some cases. There are various types of methods for image acquisition that depends on the occasions and purposes of the specific application.
In computer vision, triangulation refers to the process of determining a point in 3D space given its projections onto two, or more, images. In order to solve this problem it is necessary to know the parameters of the camera projection function from 3D to 2D for the cameras involved, in the simplest case represented by the camera matrices .
Computer stereo vision is the extraction of 3D information from digital images, such as those obtained by a CCD camera.By comparing information about a scene from two vantage points, 3D information can be extracted by examining the relative positions of objects in the two panels.
In both instances, the correspondence between images and the reconstruction of 3D object needs to be found. To find correspondence between images, features such as corner points (edges with gradients in multiple directions) are tracked from one image to the next.
Images taken from multiple perspectives such as a fixed camera array can be taken of a subject for a photogrammetric reconstruction pipeline to generate a 3D mesh or point cloud. Photogrammetry provides reliable information about 3D shapes of physical objects based on analysis of photographic images.
Given 3D point = (,,) with world coordinates in a reference frame (,,), observed from different views, the inverse depth parametrization of is given by: = (,,,,,) where the first five components encode the camera pose in the first observation of the point, being = (,,) the optical centre, the azimuth, the elevation angle, and = ‖ ‖ the inverse depth of at the first observation.
The multiple-camera setup, multiple-camera mode of production, multi-camera or simply multicam is a method of filmmaking, ... 3D reconstruction from multiple images;
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