The most common class of 3D surface imaging system is based on digital stereophotogrammetric technology. These systems are capable of accurately reproducing the surface geometry of the face, and map realistic color and texture data onto the geometric shape resulting in a lifelike rendering (Fig. ​ 1).

How does stereophotogrammetry work?

Stereophotogrammetry involves estimating the 3D coordinates of points on an object (the face, in our case), employing measurements made in two or more photographic images taken from different positions. The image is calculated from a collection of points obtained along an x, y, and z coordinate system.

What is stereo model in photogrammetry?

a three-dimensional impression of an object or sector of terrain received by an observer viewing two flat perspective images obtained from different points in space.