ABSTRACT
Three-dimensional vision concerns itself with a system that captures three-dimensional displacement information from the surface of an object. Three-dimensional vision determines displacements along three co-ordinate axes. The systems use geometrical relationships to calculate the location of a large number of points, simultaneously. Three-dimensional vision systems are computationally intensive. When the operator is a computer, the measuring device would be a co-ordinate measuring machine (CMM). A CMM is a rectangular robot that uses a probe to acquire three-dimensional positional data. Vision systems that operate with a single camera are two-dimensional vision systems. Three-dimensional information may sometimes be inferred from such a vision system. Passive stereo vision is interesting because of its similarity to human vision, but it is rarely used by industry. Elements of passive stereo can be found in photogrammetry.
