Method for monitoring linear dimensions of three-dimensional objects

Abstract

A method of 3D measurement is performed using a first camera and a second camera located at different distances from the projector. The method includes projecting a known projection pattern that includes at least two non-crossing lines to form a first band and a second band on a surface of an object. The method includes recording first and second images of the object using the first and second cameras, respectively. The method includes determining a first longitudinal coordinate of a first point within the first band and a first vertical coordinate of the first point within the first band; determining a second longitudinal coordinate of the first point within the first band; and determining a second vertical coordinate of the first point within the first band. The method includes determining a final vertical coordinate of the first point by comparing the first longitudinal coordinate to the second longitudinal coordinate.