Three=dimensional object surface reconstruction - determines coordinates from correspondence between sets of images grouped in pairs and uses optical illumination of points

摘要

The procedure involves successively illuminating zones (Z) to points on the surface to form images at two observation positions (101, 102). Each observation position has an objective lens (11, 112) with optical centre (01, 02) and optical axis (91, 92) and a photosensitive surface (121, 122). The illuminating source (S) lies on the line joining the optical centres (01, 02). The zones (Z) lie on curve at the body surface, each point of the curve belonging to a different plane passing through the optical centres. A correspondence is established between the point images (Y1, Y2) in the zone images (y1, Y2) at each observation position, which verifies the relation existing between the two pairs of coordinates associated with each of the point images corresponding to the same point object. The three-dimensional coordinates of the point objects are determined and thus the form of the surface of the body may be established. The appts. has two cameras at the observation positions, a light source, and a computer for determining the correspondences between images and thus the three-dimensional coordinates.