METHOD FOR THREE-DIMENSIONAL DIGITISATION

摘要

The invention relates to a method for building a synthetic image (2) of the three-dimensional surface (3) of a physical object (4), wherein said method comprises the following operations: selecting a surface (3) on the object; placing opposite said surface (3) a projector (8) having a light source (10), an optical axis (13) and a raster (12) defining a speckled pattern that comprises multiple points having predetermined light and/or colour intensities; orienting the optical axis (13) of the projector (8) towards the surface (3) to be digitised; projecting the speckled pattern along the optical axis (13) onto the surface (3); acquiring and storing a two-dimensional image of the speckled pattern (14') projected onto the surface (3) and deformed by the latter, using an optical sensor (17) arranged in the optical axis (13) of the projector (8); for at least one selection of points in the speckled pattern, comparing the image of the deformed speckled pattern (14') with an image of the non-deformed speckled pattern (14) as projected on a reference plane (F); for each point in the selection, calculating at least the depth co-ordinate (z), as measured parallel to the optical axis (13), of the projection of that point onto the surface (3), and of the projection of that point onto the object.