Patent attributes
A method for optically scanning and measuring an environment by means of a hand-held scanner for producing 3D-scans is provided. The method including providing a hand-held scanner having at least one projector and at least one camera. At least one pattern is projected onto an object in the environment with the at least one projector. At least one camera images of the object which has the pattern projected thereon is recorded with a plurality of frames. Three-dimensional coordinates of points on the surface of the object are determined from each frame in the plurality of frames. A ring closure is determined in the plurality of frames. The determination comprising the steps of forming a frustum for each frame, comparing a last frustum of the last frame with a plurality of frusta to form an intersection, and selecting a frustum having the largest intersection.
