A method for measuring the 3D surface of an object, in particular for dental purposes

A method for measuring the 3D surface of an object by means of optical double triangulation using the phase shift method, in particular for dental purposes, a. wherein at least two 3D measurements of the same object (1) with different Triangluationswinkeln (θ1, θ2) are performed, which for each triangulation angle (θ1, θ2) having at least a phase image (φ1 (x, y), φ2 (x, y)) a plurality of pixels (B b. wherein the first triangulation angle (θ1) is known and the second triangulation angle (θ2) is approximately known, at least, c. wherein each phase image (φ1 (x, y), φ2 (x, y)) a from the triangulation angle (θ1, θ2) dependent unambiguity range (E1, E2), and wherein each phase image (φ1 (x, y), φ2 (x, y)) at least within the corresponding unambiguity area (E1, E2) by a scaling factor (S1, S2) can be imaged on metric height data, characterized, in that d. for each image point (B