A method for generating a calibrated projection on a projection surface, with the steps: a) arranging and/or generating a calibrating structure following the spatial extension of the projection surface, which has a first side and a second side, which extends parallel to the first side, and has a constant height as measured in direction of the first or the second side (51, 52); b) generating an image of the calibrating structure in an image plane by means of a camera; c) reconstructing the spatial extension of the projection surface in the region of the calibrating structure, comprising the steps: d) determining a plurality of pairs of points (A-F) of the image of the calibrating structure, which each include a first point (A, C, E) and a second point (B, D, F) of the image of the calibrating structure, wherein the first and the second point each correspond to a first and a second point of the actual calibrating structure, which are located opposite to each other along the first or the second side (51, 52) of the calibrating structure; e) generating a plurality of auxiliary beam pairs which each include two auxiliary beams (81 a, 81b, 82a, 82b, 83a, 83b), which extend from the first and the second point (A-F) of the pairs of points to an imaginary vanishing point before the image plane; f) generating a plurality of supporting paths (71, 72, 73) parallel to each other, which each begin on one of the auxiliary beams (81 a, 82a, 83a) of one of the auxiliary beam pairs and end on the respective other auxiliary beam (81 b, 82b, 83b) of the auxiliary beam pair; g) varying the length and/or the orientation of the supporting paths (71, 72, 73), until all supporting paths (71, 72, 73) have the same length and each impinge on a common plane under the same angle; h) generating a model of the projection surface by using the supporting paths found according to step g), wherein these supporting paths are path sections of the sought projection surface, which extend parallel to the first and second side (51, 52) of the calibrating structure; i) generating a calibrated projection by using the model of the projection surface generated according to step h). a) arranging and/or generating a calibrating structure following the spatial extension of the projection surface, which has a first side and a second side, which extends parallel to the first side, and has a constant height as measured in direction of the first or the second side (51, 52); b) generating an image of the calibrating structure in an image plane by means of a camera; c) reconstructing the spatial extension of the projection surface in the region of the calibrating structure, comprising the steps: d) determining a plurality of pairs of points (A-F) of the image of the calibrating structure, which each include a first point (A, C, E) and a second point (B, D, F) of the image of the calibrating structure, wherein the first and the second point each correspond to a first and a second point of the actual calibrating structure, which are located opposite to each other along the first or the second side (51, 52) of the calibrating structure; e) generating a plurality of auxiliary beam pairs which each include two auxiliary beams (81 a, 81b, 82a, 82b, 83a, 83b), which extend from the first and the second point (A-F) of the pairs of points to an imaginary vanishing point before the image plane; f) generating a plurality of supporting paths (71, 72, 73) parallel to each other, which each begin on one of the auxiliary beams (81 a, 82a, 83a) of one of the auxiliary beam pairs and end on the respective other auxiliary beam (81 b, 82b, 83b) of the auxiliary beam pair; g) varying the length and/or the orientation of the supporting paths (71, 72, 73), until all supporting paths (71, 72, 73) have the same length and each impinge on a common plane under the same angle; h) generating a model of the projection surface by using the supporting paths found according to step g), wherein these supporting paths are path sections of the sought projection surface, which extend parallel to the first and second side (51, 52) of the calibrating structure; i) generating a calibrated projection by using the model of the projection surface generated according to step h).