1. A computer-implemented method for designing a 3D modeled object representing a real object, comprising the steps of: providing a 3D representation of the real object; identifying occurrences of a geometric feature at 3D positions of the 3D representation; providing at least one 2D view of the real object; identifying occurrences of a graphic feature at 2D positions of the 2D view, the geometric feature corresponding to the graphic feature; and computing camera parameters that minimize a distance between a set of projections of the 3D positions on the 2D view and a set of 2D positions.