A method is provided for determining the position of a structure within an image relative to a reference point, in which the structure has a center of symmetry, the method comprising: providing an image which comprises the structure and which has a reference point, carrying out at least one symmetry operation of the image with respect to the reference point, by means of which at least one mirror image is obtained which has a mirrored structure congruent relative to the structure, determining at least one displacement vector between a structure and a mirrored structure or two mirrored structures, and calculating the position of the structure as a position of the center of symmetry of the structure relative to the reference point from the at least one displacement vector. Furthermore, a position measuring device is provided for determining the position of a structure within an image relative to a reference point.