Patent ID: 6937959

Claim:
A method of determining a distance of a projection point of a first imaging beam of an imaging device from a measuring point of a measuring device on a surface of a printing form, both the projection point of the first imaging beam and the measuring point of the measuring device being movable in relation to the surface of the printing form and positions of the imaging beam and the measuring point on the surface of the printing form being determinable in relation to a fixed point, comprising the steps of: imaging a part of a first pattern using the first imaging beam as a function of the position of the imaging beam on the printing form in at least one direction spanning the surface of the printing form; measuring reflected intensity of at least a part of light illuminating the first pattern as a function of the position of the measuring device; and forming a difference of the at least one position of the measuring device and a correlated position of the first imaging beam where the first imaging beam was located as the part of the first pattern was imaged.