Patent ID: 6873721

Claim:
A method for operating a camera to determine a structure of machining marks on a surface of a cylindrically finely finished workpiece, the camera and the workpiece being mutually aligned, the method comprising the steps of: recording an image of surface characteristics of the workpiece; and in order to determine a helically running structure of the machining marks, performing the steps of: performing a Radon transformation of the image, and determining a helix angle of those of the machining marks that are helical; rotating the workpiece; recording a plurality of images if the surface characteristics of the workpiece at a constant twisting angle; providing a plurality of Radon transforms by performing the Radon transformation for each one of the plurality of images; extracting a Radon strip from each one of the plurality of Radon transforms; juxtaposing the Radon strips of the Radon transforms of each one of the plurality of images in a Radon strip image; and performing a correlation analysis of the juxtaposed Radon strips.