×

Method and device for determining an angled structure in the surface of a precision machined cylindrical work piece

  • US 6,873,721 B1
  • Filed: 03/05/1999
  • Issued: 03/29/2005
  • Est. Priority Date: 03/09/1998
  • Status: Expired due to Fees
First Claim
Patent Images

1. 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.

View all claims
  • 4 Assignments
Timeline View
Assignment View
    ×
    ×