Patents by Inventor Frank Behrend

Frank Behrend has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 7284858
    Abstract: The invention relates to a method for determining distances in the anterior ocular segment, preferably of the pupils and/or the diameter of the iris, wherein the image of at least part of the eye is recorded and digitized using an imaging device and an array for illuminating the eye. On the basis of said digital image, a center of gravity analysis and the determination of the central point are carried out, especially for the position of the pupils, by conducting an intensity and threshold analysis as rough determination. Based on said rough determination, a fine detection of the position of the edges of the pupil and/or the edges of the iris is carried out. Additionally, the angle between the visual axis and the optical axis of the eye can be determined from the position of a fixed reflection to the center of the pupil and/or the center of the iris.
    Type: Grant
    Filed: February 16, 2002
    Date of Patent: October 23, 2007
    Assignee: Carl Zeiss Meditec AG
    Inventors: Roland Bergner, Roland Barth, Axel Doering, Frank Behrend, Klaus-Ditmar Voigt
  • Publication number: 20040070728
    Abstract: The invention relates to a method for determining distances in the anterior ocular segment, preferably of the pupils and/or the diameter of the iris, wherein the image of at least part of the eye is recorded and digitized using an imaging device and an array for illuminating the eye. On the basis of said digital image, a center of gravity analysis and the determination of the central point are carried out, especially for the position of the pupils, by conducting an intensity and threshold analysis as rough determination. Based on said rough determination, a fine detection of the position of the edges of the pupil and/or the edges of the iris is carried out. Additionally, the angle between the visual axis and the optical axis of the eye can be determined from the position of a fixed reflection to the center of the pupil and/or the center of the iris.
    Type: Application
    Filed: August 18, 2003
    Publication date: April 15, 2004
    Inventors: Roland Bergner, Roland Barth, Axel Doering, Frank Behrend, Klaus-Ditmar Voigt