The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 07, 2020
Filed:
Nov. 04, 2013
Dentsply Sirona, Inc., York, PA (US);
DENTSPLY SIRONA INC., York, PA (US);
Abstract
The invention relates to a method and a calibration device for calibrating a dental camera (), which is based on a fringe projection method for optically measuring a dental object () in three dimensions, comprising a projection grid () for generating a projection pattern () that consists of a plurality of fringes (), and an optical system () that projects the generated projection pattern () onto the object () to be measured. In a first step, a reference surface () with known dimensions is measured by the dental camera () using the fringe projection method. Actual coordinates () of a plurality of measurement points () are determined on the reference surface (), and the determined actual coordinates () are compared to target coordinates () of the measurement points () on the reference surface (). In the following method step, proceeding from the deviations () between the actual coordinates () and the target coordinates (), a plurality of compensation values () are calculated for the individual fringes () of the projection pattern ().