公开(公告)号：US10531072B2

公开(公告)日：2020-01-07

申请号：US14440478

申请日：2013-11-04

Applicant: DENTSPLY SIRONA, Inc.

Inventor： Bjorn Popilka ,  Frank Thiel ,  Frank Forster

IPC: H04N13/246 ,  A61B5/107 ,  G01B11/25 ,  G01B21/04 ,  A61B5/00 ,  G06T7/80 ,  G06T7/521 ,  H04N17/00 ,  A61C9/00

Abstract: The invention relates to a method and a calibration device for calibrating a dental camera (1), which is based on a fringe projection method for optically measuring a dental object (10) in three dimensions, comprising a projection grid (2) for generating a projection pattern (3) that consists of a plurality of fringes (5), and an optical system (4) that projects the generated projection pattern (3) onto the object (10) to be measured. In a first step, a reference surface (74) with known dimensions is measured by the dental camera (1) using the fringe projection method. Actual coordinates (33, 36) of a plurality of measurement points (11) are determined on the reference surface (74), and the determined actual coordinates (33, 36) are compared to target coordinates (34) of the measurement points (11) on the reference surface (74). In the following method step, proceeding from the deviations (35, 37) between the actual coordinates (33, 36) and the target coordinates (34), a plurality of compensation values (40, 50, 51, 52, 53) are calculated for the individual fringes (5) of the projection pattern (3).