Patent ID: 9314150
Filing Date: 2016-04-19
CPC Classification: A61B,A61C,G01B,G03B,G06T

Claim Text:
1. A method for imaging the surface of a tooth comprising: a computer, at least in part, for executing the method; recording a first set of 2-D images of the tooth, wherein each image in the first set of images is illuminated according to a fringe pattern generator oriented in a first direction; recording a subsequent different second set of 2-D images of the tooth, wherein each image in the second set of images is illuminated according to a fringe pattern generator oriented in a second direction that is shifted more than 10 degrees with respect to the first direction; reconstructing a first 3-D contour image according to the recorded first set of images and a second 3-D contour image according to the recorded second set of images; forming a 3-D residual image as a subtraction operation between the first and second 3-D contour images; and analyzing the 3-D residual image; detecting a crack on the tooth by applying a line model algorithm; and displaying surface conditions of the tooth.