Calibrated intraoral scanning system

A scanning system, comprising:

• an intraoral scanner, comprising:
• a means for emitting light, wherein the intraoral scanner is to transmit the light onto an object;
• and
• a means for forming a sequence of images of the object under a plurality of different conditions;
• and
• a computing device configured to perform a calibration of the intraoral scanner, wherein the computing device comprises:
• means for determining, from the sequence of images, differences in measured coordinates for a plurality of points on the object under the plurality of different conditions;
• means for generating or updating one or more compensation models that compensate for inaccuracies of the intraoral scanner based at least in part on the differences in the measured coordinates for the plurality of points of the object between the plurality of different conditions;
• and
• means for storing the one or more compensation models, wherein the one or more compensation models cause the intraoral scanner to be a calibrated intraoral scanner and are usable to correct measurement errors of the intraoral scanner caused by the inaccuracies of the intraoral scanner.

A scanning system, comprising:

• an intraoral scanner, comprising:
• a light source configured to emit light, wherein the intraoral scanner is configured to transmit the light onto an object;
• an image sensor comprising a plurality of sensor elements, wherein the image sensor is configured to receive returning light reflected off of the object to generate measurement data;
• and
• an optical system having at least one of a non-fixed magnification or a non-flat focal surface, wherein at least one of the light or the returning light passes through the optical system, and wherein at least one of the non-fixed magnification or the non-flat focal surface of the optical system causes inaccuracy in the measurement data;
• and
• one or more processor to:
• determine coordinates of a plurality of surface points of the object based on the measurement data, wherein the coordinates for at least a subset of the plurality of surface points comprise inaccuracies caused by at least one of the non-fixed magnification or the non-flat focal surface;
• adjust the coordinates of the subset of the plurality of surface points along up to three axes to correct the measurement data so as to remove the inaccuracies caused by at least one of the non-fixed magnification or the non-flat focal surface;
• and
• generate a three dimensional model of the object using the adjusted coordinates in which the inaccuracies caused by at least one of the non-fixed magnification or the non-flat focal surface have been removed.