3-D scanner calibration with active display target device
View Patent ↗Exemplary method and apparatus embodiments according to the applications can provide calibration of a dental scanning device. An exemplary dental apparatus can include a sensing apparatus including at least one lens and a sensor that is configured to obtain one or more images of at least one surface position, and a calibration target including a spatial light modulator configured to form a prescribed set of calibration patterns, and whose display plane corresponds to the at least one surface position.
1. A dental imaging apparatus for surface contour imaging of an object, the dental imaging apparatus comprising:
a calibration target comprising:
a spatial light modulator configured to form a prescribed set of calibration patterns that are displayed at display of the calibration target;
an intraoral apparatus for surface contour imaging of dentition comprising:
an illumination array configured to direct one or more illumination patterns toward the display of the calibration target; and
a sensor array including at least one lens and a sensor that is configured to obtain one or more images of the display of the calibration target;
where the sensor obtains at least one image of the prescribed set of calibration patterns displayed at the display of the calibration target, and where the sensor obtains at least one image of the illumination patterns reflected by the display of the calibration target, and
where illumination patterns are directed before or after the displaying of the prescribed set of calibration patterns, and
where the obtained images of the illumination patterns and calibration patterns by the sensor are decoded by a control logic processor coupled to the calibration target or the intraoral apparatus to determine a one-to-one correspondence between the image points on an illumination apparatus of the illumination array and points on the display of the calibration target to re-calibrate the sensor.