3-D scanner calibration with active display target device
Inventors
Assignees
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Publication Number
US-11484282-B2
Publication Date
2022-11-01
Expiration Date
Abstract
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.
Core Innovation
The invention relates to calibration of a dental imaging apparatus for surface contour imaging of dentition. A calibration target includes a spatial light modulator configured to form a prescribed set of calibration patterns displayed at the display of the calibration target, and the calibration target is used with a sensing arrangement that captures images of the displayed calibration patterns.
An intraoral apparatus includes an illumination array configured to direct one or more illumination patterns toward the display of the calibration target. The illumination patterns are directed before or after the displaying of the prescribed set of calibration patterns, so that images of both the calibration patterns and the illumination patterns reflected by the display of the calibration target are obtained.
The sensor array includes at least one lens and a sensor configured to obtain the one or more images. A control logic processor coupled to the calibration target or the intraoral apparatus decodes the obtained images of the illumination patterns and calibration patterns to determine a one-to-one correspondence between image points on an illumination apparatus of the illumination array and points on the display of the calibration target, to re-calibrate the sensor.
Claims Coverage
The independent claim defines a dental imaging apparatus that uses an active calibration target with a spatial light modulator and an intraoral illumination array. It includes five inventive features that together determine a one-to-one correspondence for re-calibration of the sensor.
Spatial light modulator displaying prescribed calibration patterns
A calibration target includes a spatial light modulator configured to form a prescribed set of calibration patterns displayed at the display of the calibration target.
Intraoral illumination array for directing illumination patterns toward the target display
An intraoral apparatus for surface contour imaging of dentition includes an illumination array configured to direct one or more illumination patterns toward the display of the calibration target.
Sensor array capturing images of calibration patterns and reflected illumination patterns
A sensor array including at least one lens and a sensor is configured to obtain images of the prescribed set of calibration patterns displayed at the display and images of the illumination patterns reflected by the display of the calibration target.
Timing flexibility between illumination patterns and calibration pattern display
The illumination patterns are directed before or after the displaying of the prescribed set of calibration patterns.
Decoding to determine one-to-one correspondence for sensor re-calibration
A control logic processor coupled to the calibration target or the intraoral apparatus decodes the obtained images of the illumination patterns and calibration patterns to determine a one-to-one correspondence between image points on an illumination apparatus of the illumination array and points on the display of the calibration target to re-calibrate the sensor.
The claim combines an active display calibration target, an intraoral illumination array, and a sensor array that captures both calibration-pattern images and reflected illumination-pattern images. A control logic processor decodes the captured images to determine a one-to-one correspondence between illumination-array image points and display points for sensor re-calibration.
Stated Advantages
Enables dense, high-accuracy pixel-to-world and image-to-world correspondences by decoding displayed codeword patterns captured by the sensor(s).
Allows programmable arbitrary calibration patterns via the spatial light modulator to reduce reliance on precision-manufactured fixed targets.
Documented Applications
Calibration of a dental imaging apparatus for surface contour imaging of dentition using an active display calibration target and an intraoral structured-light imaging arrangement.
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