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US 7,742,635 B2Granted
Artifact mitigation in three-dimensional imaging
Assignee3M Innovative Properties Company
InventorsJanos Rohaly, Douglas P. Hart, Tong Zhang
Life of this patent
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Abstract
Accuracy of a three-dimensional imaging system is improved through the use of model-based calibration and lookup tables to resolve distance according to, e.g., x-displacement, y-displacement, or image disparity data. In an embodiment, the lookup table(s) stores localized parameterization data used to calculate calibrated results.
Claims2
A method for refining calibration of an imaging system comprising:
- acquiring image data with the imaging system from a measurement volume that includes a three-dimensional object having one or more known parameters;
- identifying a first projection contour of the three-dimensional object in the image data;
- analytically determining a second projection contour of the three-dimensional object using the one or more known parameters and a model of the imaging system;
- refining a calibration of the imaging system by minimizing a deviation between the first projection contour and the second projection contour;
- and
- storing the calibration in the imaging system for use in recovering calibrated coordinates during a three-dimensional scan.
3 more elements
Dependencies are inferred from the claim text.