3D Scan Frame Alignment for Accurate Partial Dental Capture
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Solution Overview
Problem
Existing methods for obtaining three-dimensional data in dental CAD/CAM fail to accurately capture the shape of objects like teeth without distortion, particularly when focusing on specific regions, requiring full-scanning of the entire object.
Innovation Solution
A method involving obtaining three-dimensional reference data, aligning frames from specific object regions on this data, and merging them based on overlapping portions, using optical scanners and real-time alignment techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full scanning of the entire object is performed to obtain three-dimensional data, then complete coverage of all regions is achieved, but scanning time and operational complexity increase significantly
Solution Approach 1:
The patent divides the scanning process into multiple frames, where each frame captures a specific region of the object. The processor selectively processes only the frames containing the target region of interest, rather than processing all frames from a complete scan. This segmentation approach reduces processing time while maintaining accuracy for the specific region needed.
Solution Approach 2:
The patent extracts and processes only the relevant frames containing the region of interest from the complete set of scanned frames. By identifying and isolating the specific frames that contain the target area, the system eliminates unnecessary processing of other regions, thereby reducing overall scanning and processing time while preserving measurement precision for the area of interest.
2Loss of time
If frames from specific regions are selected and aligned on reference data, then scanning time is reduced, but alignment accuracy may deteriorate without proper reference data
Solution Approach 1:
The patent performs preliminary acquisition of three-dimensional reference data for the entire object before selecting and processing specific frames. This reference data serves as a foundation for accurate alignment of the selected frames. By having the reference data prepared in advance, the system can quickly align partial scans without sacrificing precision, resolving the contradiction between reduced scanning time and maintained alignment accuracy.
3Productivity
If only discontinuous regions are scanned instead of the entire object, then productivity increases, but data completeness and reliability decrease
Solution Approach 1:
The patent merges multiple selectively processed frames that contain the region of interest to reconstruct complete three-dimensional data for that specific area. By combining information from multiple frames rather than relying on a single scan, the system achieves both high productivity (by excluding irrelevant regions) and high reliability (through merged, verified data from multiple sources).
Solution Approach 2:
The system uses the three-dimensional reference data as feedback to verify and validate the selected frames. The processor compares the selected frames against the reference data to ensure accuracy and completeness, allowing the system to maintain high reliability even when scanning only discontinuous regions of interest.
Data Source
AI summary
A method of obtaining three-dimensional data includes: obtaining three-dimensional reference data with respect to an object; aligning, on the three-dimensional reference data, a first frame obtained by scanning a first region of the object; aligning, on the three-dimensional reference data, a second frame obtained by scanning a second region of the object, at least a portion of the second region overlapping the first region; and obtaining the three-dimensional data by merging the first frame with the second frame based on an overlapping portion between the first region and the second region.