Intraoral Scan Post Positioning for Accurate 3D Stitching
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Solution Overview
Problem
The use of multi-data stitching solutions in intraoral scanning leads to cumulative errors, resulting in low overall accuracy of dental models during tooth restoration procedures.
Innovation Solution
A method and apparatus for processing scanning data that involves installing intraoral scan posts with auxiliary feature points, using a single-lens reflex photogrammetry system to obtain true value coordinates, and performing data processing to determine a target position transformation relationship based on these points, ensuring accurate relative positioning of scan posts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multi-data stitching solution is used to expand scanning range, then scanning coverage is improved, but measurement precision deteriorates due to cumulative errors
Solution Approach 1:
The patent introduces scan posts with auxiliary feature points as intermediary reference objects between the scanner and the oral cavity. These scan posts provide known reference points that enable accurate transformation between different scanning segments, eliminating cumulative errors while maintaining expanded scanning coverage through multiple posts positioned throughout the oral cavity.
Solution Approach 2:
The patent transforms the coordinate system parameters by establishing a transformation relationship based on auxiliary feature points with known coordinates. By changing from direct stitching of oral cavity scans to transformation through reference frame (scan post) coordinates, the system maintains precision across multiple scanning areas without suffering from cumulative errors.
2Area of stationary object
If multiple scan posts are deployed to cover large oral cavity, then scanning range is improved, but device complexity increases
Solution Approach 1:
The scan posts serve multiple functions: they act as physical references for positioning, provide auxiliary feature points for image recognition, establish coordinate transformation relationships, and enable calibration between different scanning segments. This multi-functionality reduces the need for separate calibration procedures and simplifies the overall system despite using multiple posts.
Solution Approach 2:
The patent uses auxiliary feature points that can be digitally captured and processed as coordinate references. Instead of physically measuring and recording coordinates for each scan post, the system captures images of the feature points and extracts their coordinates through image processing, simplifying the deployment and calibration process while maintaining accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves data processing efficiency and accuracy in intraoral scanning by accurately locating the relative position between scan posts, enhancing the precision of dental prosthesis design and installation.
Implementation Method 1
using a single-lens reflex photogrammetry system to obtain true value coordinates
Data Source
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AI summary
Embodiments of the present disclosure relate to a method and apparatus for processing scanning data, a device, and a medium. The method includes: obtaining a plurality of frames of images to be processed including auxiliary feature points, where the auxiliary feature points have corresponding distribution true values; performing processing based on the plurality of frames of images to be processed to obtain all three-dimensional coordinate points in a same coordinate system in conjunction with a current camera pose; performing measurement processing on all the three-dimensional coordinate points to obtain target three-dimensional coordinate points; and determining a target position transformation relationship based on the target three-dimensional coordinate points and the distribution true values. By adopting the above technical solution, the target position transformation relationship is determined based on the distribution true values preset for the auxiliary feature points and the three-dimensional coordinate points calculated through scanning, such that a relative position between scan posts can be accurately located, and the data processing efficiency and accuracy in an intraoral scanning scenario are improved.