Dental 3D Camera Shake Index for Triangulation Scanning
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Solution Overview
Problem
Existing methods for optical scanning of three-dimensional objects using dental 3D cameras with the triangulation method face challenges in minimizing camera shake, which affects the quality of the scans, particularly in handheld applications where user experience is required to assess and mitigate camera shake artifacts.
Innovation Solution
A method and device that utilize a camera shake analyzing unit to compute a camera shake index from comparative signals derived from multiple images of a pattern projected on the object, allowing for real-time detection and objective assessment of camera stability, enabling the selection of optimal exposure moments and reducing the need for user expertise in monitoring and correcting for camera movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a handheld 3D camera is used for optical scanning, then mobility and ease of operation are improved, but camera shake artifacts increase and measurement precision deteriorates
Solution Approach 1:
The system performs preliminary actions by continuously capturing images and computing camera shake indices before the actual scanning exposure. Multiple preview images are recorded and analyzed to predict and compensate for camera shake, allowing the system to prepare correction data in advance of the critical measurement moment.
Solution Approach 2:
The system implements feedback by continuously monitoring camera shake through real-time image analysis and computing shake indices. This feedback loop allows the system to detect camera movement, quantify it through comparative signal analysis, and use this information to either trigger scans during stable periods or compensate for the detected shake in the final 3D reconstruction.
2Manufacturing precision
If multiple exposures are required for phase shifting method, then manufacturing precision is improved, but duration of action increases and productivity decreases
Solution Approach 1:
The system performs preliminary capture of multiple phase-shifted images and computes camera shake indices for each exposure before the final 3D reconstruction. This preliminary processing allows the system to have all necessary data ready, enabling faster reconstruction once the scanning is complete, thus improving overall productivity without sacrificing precision.
Solution Approach 2:
The system maintains continuous useful action by overlapping the camera shake analysis and image capture processes. While multiple exposures are being taken for the phase shifting method, the camera shake index is being computed continuously in the background, eliminating idle time between exposures and maximizing the utilization of the imaging system throughout the scanning duration.
3Measurement precision
If user experience is required to assess camera shake, then measurement precision can be maintained, but ease of operation deteriorates and device complexity increases
Solution Approach 1:
The system performs self-service by automatically computing camera shake indices from the captured images without requiring user intervention or expertise. The comparative signal analysis and shake index computation are automated processes that objectively assess camera stability and use this information to guide the scanning process, replacing subjective user judgment with automated computational analysis.
4Measurement precision
If camera shake is minimized by user control, then measurement precision is improved, but ease of operation deteriorates due to increased operational complexity
Solution Approach 1:
The system provides automated feedback by computing camera shake indices and using this information to objectively determine when to trigger scans. This feedback mechanism replaces manual user assessment with automated analysis, maintaining measurement precision through objective shake detection while improving ease of operation by eliminating the need for users to manually monitor and judge camera stability.
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
The solution significantly simplifies the scanning process by objectively assessing camera shake, ensuring high-quality 3D data sets are obtained with minimal artifacts, allowing for continuous recording and automatic initiation of scans when camera stability meets a threshold, thereby reducing the complexity of handling camera shake in dental 3D scanning.
Implementation Method 1
Method and device for optical scanning of three-dimensional objects by means of a dental 3D camera using a triangulation method
Data Source
AI summary
A dental 3D camera for optically scanning a three-dimensional object, and a method for operating a dental 3D camera. The camera operates in accordance with a triangulation procedure to acquire a plurality of images of the object. The method comprises forming at least one comparative signal based on at least two images of the object acquired by the camera while at least one pattern is projected on the object, and determining at least one camera shake index based on the at least one comparative signal.