Intraoral Scanner External Light Interference Removal
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Solution Overview
Problem
Conventional three-dimensional scanning technologies for oral cavities face challenges in obtaining precise data due to external light interference, which affects the accuracy of scans and the production of prosthetic therapeutic products.
Innovation Solution
A method is introduced to remove external light interference by obtaining color and brightness information, correcting color values based on brightness information, and generating notification signals when external light exceeds certain thresholds, ensuring precise scan data is obtained by minimizing the influence of external light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If scanning is performed in a normal environment with external light sources, then the scanning process can be conducted with high degree of freedom and ease of operation, but the scan data accuracy deteriorates due to external light interference affecting color information
Solution Approach 1:
The patent converts the harmful external light interference into a useful signal by capturing brightness information from external light sources and using it to correct color information in scan data. The system deliberately captures images with external light present, extracts brightness values, and applies these to correct color distortions, thereby transforming the previously harmful external light into a beneficial correction reference.
Solution Approach 2:
The patent changes the parameter representation by separating color information into two components: brightness (intensity) and color tone (hue/saturation). By extracting brightness information as a separate parameter and using it to correct the color information, the system maintains scanning flexibility while improving data accuracy through parameter transformation and correction.
2Measurement precision
If multiple scans are performed to ensure data accuracy, then measurement precision improves, but productivity decreases due to increased time consumption and need for re-scans
Solution Approach 1:
The patent performs preliminary action by capturing a reference image of the scan target under external light conditions before or during the main scanning process. This reference image containing brightness information is prepared in advance and used to correct color information in the scan data, thereby preventing accuracy issues before they occur and eliminating the need for re-scanning.
Solution Approach 2:
The patent implements feedback by using captured brightness information from external light as a correction reference that is applied to the scan data processing. The system continuously references the externally captured brightness data during color correction, providing real-time feedback that ensures accuracy without requiring multiple scanning passes.
3Measurement precision
If external light is blocked or controlled during scanning, then measurement precision improves by eliminating light interference, but device complexity increases and ease of operation deteriorates
Solution Approach 1:
The patent extracts brightness information as a separate, independent parameter from the scan data by capturing a reference image under external light conditions. Instead of trying to control or eliminate external light, the system extracts the useful brightness component and separates it from the color information, thereby improving accuracy without adding light control complexity.
Solution Approach 2:
The patent introduces an intermediary element - a reference image captured under external light conditions - that mediates between the external light environment and the scan data processing. This intermediary reference image serves as a bridge, allowing the system to utilize external light information for correction without requiring direct control over the external light sources or complex light blocking mechanisms.
Data Source
AI summary
A method for removing external light interference according to the present disclosure includes: performing the scan in the state where external light is turned on, performing the scan in the state where the external light and internal light are turned on together, and calculating a brightness value from an obtained image. Further, by subtracting the brightness value obtained in the brightness calculating step from a color value of the image through an operation, it is possible to obtain an image and a three-dimensional scan model with the influence of the external light being minimized.