Handheld OCT 3D Imaging Feedback for Stitching Accuracy
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Solution Overview
Problem
Handheld 3D scanning devices face challenges in efficiently and accurately capturing three-dimensional views due to the lack of guidance on optimal positioning, leading to increased computing time and inaccurate results in the stitching process.
Innovation Solution
A method and system that provide real-time feedback to users by estimating the location metric of a second two-dimensional image relative to a first image, generating instructions on adequate positioning for capturing a second three-dimensional view, and using a feedback unit to inform the user, independent of stitching algorithms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple scans from many different directions are conducted to produce a complete 3D model, then the completeness of the 3D reconstruction is improved, but the computing time required increases considerably
Solution Approach 1:
The system provides real-time feedback to the user during the scanning process by displaying the current field of view and guiding the user to capture additional views that will contribute to a complete 3D model. This feedback mechanism helps users make informed decisions about where to position the device for the next scan, reducing unnecessary scans and optimizing the stitching process efficiency.
Solution Approach 2:
The system performs preliminary processing by capturing and storing two-dimensional images and their corresponding field of view information during the scanning process. This preliminary action prepares the data in advance for the stitching algorithm, allowing for more efficient processing and reducing the computational burden during the final 3D reconstruction phase.
2Ease of operation
If scans are captured from random orientations or positions, then the ease of operation is improved, but the stitching process becomes less accurate due to lack of proper overlap
Solution Approach 1:
The system displays the current field of view on a screen and provides visual feedback to the user about the device's position and orientation relative to the object being scanned. This feedback enables users to make informed decisions about positioning, ensuring that successive scans have adequate overlap for accurate stitching while maintaining the freedom of handheld operation.
Solution Approach 2:
The system uses an intermediary processing step that captures two-dimensional images and extracts information about the field of view and device position. This intermediary data serves as a bridge between the random handheld scanning movements and the structured requirements of the stitching algorithm, enabling accurate 3D reconstruction even when scans are taken from varied orientations.
Data Source
AI summary
A method for three-dimensional imaging stores a first image of field of view from a handheld optical coherence tomography (OCT) scanning device at a first position where a first OCT scan of an object is captured with the scanning device freely operated by a user. A location metric of a second image of field of view of the scanning device is estimated at a second position relative to the first image while the scanning device is moved from the first to the second position. Instructions on providing user feedback are generated based on the location metric. Feedback is provided to indicate if the second position is adequate for a second OCT scan, wherein providing feedback includes providing user perceivable light of a first color to indicate that the second position is adequate and providing user perceivable light of a second color to indicate that the second position is not adequate.