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- W4387449710 abstract "Direct digital impressions can be obtained using intraoral three-dimensional (3D) scanners. Among them, the fringe projection profilometry (FPP)-based intraoral scanner serves as a micro-3D imaging system. Here, proper calibration is critical for highly accurate digital impressions. However, due to its miniaturized structure, some of the designed geometric parameters are difficult to be attained in factory assembly using model-based reconstruction. Moreover, the angle of the structured light is typically small to avoid shadows of the dental sulcus. Consequently, even a small error in detecting stripe feature within the FPP image is magnified in the reconstructed 3D point. Thus, it is challenging to achieve proper calibration and meet the accuracy requirements of an intraoral 3D scanner. In this study, we introduce a consummated calibration model, by importing all the geometric parameters to compensate for assembly errors. A subpixel cross-center detection algorithm is proposed to prepare the data pairs for optimization of parameters in the calibration model. All parameters are optimized using the Levenberg–Marquardt algorithm. A 3D look-up table is used to refine the reconstructed 3D points. Excellent calibration results were achieved, demonstrating a precision of 15 μm for 3D teeth impression." @default.
- W4387449710 created "2023-10-10" @default.
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- W4387449710 date "2023-01-01" @default.
- W4387449710 modified "2023-10-11" @default.
- W4387449710 title "Calibration of Intraoral 3D Measurement System with Using Consummated Model Combined with Highly Accurate Data Pairs" @default.
- W4387449710 doi "https://doi.org/10.1109/tim.2023.3323007" @default.
- W4387449710 hasPublicationYear "2023" @default.
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