Correction of Nonlinear Digital Fringe Error for 3D Shape Measurement
Date Issued
2006
Date
2006
Author(s)
Huang, Wen-Zhao
DOI
zh-TW
Abstract
This thesis studies an error correction method to reduce nonlinear fringe errors induced by the LCD projector and digital cameras for measuring 3D shapes of objects. Firstly, an intensity look-up table is established for storing the difference between the assigned projected intensities and the measured intensities, and a phase error look-up table is also established for correcting the phase error induced by the intensity inconsistencies. Then, both intensity correction and phase error compensation are carried out for reconstruction of 3D object shapes, and the results between the uncorrected and corrected shapes are compared. It shows that the phase error compensation can effectively reduce the periodic fringe noise, and the intensity correction can improve the local splits on the reconstructed 3D shapes. Finally, by combining the advantages of the intensity correction and the phase error compensation, contrast-guided intensity correction and residual phase error compensation are proposed. 3D object shapes of several specimens with different colors and materials are measured. The results demonstrate that the proposed advanced error correction strategy offers good feasibility for improving the quality of reconstructed 3D shapes.
Subjects
數位條紋投射法
相位移法
相位重建
誤差校正
相位補償
三維外形量測
Digital fringe projection
Phase-shifting
Phase-unwrapping
Error correction
Phase error compensation
3D shape measurement
Type
thesis
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