Color-coded fringe pattern is usually used to speedup phase unwrapping in surface profilometry. However, color-coded fringe pattern is subject to phase errors due to gamma nonlinearity and color cross talk. The phase error is conventionally reduced by isolating the color channels and by compensating the phase error in each channel. In this work, a phase error feedback calibration algorithm is proposed to eliminate the phase errors in a single process. The percentage phase errors are reduced from 1.08 ± 2.32 % to 0.73 ± 0.46 % with 95% level of confidence after an average of eight iterations of the proposed algorithm. The 3D reconstruction of the objects is improved in terms of accuracy and surface smoothness after calibration. |
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CITATIONS
Cited by 1 scholarly publication.
Fringe analysis
Calibration
Cameras
RGB color model
Error analysis
Projection systems
Image processing