9 April 2020 Compensation of gamma effect and color cross talk in color-coded fringe profilometry
Yee Cong Kai, Kin Sam Yen
Author Affiliations +
Abstract

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.

© 2020 SPIE and IS&T 1017-9909/2020/$28.00 © 2020 SPIE and IS&T
Yee Cong Kai and Kin Sam Yen "Compensation of gamma effect and color cross talk in color-coded fringe profilometry," Journal of Electronic Imaging 29(2), 023021 (9 April 2020). https://doi.org/10.1117/1.JEI.29.2.023021
Received: 31 July 2019; Accepted: 30 March 2020; Published: 9 April 2020
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CITATIONS
Cited by 1 scholarly publication.
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KEYWORDS
Fringe analysis

Calibration

Cameras

RGB color model

Error analysis

Projection systems

Image processing

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