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A three-dimensional measurement method for colorful objects based on intensity pre-calibration

Abstract

Due to color object surface interference, the distortion of captured sinusoidal fringe patterns in a colorful object measurement using fringe projection profilometry causes significant phase error and therefore shape measurement error. To address the problem, an intensity correction method is proposed to correct the acquired nonsinusoidal fringe of color object and aim to improve three-dimensional (3D) reconstruction accuracy. In this paper, first, the look-up tables (LUTs) and multi-fusion matrices (MFM) are established; secondly, finding the optimal indexing value to correct the color fringe pattern for improving recognition rates and sine; finally, the corrected pattern is separated into three phase-shifting fringe patterns, which can obtain demodulation phase by the three-step phase-shifting algorithm and then recover unwrapping phase. The simulation and experimental results demonstrate that the proposed method effectively reduces the phase error of color objects and achieves complete measurement of different color regions.

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Data Availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

This work was supported in part by the National Key Research and Development Programs of China 2018YFC1603500, and the National Natural Science Foundation of China (NSFC) 61975161.

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Correspondence to Hong Zhao.

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Zhu, Q., Zhao, H. & Gong, Z. A three-dimensional measurement method for colorful objects based on intensity pre-calibration. Opt Rev 29, 343–353 (2022). https://doi.org/10.1007/s10043-022-00751-2

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  • DOI: https://doi.org/10.1007/s10043-022-00751-2

Keywords

  • Three-dimensional measurement
  • Fringe projection
  • Colorful object
  • Intensity correction