Phase error correction method based on the Gaussian filtering algorithm and intensity variance
Qian-qian Gu, Shan-shan Lü, Ming-shun Jiang, Lei Zhang, Fa-ye Zhang, Qing-mei Sui, Lei Jia
Optoelectronics Letters ›› 2021, Vol. 17 ›› Issue (4) : 221-225.
Phase error correction method based on the Gaussian filtering algorithm and intensity variance
To overcome the invalid phase and phase jump phenomenon generated during the phase unwrapping, a phase error correction method based on the Gaussian filtering algorithm and intensity variance is proposed in this paper. First, a threshold of fringe intensity variance is set to identify and clear the phase in the invalid region. Then, the Gaussian filtering algorithm is employed to correct the phase order at the fringe junction, and then the absolute phase is corrected. Finally, the phase correction experiments of different geometric objects are carried out to verify the feasibility and accuracy of the proposed method. The method proposed in this paper can be extended to the correction of absolute phase error obtained by any coding method.
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Wang Minmin, Research on Phase Extraction Algorithm for 3-D shape Measurement, Shandong University, 2018. (in Chinese)
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