Phase error correction by π-shift odd-step fringe projection and speckle filtering in phase measuring profilometry

Shuang-Qing Wu; San-Yuan Zhang; Yin Zhang; Xiu-Zi Ye

doi:10.1117/1.3407430

1 April 2010 Phase error correction by π-shift odd-step fringe projection and speckle filtering in phase measuring profilometry

Shuang-Qing Wu, San-Yuan Zhang, Yin Zhang, Xiu-Zi Ye

Author Affiliations +

Optical Engineering, Vol. 49, Issue 4, 043603 (April 2010). https://doi.org/10.1117/1.3407430

Abstract

Phase measuring profilometry based on structured illumination with a digital projector has great flexibility. However, the phase error introduced by the gamma nonlinearity of the projector and the presence of speckle noise inevitably decreases the accuracy and resolution of the measurement. This paper presents a new phase error correction algorithm by which the odd-step fringe projection is done twice with an initial phase shift of π between, and the two captured deformed fringe images are then digitally subtracted. The speckle noise is further suppressed by applying a sine-cosine median filter. Both theoretical analysis and experimental results showed that this algorithm is effective and fast.

©(2010) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Shuang-Qing Wu, San-Yuan Zhang, Yin Zhang, and Xiu-Zi Ye "Phase error correction by π-shift odd-step fringe projection and speckle filtering in phase measuring profilometry," Optical Engineering 49(4), 043603 (1 April 2010). https://doi.org/10.1117/1.3407430

Published: 1 April 2010

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