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Optical Engineering

Phase error correction by π-shift odd-step fringe projection and speckle filtering in phase measuring profilometry
Author(s): Shuang-Qing Wu; San-Yuan Zhang; Yin Zhang; Xiu-Zi Ye
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Paper 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.

Paper Details

Date Published: 1 April 2010
PDF: 6 pages
Opt. Eng. 49(4) 043603 doi: 10.1117/1.3407430
Published in: Optical Engineering Volume 49, Issue 4
Show Author Affiliations
Shuang-Qing Wu, Zhejiang Univ. (China)
San-Yuan Zhang, Zhejiang Univ. (China)
Yin Zhang, Zhejiang Univ. (China)
Xiu-Zi Ye, Zhejiang Univ. (China)

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