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Absolute phase retrieval for colored objects based on three phase-shifting amount codes
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DOI：10.1364/OE.409324.png)
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Abstract
En 中文
We propose an absolute phase retrieval method based on three phase-shifting amount codes (3-PSA-codes) to measure the colored object with one additional pattern. 3-PSA-codes adopt the coding concept of 3-digit-codes, in which the code elements of three consecutive periods are treated as a unique code word for one period. However, to measure the colored object more effectively in the proposed method, each code element is embedded into the PSA domain and retrieved from the phase difference. Fringe patterns for the wrapped phase are artfully employed in the code element retrieval. Hence, for the first time, to the best of our knowledge, the code element related to the phase can be determined by one additional pattern. It breaks the constraint that temporal methods require multiple additional patterns to overcome the adverse effect of the surface color of objects on absolute phase retrieval. Experimental results demonstrate that the proposed 3-PSA-codes have strong robustness in the measurement of the colored object. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Keywords:
3-DIMENSIONAL SHAPE MEASUREMENT
FRINGE PROJECTION PROFILOMETRY
GRAY-CODE
CODING METHOD
ILLUMINATION
PATTERN
SYSTEM