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Multi-subzone algorithm for absolute phase retrieval in digital fringe projection profilometry.

Y Xing, C Quan, C J Tay

|December 14, 2016

Summary

This summary is machine-generated.

This study introduces a novel multi-subzone coding and decoding algorithm to enhance absolute phase retrieval. The new method effectively identifies absolute fringe order, even with high-frequency fringes, improving measurements of complex surfaces.

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Area of Science:

Optical Metrology
Image Processing

Background:

Absolute phase retrieval techniques rely on codewords to determine fringe order.
Limited unique codewords restrict the use of high-frequency fringes in sinusoidal patterns.

Purpose of the Study:

To propose a multi-subzone coding and decoding algorithm to overcome codeword limitations in absolute phase retrieval.
To enable the measurement of objects with large step-height surface discontinuities.

Main Methods:

Developed three multi-subzone coding methods based on two-frequency, gray-code, and phase-coding.
Implemented a decoding strategy using non-unique codewords to identify absolute fringe order.
Utilized wrapped phase maps to estimate fringe order ranges.

Main Results:

The proposed algorithm successfully identifies absolute fringe order using multi-subzone coding.
Experimental results show advantages over existing coding methods for high-frequency fringe patterns.
The algorithm effectively measures objects with significant surface height variations.

Conclusions:

The multi-subzone coding and decoding algorithm enhances absolute phase retrieval capabilities.
This method expands the applicability of phase retrieval techniques to complex surfaces.
The algorithm offers a robust solution for precise surface discontinuity measurements.