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Published on: December 3, 2013
Sequential demodulation of a single fringe pattern guided by local frequencies
1School of Computer Engineering, Nanyang Technological University, Singapore. mkmqian@ntu.edu.sg
Optics Letters
|December 23, 2006
Summary
This study introduces a simple method to accurately determine fringe pattern phase and local frequencies. It resolves sign ambiguity by ensuring continuity, successfully demodulating simulated and experimental fringe patterns.
Area of Science:
- Optics and Photonics
- Image Processing
Background:
- Fringe pattern analysis is crucial for optical metrology.
- Phase demodulation often suffers from sign ambiguity.
- Existing methods can be complex or computationally intensive.
Purpose of the Study:
- To propose a simple and effective fringe pattern demodulation approach.
- To address the sign ambiguity in phase and local frequency determination.
- To verify the method with simulated and experimental data.
Main Methods:
- Directly obtaining phase by arccosine of a preprocessed fringe pattern.
- Estimating local frequencies using local matching.
- Resolving sign ambiguity by enforcing continuity of local frequencies.
- Prioritizing sign determination based on fringe density.
Main Results:
- Successfully demodulated a simulated fringe pattern.
- Successfully demodulated two experimental fringe patterns.
- Demonstrated the effectiveness of the proposed sign ambiguity removal technique.
Conclusions:
- The proposed method offers a straightforward yet effective solution for single fringe pattern demodulation.
- Continuity of local frequencies is a reliable criterion for resolving sign ambiguity.
- The approach is robust for both synthetic and real-world fringe patterns.
