Fringe-pattern demodulation using an iterative linear digital phase locked loop algorithm
| Autor: | Munther A. Gdeisat, David R. Burton, Michael J. Lalor |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Iterative method
Computer science Mechanical Engineering ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION Astrophysics::Instrumentation and Methods for Astrophysics Phase (waves) Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Phase-locked loop Moving average DPLL algorithm Demodulation Profilometer Electrical and Electronic Engineering Algorithm Smoothing |
| Zdroj: | Optics and Lasers in Engineering. 43:767-775 |
| ISSN: | 0143-8166 |
| DOI: | 10.1016/j.optlaseng.2004.08.006 |
| Popis: | A novel technique called an iterative linear digital phase locked loop (DPLL) for fringe-pattern demodulation is presented. The proposed technique has better noise immunity than the basic one-dimensional DPLL algorithms (e.g., conventional and linear DPLLs) because it processes a fringe pattern in two dimensions. In the first iteration of the proposed algorithm, it uses a flat reference to estimate the phase of the fringe pattern. The estimated phase map resulting from the first iteration is smoothed using a moving average window and then it is used as a reference to estimate the phase of the fringe pattern in the second iteration. In the third iteration, the phase map resulting from the second iteration is smoothed and used as a reference to estimate the phase of the fringe pattern in the fourth iteration and so on until the demodulated phase map has a good signal-to-noise ratio. |
| Databáze: | OpenAIRE |
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