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Your search keyword '"Qian, Kemao"' showing total 23 results
Start Over Author "Qian, Kemao" Publisher spie - international society of optical engineering
23 results on '"Qian, Kemao"'

4. Sampling moiré as a special windowed Fourier ridges algorithm in demodulation of carrier fringe patterns.

Author

Qian Kemao, Agarwal, Nimisha, Shien Ri, and Qinghua Wang

Subjects
*FOURIER analysis, *COMPUTER algorithms
Abstract

In recent times, both the windowed Fourier ridges (WFR) and sampling moiré (SM) algorithms have been extensively used due to their high effectiveness in the demodulation of carrier fringe patterns. As they are developed independently, they are mostly recognized as completely different techniques, but we theoretically prove that SM is a special WFR with a specific window shape and a preset local frequency. This unifies the two different algorithms and enhances the understanding of their theoretical aspects, which helps to simplify the selection of these algorithms in real applications. [ABSTRACT FROM AUTHOR]

Published
2018
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5. Windowed Fourier ridges as a spatial carrier phase-shifting algorithm.

Author

Agarwal, Nimisha and Qian Kemao

Subjects
*DIFFRACTION patterns, *FOURIER transforms, *PHASE estimation (Electronics)
Abstract

The windowed Fourier ridges (WFR) algorithm is shown to be a phase-shifting algorithm for phase extraction from a carrier fringe pattern. However, the former only provides a phase estimation with a controllable phase error, whereas the latter pursues exact phase extraction. This link not only is interesting but also enhances the understanding of different phase extraction techniques. Advantages and disadvantages of the WFRs algorithm are discussed. [ABSTRACT FROM AUTHOR]

Published
2017
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