Selection of phase-recovery algorithms for fringe processing in optical measurement of micro-surface

Yongjian Zhu; Weiqing Pan; Anhu Li; Yanan Zhi

doi:10.1117/12.927783

13 September 2012 Selection of phase-recovery algorithms for fringe processing in optical measurement of micro-surface

Yongjian Zhu, Weiqing Pan, Anhu Li, Yanan Zhi

Proceedings Volume 8493, Interferometry XVI: Techniques and Analysis; 84931B (2012) https://doi.org/10.1117/12.927783
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

Abstract

Success of optical measurement methods such as interferometry, holography and fringe projection methods mainly depends on the availability of robust phase recovery (PR) algorithms. In presence of some problems such as strong noise, abrupt phase changes, low fringe contrast and discontinuities, it’s necessary to introduce a highly reliable algorithm to overcome them. As for the experimental phase map from holographic interferometry of China coin’s micro-surface, some typical PR algorithms including the proposed (weighted) DCT (Discrete Cosine Transform) are studied to try to recover the satisfactory continuous phase. The experimental phase map (13921040 pixels) exhibits the local surface characteristic of one China coin. It features excessive noise and many bad data points. It’s very difficult to achieve the continuous phase by the general algorithms. So some robust algorithms are studied to solve this problem. These algorithms include the quality map guided method (QG), (weighted) least square method (LS or WLS), mask cut method (MC) and (weight) DCT method (DCT or WDCT). According to the tested results, the fastest algorithm is the LS method, and it only needs about 10s. The clearest pattern profile results from the DCT and WDCT algorithms that need about 30s and 31s in the consuming time, respectively. However, it’s very hard to clearly and completely reflect the smooth top of imprinted letters for all the above algorithms. This could be due to the excessively much noise, the limited resolutions of CCD setup, and so on.

Citation Download Citation

Yongjian Zhu, Weiqing Pan, Anhu Li, and Yanan Zhi "Selection of phase-recovery algorithms for fringe processing in optical measurement of micro-surface", Proc. SPIE 8493, Interferometry XVI: Techniques and Analysis, 84931B (13 September 2012); https://doi.org/10.1117/12.927783

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