Integration of robust filters and phase unwrapping algorithms for image reconstruction of objects containing height discontinuities

Optics Express
Jing-Feng Weng, Yu-Lung Lo

Abstract

For 3D objects with height discontinuities, the image reconstruction performance of interferometric systems is adversely affected by the presence of noise in the wrapped phase map. Various schemes have been proposed for detecting residual noise, speckle noise and noise at the lateral surfaces of the discontinuities. However, in most schemes, some noisy pixels are missed and noise detection errors occur. Accordingly, this paper proposes two robust filters (designated as Filters A and B, respectively) for improving the performance of the phase unwrapping process for objects with height discontinuities. Filter A comprises a noise and phase jump detection scheme and an adaptive median filter, while Filter B replaces the detected noise with the median phase value of an N × N mask centered on the noisy pixel. Filter A enables most of the noise and detection errors in the wrapped phase map to be removed. Filter B then detects and corrects any remaining noise or detection errors during the phase unwrapping process. Three reconstruction paths are proposed, Path I, Path II and Path III. Path I combines the path-dependent MACY algorithm with Filters A and B, while Paths II and III combine the path-independent cellular automata (CA) algori...Continue Reading

References

Dec 1, 1983·Applied Optics·W W Macy
Apr 17, 2009·Optics Letters·Inkyu Moon, Bahram Javidi
Jun 25, 2007·Optics Express·Shi Yuqing
Feb 1, 1995·Optics Letters·B F Pouet, S Krishnaswamy
Apr 15, 2010·Optics Express·Kai LiuLaurence G Hassebrook
Jun 10, 1993·Applied Optics·J M Huntley, H Saldner
Feb 15, 2012·Optics Express·Miguel A NavarroJavier Vargas

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Citations

Jun 21, 2012·Optics Express·Howard Y H HuangG Barbastathis
Nov 13, 2013·Applied Optics·Jing-Feng Weng, Yu-Lung Lo
May 15, 2015·Optics Express·Behnam TayebiDug Young Kim
Nov 2, 2014·Optics Letters·Behnam TayebiDug Young Kim

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