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Fringe pattern denoising using coherence-enhancing diffusion.

Authors
  • Wang, Haixia
  • Kemao, Qian
  • Gao, Wenjing
  • Lin, Feng
  • Seah, Hock Soon
Type
Published Article
Journal
Optics letters
Publication Date
Apr 15, 2009
Volume
34
Issue
8
Pages
1141–1143
Identifiers
PMID: 19370097
Source
Medline
License
Unknown

Abstract

Electronic speckle pattern interferometry is one of the methods measuring the displacement on object surfaces in which fringe patterns need to be evaluated. Noise is one of the key problems affecting further processing and reducing measurement quality. We propose an application of coherence-enhancing diffusion to fringe-pattern denoising. It smoothes a fringe pattern along directions both parallel and perpendicular to fringe orientation with suitable diffusion speeds to more effectively reduce noise and improve fringe-pattern quality. It is a generalized work of Tang's <em>et al.'s</em> [Opt. Lett.33, 2179 (2008)] model that only smoothes a fringe pattern along fringe orientation. Since our model diffuses a fringe pattern with an additional direction, it is able to denoise low-density fringes as well as improve denoising effectiveness for high-density fringes. Theoretical analysis as well as simulation and experimental verifications are addressed.

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