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Proceedings Article

Removing the twin image in digital holography by segmented filtering of in-focus twin image

[+] Author Affiliations
C. McElhinney, B. M. Hennelly, L. Ahrenberg

National Univ. of Ireland, Maynooth (Ireland)

T. J. Naughton

National Univ. of Ireland, Maynooth (Ireland) and Univ. of Oulu (Finland)

Proc. SPIE 7072, Optics and Photonics for Information Processing II, 707208 (September 03, 2008); doi:10.1117/12.795894
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From Conference Volume 7072

  • Optics and Photonics for Information Processing II
  • Abdul A. S. Awwal; Khan M. Iftekharuddin; Bahram Javidi
  • San Diego, California, USA | August 10, 2008

abstract

We propose and investigate a new digital method for the reduction of twin-image noise from digital Fresnel holograms. For the case of in-line Fresnel holography the unwanted twin is present as a highly corruptive noise when the object image is numerically reconstructed. We propose to firstly reconstruct the unwanted twin-image when it is in-focus and in this plane we calculate a segmentation mask that borders this in focus image. The twin-image is then segmented and removed by simple spatial filtering. The resulting digital wavefield is the inverse propagated to the desired object image plane. The image is free of the twin-image resulting in improved quality reconstructions. We demonstrate the segmentation and removal of the unwanted twin-image from in-line digital holograms containing real-world macroscopic objects. We offer suggestions for its rapid computational implementation.

© (2008) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

C. McElhinney ; B. M. Hennelly ; L. Ahrenberg and T. J. Naughton
"Removing the twin image in digital holography by segmented filtering of in-focus twin image", Proc. SPIE 7072, Optics and Photonics for Information Processing II, 707208 (September 03, 2008); doi:10.1117/12.795894; http://dx.doi.org/10.1117/12.795894


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