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Proceedings Paper

Focused image creation approaches for macroscopic objects encoded in digital holograms
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Paper Abstract

When a digital hologram is reconstructed only points on objects within the depth of focus at the reconstruction distance are in focus. For complex scenes, scenes containing multiple objects or multiple object features located at different depths, this can lead to a reconstruction with large blurred regions. Using a depth-from-focus algorithm we have developed an approach to extract an objects depth information in the form of a depth map from volumes of reconstructions, where each reconstruction in the volume is a reconstruction at a different focal plane. By combining the depth map with the volume of reconstructions used to calculate the depth map we can create an image, an extended focus image, where the full scene is in focus. To our knowledge, this is the first technique which creates extended focused images of digital holograms encoding macroscopic objects. We present results for digital holograms containing low and high contrast macroscopic objects.

Paper Details

Date Published: 8 May 2008
PDF: 12 pages
Proc. SPIE 6994, Photon Management III, 69940U (8 May 2008); doi: 10.1117/12.782781
Show Author Affiliations
C. P. Mc Elhinney, National Univ. of Ireland, Maynooth (Ireland)
B. M Hennelly, National Univ. of Ireland, Maynooth (Ireland)
T. J. Naughton, National Univ. of Ireland, Maynooth (Ireland)
Univ. of Oulu (Finland)

Published in SPIE Proceedings Vol. 6994:
Photon Management III
John T. Sheridan; Frank Wyrowski, Editor(s)

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