Focused image creation approaches for macroscopic objects encoded in digital holograms


McElhinney, Conor P. and Hennelly, Bryan M. and Naughton, Thomas J. (2008) Focused image creation approaches for macroscopic objects encoded in digital holograms. Proceedings of SPIE, 6994. 69940U. ISSN 0277-786X

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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.

Item Type: Article
Keywords: digital holgraphy; image processing; three-dimensional image processing; focus detection; depth estimation; focused imaging;
Academic Unit: Faculty of Science and Engineering > Computer Science
Item ID: 8458
Identification Number: 10.1117/12.782781
Depositing User: Thomas Naughton
Date Deposited: 13 Jul 2017 16:23
Journal or Publication Title: Proceedings of SPIE
Publisher: SPIE
Refereed: Yes
Funders: Science Foundation Ireland, Enterprise Ireland, Irish Research Council for Science Engineering and Technology (IRCSET), European Commission
URI:

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