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Proceedings Paper

Extended depth-of-field (EDoF) using sharpness transport across colour channels
Author(s): Christel-Loic Tisse; Hoang Phi Nguyen; Régis Tessières; Marine Pyanet; Frédéric Guichard
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Paper Abstract

In this paper we present an approach to obtain an extended Depth-of-Field (DoF) for cell phone miniature camera by jointly optimizing optical system and post-capture digital processing techniques. Using a computational imaging approach, we demonstrate how to increase, to a useful operating range, the effective DoF of a specifically designed fixed focus lens operating e.g. at f/2.8. This is achieved with a lens design where the longitudinal chromatic aberration has been increased. This increase is controlled so as to have, for any distance within the extended DoF, at least one colour channel of a RGB image which contains the in-focus scene information (e.g. high frequencies). By determining the sharpest colour (for each region in the digital image) and reflecting its sharpness on the others, we show that it is possible to get a sharp image for all colours through the merged DoF of the three of them. We compare our technique with other approaches that also aimed to increase the DoF such as Wavefront coding.

Paper Details

Date Published: 11 September 2008
PDF: 12 pages
Proc. SPIE 7061, Novel Optical Systems Design and Optimization XI, 706105 (11 September 2008); doi: 10.1117/12.793826
Show Author Affiliations
Christel-Loic Tisse, DxO Labs. (France)
Hoang Phi Nguyen, DxO Labs. (France)
Régis Tessières, DxO Labs. (France)
Marine Pyanet, DxO Labs. (France)
Frédéric Guichard, DxO Labs. (France)

Published in SPIE Proceedings Vol. 7061:
Novel Optical Systems Design and Optimization XI
R. John Koshel; James D. Moore; David H. Krevor; G. Groot Gregory, Editor(s)

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