Extended depth-of-field (EDoF) using sharpness transport across colour channels

Christel-Loic Tisse; Hoang Phi Nguyen; Régis Tessières; Marine Pyanet; Frédéric Guichard

doi:10.1117/12.793826

11 September 2008 Extended depth-of-field (EDoF) using sharpness transport across colour channels

Christel-Loic Tisse, Hoang Phi Nguyen, Régis Tessières, Marine Pyanet, Frédéric Guichard

Proceedings Volume 7061, Novel Optical Systems Design and Optimization XI; 706105 (2008) https://doi.org/10.1117/12.793826
Event: Optical Engineering + Applications, 2008, San Diego, California, United States

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.

Citation Download Citation

Christel-Loic Tisse, Hoang Phi Nguyen, Régis Tessières, Marine Pyanet, and Frédéric Guichard "Extended depth-of-field (EDoF) using sharpness transport across colour channels", Proc. SPIE 7061, Novel Optical Systems Design and Optimization XI, 706105 (11 September 2008); https://doi.org/10.1117/12.793826

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available