Application of preconditioned alternating direction method of multipliers in depth from focal stack

Hossein Javidnia; Peter Corcoran

doi:10.1117/1.JEI.27.2.023019

6 April 2018 Application of preconditioned alternating direction method of multipliers in depth from focal stack

Hossein Javidnia, Peter Corcoran

Author Affiliations +

Journal of Electronic Imaging, Vol. 27, Issue 2, 023019 (April 2018). https://doi.org/10.1117/1.JEI.27.2.023019

Abstract

Postcapture refocusing effect in smartphone cameras is achievable using focal stacks. However, the accuracy of this effect is totally dependent on the combination of the depth layers in the stack. The accuracy of the extended depth of field effect in this application can be improved significantly by computing an accurate depth map, which has been an open issue for decades. To tackle this issue, a framework is proposed based on a preconditioned alternating direction method of multipliers for depth from the focal stack and synthetic defocus application. In addition to its ability to provide high structural accuracy, the optimization function of the proposed framework can, in fact, converge faster and better than state-of-the-art methods. The qualitative evaluation has been done on 21 sets of focal stacks and the optimization function has been compared against five other methods. Later, 10 light field image sets have been transformed into focal stacks for quantitative evaluation purposes. Preliminary results indicate that the proposed framework has a better performance in terms of structural accuracy and optimization in comparison to the current state-of-the-art methods.

Citation Download Citation

Hossein Javidnia and Peter Corcoran "Application of preconditioned alternating direction method of multipliers in depth from focal stack," Journal of Electronic Imaging 27(2), 023019 (6 April 2018). https://doi.org/10.1117/1.JEI.27.2.023019

Received: 5 January 2018; Accepted: 19 March 2018; Published: 6 April 2018

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