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 +

Funded by: Science Foundation Ireland (SFI)

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

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