We propose to add an optical component in front of a conventional camera to improve depth estimation performance of Depth from Defocus (DFD), an approach based on the relation between defocus blur and depth. The add-on is an afocal doublet, which adds chromatic aberration to the global system. This overcomes ambiguity and dead zone, which are the fundamental limitations of DFD with a conventional camera since the blur become unambiguous and measurable for each depth. In this paper we present the principle of the add-on, a theoretical performance model and experiments on real prototype to illustrate the improvement of depth estimation performance with the proposed add-on.
P. Trouvé-Peloux, J. Sabater, F. Champagnat, G. Le Besnerais, and T. Avignon, "Chromatic add-on to improve depth from defocus with a conventional camera," Proc. SPIE 10677, Unconventional Optical Imaging, 1067709 (Presented at SPIE Photonics Europe: April 22, 2018; Published: 24 May 2018); https://doi.org/10.1117/12.2309477.
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