Advanced light-field refocusing through tomographic modeling of the photographed scene
Optics Express , Volume 27 - Issue 6 p. 7834- 7856
Recently we have shown that light-field photography images can be interpreted as limited-angle cone-beam tomography acquisitions. Here, we use this property to develop a direct-space tomographic refocusing formulation that allows one to refocus both unfocused and focused light-field images. We express the reconstruction as a convex optimization problem, thus enabling the use of various regularization terms to help suppress artifacts, and a wide class of existing advanced tomographic algorithms. This formulation also supports super-resolved reconstructions and the correction of the optical system’s limited frequency response (point spread function). We validate this method with numerical and real-world examples.
|Imagine Optic, Bordeaux, France|
|Volumetric medical x-ray imaging at extremely low dose|
|Organisation||Centrum Wiskunde & Informatica, Amsterdam (CWI), The Netherlands|
Viganò, N.R, Martínez Gil, P.M, Herzog, C, de la Rochefoucauld, O, Liere, R.V. (Robert Van), & Batenburg, K.J. (2019). Advanced light-field refocusing through tomographic modeling of the photographed scene. Optics Express, 27(6), 7834–7856. doi:10.1364/OE.27.007834