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SCIEN and EE292E present "Light field and wavefront phase acquisition"

Light field and wavefront phase acquisition
Wednesday, November 13, 2019 - 4:30pm
Packard 101
Professor José Manuel Rodríguez-Ramos (University of La Laguna, Spain; founder of Wooptix)
Abstract / Description: 

Light fields can be understood as the knowledge of the intensity and direction of each ray. But the light field does not contain the diffraction effects. The wavefront phase measurement does allow an approach to the measurement of these effects. The wavefront phase sensors are fundamental in any Adaptive Optics (AO) system, both in Astronomy and Ophthalmology. With AO it is possible to correct the images degraded by the atmospheric turbulence in large telescopes or sharply improve the retina images of the human eye. In fact, the wavefront phase is proportional to the refractive index changes, that is, it serves to detect structure in transparent objects. The same data acquired by a plenoptic sensor can be used to obtain the tomographic distribution of the atmosphere over the telescope, but also to detect transparent biological tissue, such as the neuronal one, in microscopes and without needing chemical markers. In this talk we will explain how to use the wavefront phase sensors as a complement to the acquisition of the light field, and we will show direct applications in fields as disparate as computational imaging (SEBI camera: real-time Full-HD single lens light field camera), silicon metrology (one-shot subnanometer accuracy on silicon wafers), and ophthalmology (wow!).

Demo following the talk: Wooptix presents the first light field video camera using a single adaptive optics lens; no resolution killing micro lens array. The light field video is processed live using a high end PC graphic card and displayed in HD resolution on a 3D display (no head worn glasses) using the 2D all-in-focus image coupled with a depth map generated using the focal stack. The demo consist of a small handheld video camera with adaptive optics, a PC for instant light field video processing, and a 3D display for live viewing of our light field video.


Jose M. Rodríguez-Ramos received his Ph.D. from IAC (Instituto de Astrofísica de Canarias) in March 1997. He is Associate Professor at the University of La Laguna since 2001. His research focuses on Adaptive Optics for Astronomy, but now is trying to transfer this experience to other fields such as computational imaging, silicon metrology, ophthalmology, microscopy... after founding Wooptix, an Intel´s portfolio company (2016), where nowadays he combines the CEO and CTO roles.