Dear Colleagues and Students,
You are cordially invited to the following talk organized
by the OPTICA Student Chapter, IIT (BHU).
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Title: Super-resolved Imaging of Obscured Objects
Speaker: Prof. Zeev Zalevsky, Faculty of Engineering,
Bar-Ilan University, Israel
Abstract:
In this presentation, several schemes will
be introduced that enable high-resolution imaging of obscured objects
positioned behind a scattering medium. The first concept involves a time
multiplexing super-resolving technique that does not require prior knowledge of
the projected encoding mask. By illuminating the object through the scattering
medium, speckle patterns are generated. Though these patterns are not known a
priori, the memory effect of the scattering medium allows preservation and
shifting of the same projected pattern. By capturing a large number of
low-resolution images encoded with time-shifted speckle patterns, a
high-resolution image can be reconstructed using an appropriate decoding
algorithm.
Additionally, two schemes enabling
3D-position tunable focusing through and behind scattering media will be
discussed. Both the illumination and detection modules are placed on the same
side of the inspected object, ensuring real-time, fast-converging imaging. The
underlying physics relies either on the forward–backward propagation symmetry
of the illuminating wave front through the same scattering medium, or on
temporal modulation of the spatial distribution of the illuminating beam using
pulsed light.
All presented techniques allow
reference-free, non-invasive imaging through scattering media, without
requiring direct access or feedback from the far side of the medium. These
methods hold promise as advanced tools for biological and medical non-invasive imaging
and diagnostics.
Venue: Seminar Hall, Department of Physics, IIT (BHU),
Varanasi
Date: 15th September 2025
Time: 5:00 PM – 6:00 PM
Looking
forward to seeing you all.
Regards,
Rakesh