FYI - seminar with free breakfast next week!
/Pontus
Subject: | AID Breakfast Seminar with Niels Christian Overgaard, Oct 8 at 9.00 in E:2311 |
---|---|
Date: | Wed, 25 Sep 2024 09:45:38 +0200 |
From: | Liang Liu <liang.liu@eit.lth.se> |
To: | Viktor Larsson <viktor.larsson@math.lth.se>, Pontus Giselsson <pontus.giselsson@control.lth.se>, Emma Söderberg <emma.soderberg@cs.lth.se> |
Hi
All,
Here
comes the information for our next breakfast seminar.
BR
/Liang
==============================================================================================
Please join
us for the next breakfast seminar sponsored by LTH Profile Area: AI and
Digitalization (AID) with Niels Christian
Overgaard,
Math on Oct. 8
2024
at 09:00-10:00 in E:2311.
There will be free breakfast.
** Please sign up here by
Oct.
2 ***
When: Tuesday
Oct.
8th at 09:00-10:00, E building, E:2311 (second floor)
Speaker: Niels Christian Overgaard
Title: Finding the Lipschitz constant
needed for efficient scene recovery from CASSI measurements
Abstract: The linear inverse problem
associated with the standard model for hyperspectral image
recovery from CASSI measurements is considered. This is a
total variation-regularized least squares problem which is
usually solved using first-order iterative minimization
algorithms, e.g. ISTA or FISTA. These methods all require
as input an appropriate step length. This step length is
related to the Lipschitz constant for the gradient of the
quadratic loss function, and equals the square of the
largest singular value of the measurement map. In
applications, this number is usually computed directly as
the largest eigenvalue of a huge square matrix - a
compuation that sometimes becomes a bottleneck in an
otherwise optimized algorithm. We have effectively eliminate
this bottleneck for CASSI reconstructions by showing how the
Lipschitz constant can be calculated from a square matrix
whose size is easily three orders of magnitudes smaller than
in the direct approach.
Upcoming breakfast seminar
The breakfast seminars
are scheduled once per month with the main purpose of
triggering multi-disciplinary discussions and potential
collaborations. These are the upcoming planned slots:
Speaker and
registration details will be sent out closer to each slot.
Welcome!
The AID breakfast seminar
coordinators.