FYI - seminar with free breakfast next week!

/Pontus

-------- Forwarded Message -------- 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

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Please join us for the next breakfast seminar sponsored by LTH Profile Area: AI and Digitalization https://www.lth.se/english/research/profile-areas/pillars-of-ai-and-digitalization/ (AID) with *Niels Christian Overgaard*, Mathon *Oct.****8****2024 **at 09:00-10:00 *in E:2311.There will be* free breakfast.***

*** *Please sign up*here https://forms.gle/1h3RnhdAjVtSWpSk8*by***Oct.****2******

*When*: Tuesday Oct.8^th  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.

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*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:

* *Nov 5*, 09:00-10:00 @ Control * *Dec 3*, 09:00-10:00 @ Math

Speaker and registration details will be sent out closer to each slot.

Welcome!

The AID breakfast seminar coordinators.