# Agenda

## Signal Processing Seminar

- Thursday, 28 September 2017
- 13:30-14:30
- HB 17.150

### Graph Sampling for Covariance Estimation

**Geert Leus**

In this talk, the focus is on subsampling as well as reconstructing the second-order statistics of signals residing on nodes of arbitrary undirected graphs. Second-order stationary graph signals may be obtained by graph filtering zero-mean white noise and they admit a well-defined power spectrum whose shape is determined by the frequency response of the graph filter. Estimating the graph power spectrum forms an important component of stationary graph signal processing and related inference tasks such as Wiener prediction or inpainting on graphs. The central result is that by sampling a significantly smaller subset of vertices and using simple least squares, we can reconstruct the second-order statistics of the graph signal from the subsampled observations, and more importantly, without any spectral priors. To this end, both a nonparametric approach as well as parametric approaches are considered. The results specialize for undirected circulant graphs in that the graph nodes leading to the best compression rates are given by the so-called minimal sparse rulers.

Additional information ...### Agenda

- Thu, 17 Jan 2019
- 13:30
- HB 17.150

### Signal Processing Seminar

#### Wangyang Yu

#### audio signal processing

- Thu, 24 Jan 2019
- 14:30
- Aula Senaatszaal

### PhD Thesis Defence

#### Jeroen van Gemert

#### Efficient computational methods in Magnetic Resonance Imaging

How to design dielectric pads that can be used to increase image quality inMagnetic Resonance Imaging, and how to accelerate image reconstruction times using a preconditioner.

- Mon, 28 Jan 2019
- 12:00
- Aula Senaatszaal

### PhD Thesis Defence

#### Elvin Isufi

#### Graph-Time Signal Processing Filtering and Sampling Strategies

Design of graph filters where nodes exchange information only with their neighbors to perform a given filter operation: how can distributed FIR and IIR graph filters be made?

- Thu, 31 Jan 2019
- 13:30
- HB 17.150

### Signal Processing Seminar

#### Tarik Kazaz

#### Wireless communication and networking, Digital Design

- Thu, 14 Feb 2019
- 13:30
- HB 17.150

### Signal Processing Seminar

#### Jac Romme

#### Signal processing for communication, sensor networks

- Thu, 28 Feb 2019
- 13:30
- HB 17.150

### Signal Processing Seminar

#### Borbála Hunyadi

#### Biomedical signal processing

- Thu, 14 Mar 2019
- 13:30
- HB 17.150