Variational methods, new optimisation techniques and new fast numerical algorithms
VMVW01
4 September 2017 to 8 September 2017
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Workshop theme
Variational image processing typically leads to minimization problems which can be characterized by one or several of the following features: (extremely) large-scale, non-convex, non-smooth, or combinatorial. Each if these remarkable properties may be substantiated as follows: (i) The increase in the size of problem instances can be attributed to the ever increasing number of data collected by modern devices, the need to merge data from various sources (multi-modality) or the type of application (such as, e.g., video surveillance) generating vast data. (ii) Non-smoothness has been of interest to the imaging community with the inception of total variation regularization by Rudin, Osher and Fatemi in their seminal work in Physica D, 1992. Besides non-smooth regularization, non-smooth data fidelity terms have become important in order to cope, e.g., with impulse noise. But non-smoothness is also an issue in optimal parameter learning, which naturally leads to bilevel optimization problems. In cases (such as in case of total variation regularization) when the optimal solution of the lower level problem (i.e., the variational model with fixed regularization parameter) is characterized by a variational inequality, which contains the regularization parameter(s) as parameters in its own right, the overall problem falls into the realm of mathematical programs with equilibrium constraints. Such problems are non-smooth, non-convex, and they notoriously lack constraint qualification, all of which challenge stationarity principles and in particular numerical solution schemes. (iii) Non-convexity, on the other hand, is of independent interest, e.g., in image inpainting, segmentation, clustering and as a filter. An example for the latter is the l^p-quasi-norm regularization (0<p<1, instead of convex l^1-norms) in compressive sensing. (iv) Issues with combinatorial complexity when finding solutions arise in (global) minimizations in clustering, the parameter learning described above, or inpainting, to name only a few. Whenever the variational principle is originally posed in function space, then all of the aforementioned applications typically lead to highly non-linear and possibly non-smooth (systems of) partial differential equations (PDEs). On the other hand, methods based on graphs have become popular recently in image processing as they aim to guarantee (global) rather than approximate (local) solutions, possibly at the cost of non-polynomial complexity. Therefore, the aims of this workshop are to discuss recent advances in (ideally mesh independent) solvers for the associated PDE or variational inequalities, their implementation on modern computer architectures (GPU, Clusters), and the connection of these methods to solvers based on combinatorial or graph-based techniques. In particular, also the issues with fixed-point-type, first-order (gradient-based) and high-order (e.g., Newton-type) solvers and associated future directions for the community will be addressed.
Further goals of this workshop are algorithmic challenges associated with global optimization and convex relaxation methods in image processing (with a focus on compressed sensing and level set based approaches). In particular, connections between convex relaxation methods and nonsmooth/nonlinear optimization algorithms; relationships between graph theory, combinatorial and continuous optimizations; and relaxation methods for spectral and inference data models in machine learning will be addressed.
Workshop speaker list and timetable can be found in the menu on the left hand side of this overview page.
Deadline for applications: 01 June 2017
Please note members of Cambridge University are welcome to turn up and sign in as a non-registered attendee on the day(s) during the workshop and attend the lecture(s). Please note that we cannot provide you with any support including name badge, meals or accommodation.
In addition to visiting the INI, there are multiple ways in which you can participate remotely.
Fees
Registration Only
- Registration Package: £227
- Student Registration Package: £177
The Registration Package includes admission to all seminars, lunches and refreshments on the days that lectures take place (Monday - Friday), wine reception and formal dinner, but does not include other meals or accommodation.
Registration and Accommodation
- Accommodation Package: £577
The Accommodation Package includes a registration fee, bed and breakfast accommodation at Churchill College from the evening of Sunday 3rd September 2017 to breakfast on Saturday 9th September 2017, together with lunches and refreshments during the days that lectures take place (Monday - Friday). The formal dinner is also included, but no other evening meals.
Formal Dinner Only
- Formal Dinner: £50
Participants on the Accommodation Package or Registration Package, including organisers and speakers, are automatically included in this event. For all remaining participants who would like to attend the above charge will apply.
Accommodation
Accommodation in single study bedrooms with shared facilities, breakfast and lunches are provided at Churchill College,
Meals
Lunch
Lunch will be served at Wolfson Court in the Cafeteria from 12:30 to 13:30 on days that lectures take place.
- Accommodation Package and Registration Package participants should present their badge as payment for their meal
- Those issued with a blue Institute door entrance card can add money onto the card via the Porters' Lodge at Wolfson Court
- Other participants must purchase their meal using their dining card via the Porters' Lodge (forms can be found on the registration desk or at the Porters' Lodge)
Evening Meal
Participants are free to make their own arrangements for dinner.
Formal Dinner
The Formal Dinner will take place on Wednesday 6th September at Emmanuel College. Participants on the Accommodation Package or Registration Package, including organisers and speakers, are automatically included in this event.
Timetable
| Monday 4th September 2017 | |||
|---|---|---|---|
| 09:00 to 09:40 | No Room Required | ||
| 09:40 to 09:50 | No Room Required | ||
| 09:50 to 10:40 |
Joachim Weickert Universität des Saarlandes |
Room 1 | 
|
| 10:40 to 11:10 | No Room Required | ||
| 11:10 to 12:00 |
Yuri Boykov University of Western Ontario |
Room 1 |
|
| 12:00 to 12:50 |
Alfred Bruckstein Technion - Israel Institute of Technology; Nanyang Technological University |
Room 1 |
|
| 12:50 to 14:00 | No Room Required | ||
| 14:00 to 14:50 |
Martin Burger Universität Münster |
Room 1 |
|
| 14:50 to 15:40 |
Guy Gilboa Technion - Israel Institute of Technology |
Room 1 |
|
| 15:40 to 16:10 | No Room Required | ||
| 16:10 to 17:00 |
Jean-Francois Aujol Université Bordeaux 1 |
Room 1 |
|
| 17:00 to 17:10 | No Room Required | ||
| 17:10 to 18:10 | No Room Required | ||
| Tuesday 5th September 2017 | |||
|---|---|---|---|
| 09:00 to 09:50 |
Antonin Chambolle CNRS (Centre national de la recherche scientifique); École Polytechnique |
Room 1 |
|
| 09:50 to 10:40 |
Ke Chen University of Liverpool |
Room 1 |
|
| 10:40 to 11:10 | No Room Required | ||
| 11:10 to 12:00 |
Michael Ng Hong Kong Baptist University |
Room 1 |
|
| 12:00 to 12:50 |
Kristian Bredies University of Graz |
Room 1 |
|
| 12:30 to 18:00 |
Computational Challenges in Image Processing - http://www.turing-gateway.cam.ac.uk/event/ofbw32 |
Discussion Room | |
| 12:50 to 14:00 | No Room Required | ||
| Wednesday 6th September 2017 | |||
|---|---|---|---|
| 09:00 to 09:50 |
Laurent Cohen CNRS & Université Paris-Dauphine |
Room 1 |
|
| 09:50 to 10:40 |
Tom Goldstein University of Maryland, College Park |
Room 1 |
|
| 10:40 to 11:10 | No Room Required | ||
| 11:10 to 12:00 |
Vladimir Kolmogorov Institute of Science and Technology (IST Austria) |
Room 1 |
|
| 12:00 to 12:50 |
Sung Ha Kang Georgia Institute of Technology |
Room 1 |
|
| 12:50 to 14:00 | No Room Required | ||
| 14:00 to 14:50 |
Jalal Fadili Ecole Nationale Superieure d'Ingenieurs de Caen |
Room 1 |
|
| 14:50 to 15:40 |
Zuoqiang Shi Tsinghua University |
Room 1 |
|
| 15:40 to 16:10 | No Room Required | ||
| 16:10 to 17:00 |
Gabriele Steidl University of Kaiserslautern |
Room 1 | |
| 19:30 to 22:00 | No Room Required | ||
| Thursday 7th September 2017 | |||
|---|---|---|---|
| 09:00 to 09:50 |
Xue-Cheng Tai Hong Kong Baptist University; Universitetet i Bergen |
Room 1 |
|
| 09:50 to 10:40 |
Thomas Pock Graz University of Technology |
Room 1 |
|
| 10:40 to 11:10 | No Room Required | ||
| 11:10 to 12:00 |
Dimitris Metaxas Rutgers, The State University of New Jersey |
Room 1 | |
| 12:00 to 12:50 |
Yiqiu Dong Technical University of Denmark |
Room 1 |
|
| 12:50 to 14:00 | No Room Required | ||
| 14:00 to 14:50 |
Michael Moeller Universität Siegen |
Room 1 | |
| 14:50 to 15:40 |
Audrey Repetti Heriot-Watt University |
Room 1 | |
| 15:40 to 16:10 | No Room Required | ||
| 16:10 to 17:00 |
Christian Clason Universität Duisburg-Essen |
Room 1 |
|
| Friday 8th September 2017 | |||
|---|---|---|---|
| 09:00 to 09:50 |
Mila Nikolova CNRS (Centre national de la recherche scientifique); ENS de Cachan |
Room 1 |
|
| 09:50 to 10:40 |
Michael Unser EPFL - Ecole Polytechnique Fédérale de Lausanne |
Room 1 |
|
| 10:40 to 11:10 | No Room Required | ||
| 11:10 to 12:00 |
Pierre Weiss Université de Toulouse |
Room 1 |
|
| 12:00 to 12:50 |
Olga Veksler University of Western Ontario |
Room 1 |
|
| 12:50 to 14:00 | No Room Required | ||
| 14:00 to 14:50 |
Thomas Vogt Universität zu Lübeck |
Room 1 |
|
| 14:50 to 15:40 |
Martin Holler University of Graz |
Room 1 |
|
| 15:40 to 16:10 | No Room Required | ||
| 16:10 to 17:00 |
Tammy Riklin raviv Ben-Gurion University |
Room 1 |
|
Organisers
- Yuri Boykov University of Western Ontario
- Antonin Chambolle CNRS (Centre national de la recherche scientifique); École Polytechnique
- Ke Chen University of Liverpool
- Thomas Pock Graz University of Technology
- Christoph Schnoerr Universität Heidelberg
- Xue-Cheng Tai Hong Kong Baptist University
Speakers
- Jean-Francois Aujol Université Bordeaux 1
- Yuri Boykov University of Western Ontario
- Kristian Bredies University of Graz
- Alfred Bruckstein Technion - Israel Institute of Technology; Nanyang Technological University
- Martin Burger Universität Münster
- Antonin Chambolle CNRS (Centre national de la recherche scientifique); École Polytechnique
- Ke Chen University of Liverpool
- Christian Clason Universität Duisburg-Essen
- Laurent Cohen CNRS & Université Paris-Dauphine
- Yiqiu Dong Technical University of Denmark
- Jalal Fadili None / Other
- Guy Gilboa Technion - Israel Institute of Technology
- Tom Goldstein University of Maryland, College Park
- Martin Holler University of Graz
- Sung Ha Kang Georgia Institute of Technology
- Vladimir Kolmogorov Institute of Science and Technology (IST Austria)
- Dimitris Metaxas Rutgers, The State University of New Jersey
- Michael Moeller Universität Siegen
- Michael Ng Hong Kong Baptist University
- Mila Nikolova CNRS (Centre national de la recherche scientifique); ENS de Cachan
- Thomas Pock Graz University of Technology
- Audrey Repetti Heriot-Watt University
- Tammy Riklin raviv Ben-Gurion University
- Zuoqiang Shi Tsinghua University
- Gabriele Steidl University of Kaiserslautern
- Xue-Cheng Tai Hong Kong Baptist University
- Michael Unser EPFL - Ecole Polytechnique Fédérale de Lausanne
- Olga Veksler University of Western Ontario
- Thomas Vogt Universität zu Lübeck
- Joachim Weickert Universität des Saarlandes
- Pierre Weiss Université de Toulouse
Participants
- Lourdes Agapito University College London
- Daniel Alexander University College London
- Simon Arridge University College London
- John Aston University of Cambridge
- Jean-Francois Aujol Université Bordeaux 1
- Alexander Belyaev Heriot-Watt University
- Simon Bittleston None / Other
- Claire Boyer Université Pierre et Marie Curie Paris
- Yuri Boykov University of Western Ontario
- Kristian Bredies University of Graz
- Eva-Maria Brinkmann Westfalische Wilhelms-Universitat Munster
- Alfred Bruckstein Technion - Israel Institute of Technology; Nanyang Technological University
- Christoph Brune Universiteit Twente
- Martin Burger Universität Münster; Westfalische Wilhelms-Universitat Munster
- Luca Calatroni École Polytechnique
- Antonin Chambolle CNRS (Centre national de la recherche scientifique); École Polytechnique
- Jialing Chen University of Dundee
- Ke Chen University of Liverpool
- Christian Clason Universität Duisburg-Essen
- Laurent Cohen CNRS & Université Paris-Dauphine
- Veronica Corona University of Cambridge
- Juan Carlos De Los Reyes Escuela Politécnica Nacional de Quito
- Yiqiu Dong Technical University of Denmark
- Jalal Fadili Ecole Nationale Superieure d'Ingenieurs de Caen
- Tal Feld Technion - Israel Institute of Technology
- Andrew Fitzgibbon Microsoft (UK)
- Lena Frerking Universität Münster
- Janic Föcke Universität Münster
- Silvia Gazzola University of Bath
- Guy Gilboa Technion - Israel Institute of Technology
- Tom Goldstein University of Maryland, College Park
- Michael Hintermüller Weizmann Institute of Science; Humboldt-Universität zu Berlin
- Martin Holler University of Graz
- Ian Jermyn Durham University
- Sung Ha Kang Georgia Institute of Technology
- Blaine Keetch University of Nottingham
- Nick Kingsbury University of Cambridge
- Vladimir Kolmogorov Institute of Science and Technology (IST Austria)
- Germana Landi University of Bologna
- Dimitris Metaxas Rutgers, The State University of New Jersey
- Michael Moeller Universität Siegen
- Michael Ng Hong Kong Baptist University
- Mila Nikolova CNRS (Centre national de la recherche scientifique); ENS de Cachan
- Kostas Papafitsoros Weierstraß-Institut für Angewandte Analysis und Stochastik
- George Papanikos University of Nottingham
- Gabriel Peyre CNRS - Ecole Normale Superieure Paris
- Thomas Pock Graz University of Technology
- Talal Rahman Universitetet i Bergen
- Julian Rasch Westfalische Wilhelms-Universitat Munster
- Audrey Repetti Heriot-Watt University
- Tammy Riklin raviv Ben-Gurion University
- Carola-Bibiane Schönlieb University of Cambridge
- Zuoqiang Shi Tsinghua University
- Yuying Shi None / Other
- Jack Spencer University of Liverpool
- Gabriele Steidl University of Kaiserslautern
- Hongpeng Sun Renmin University of China; None / Other
- Xue-Cheng Tai Hong Kong Baptist University; Universitetet i Bergen
- Marc Teboulle Tel Aviv University
- Michael Unser EPFL - Ecole Polytechnique Fédérale de Lausanne
- Olga Veksler University of Western Ontario
- Joachim Weickert Universität des Saarlandes
- Pierre Weiss Université de Toulouse
- Bin Wu Universitetet i Bergen
- Evren Yarman Schlumberger Cambridge Research
- Ke Yin Huazhong University of Science and Technology
- Daoping Zhang University of Liverpool
- Kewei Zhang University of Nottingham
- Yonggui Zhu University of Liverpool
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