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The Visual Computing Forum, or VCF, is a
series of seminars organized by the visualization
group with selected talks from the fields of
visualization, image processing, computer graphics,
and so on. The individual seminars are arranged
approximately once a month, on Fridays from 11am to
12am, and they will be interleaved with the MedViz seminars.
They will be held either at the Høyteknologisenteret
or at the VilVite
Science Center. If you wish to be informed about upcomming VCF events, please write an e-mail to "vcf.bergen@gmail.com", "Helwig.Hauser@UIB.no" or "Sergej.Stoppel@UIB.no".
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December 13, 2013
Brain Patterns: from EEG Coherence Networks to Prediction of
Neurodegenerative Diseases
Speaker: Prof. Jos Roerdink (Bernoulli Inst. for Mathematics and Univ. of Groningen)
Place:
Laboratoriebygget, room 9.1, 9th floor, Haukeland University Hospital
Time: Friday December 13, 2013, from 12.00am to 13.00am
Abstract:
In this talk, I will discuss some recent work on the visualization and
analysis of brain patterns
obtained from neuroimaging data, and their use in the understanding of
brain (mal)functioning.
In the first part
of the talk, I will discuss multichannel EEG recordings. From these
data, we extract functional unit (FU) maps, where each FU is a
data-driven region of interest (ROI) consisting of spatially connected
set of electrodes recording pairwise significantly coherent signals.
The method is applied to the analysis of EEG coherence networks in two
case studies, one on mental fatigue and one on patients with
corticobasal ganglionic degeneration (CBGD). We also discuss a
preliminary extension of the method to fMRI data.
The second part
of the talk is devoted to the recently started GLIMPS ("GLucose IMaging
in ParkinsonismS") project at the University of Groningen. This project
concerns the creation of a national database of FDG-PET scans which
reflect the glucose consumption of the brain in patients with
neuro-degenerative diseases. The goal is to identify distinctive
structural and functional brain patterns and derived quantities like
network patterns of brain activity, which display statistically
significant differences in healthy subjects and patients with certain
types of neuro-degenerative disease. The database will be used for
clinical practice as well as for research purposes. Pattern
classification and machine learning methods will be developed to
associate brain patterns to various types and stages of
neuro-degenerative disease. First results will be shown and discussed.
Additional material:
Flyer,
SVCG Gorup at the University of Groningen
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November 08, 2013
Geographic Visualization
Speakers: Cagatay Turkay (Ph.D Candidate, Visualization Group, UiB)
Place:
Room 5118, floor 5, Høyteknologisenteret (datablokk)
Time: Friday November 08, 2013, from 10.15am to 11.15am
Cagatay Turkay is a Ph.D. candidate at the Visualization Group,
University of Bergen. His research mainly focuses on the tight
integration of interactive visualizations, data analysis techniques and
explorative knowledge/capabilities of experts. He has a special
interest in high-dimensional, temporal data from bioinformatics and
biomolecular modelling domain. This talk is Cagatay's trial lecture.
Additional material:
Flyer,
Cagatay's webpage
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October 04, 2013
Algorithms for deformable image registration
Speakers: Erlend Hodneland (Dept. of Biomedicine, University of Bergen)
Place:
Room 2143, floor 2, Høyteknologisenteret (datablokk)
Time: Friday October 04, 2013, from 10.15am to 11.15am
Abstract:
Image registration is crucial for postprocessing of image time series.
Without motion correction the analysis and results easily get corrupted
by breathing artifacts and other type of motion. There exists a variety
of methods for deformable image registration. I will discuss the
mathematical and physical background for image registration within the
theory of linear elasticity, challenges related to the image
registration problem, as well as numerical solutions. Finally, I will
show results of image registration algorithms applied to DCE-MRI image
time series.
Additional material:
Flyer,
Slides,
Video
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September 19, 2013
VisBio workshop 2013
Place: Auditorium, VilVite Science Center
Time: Thursday September 19, from 08.45am 6.00pm
Abstract:
The rapid growth in volume, complexity, and diversity of biological
data represents an increasing challenge for researchers in many areas.
The aim of this workshop is to bring together experts from biology,
bioinformatics, and visualization to develop a joint understanding of
the key technologies, obstacles, and opportunities involved in in
generating insight from these large and highly complex data sets.
All the details are summarized on the dedicated
event page.
Additional material:
Event page
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August 23, 2013
Smart Visualization in Medicine
Speakers: Stefan Bruckner (Visualization Group, University of Bergen)
Place:
Room 2143, floor 2, Høyteknologisenteret (datablokk)
Time: Friday August 23, 2013, from 10.15am to 11.15am
Abstract:
Medicine has been a prominent driver for visualization research over
many years with application areas ranging from diagnostics to
intra-interventional guidance. Considerable success has been achieved
and many techniques have been adopted in clinical practice. However,
the transition from research prototypes to clinical applications also
gives rise to new challenges. Clinical application scenarios are
high-throughput and there is little time to fiddle with visualization
parameters and to tune individual settings. Hence, visualization
techniques need to be "smart" in the sense that they incorporate domain
knowledge to automate such tasks in a goal-oriented manner. In this
talk, I will discuss visualization and interaction concepts developed
to achieve these goals and present examples for their successful
realization.
Additional material:
Flyer,
Stefan Bruckner's webpage,
Slides
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July 1, 2013
Summer break!
We would like to thank once again our speakers and all of you who
attended our seminars! We are now taking a short break, the seminars
will resume on August 23. Have a nice summer!
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June 14, 2013
VCF + MedViz joint seminar
Place: CMR (Fantoftvegen 38, Bergen)
Time: Friday June 13, 2013, from 14.00am to 11.30am
Speaker 1: Anders Hansen (Research fellow, University of Cambridge, UK)
Abstract:
The field of compressed sensing has exploded since its beginning in
2004, and the applications vary from signal processing via medical
imaging to radar technology and seismic tomography. From the early
developments the potential to improve MRI was recognised, and, in fact,
some of the striking features of compressed sensing were discovered
when it was applied to toy models of MRI. In this talk I will give an
overview of the basics of compressed sensing and demonstrate how it can
be used to reduce acquisition time, and more importantly, how to
improve the quality of MRI images substantially.
Speaker 2: Petter E. Bjørstad (Head of the Dept. of Informatics, University of Bergen)
Abstract:
This talk will first touch on the process of transforming a concept
derived from research into a successful business. The lessons learned
are all from a business case developed by the speaker. How much of this
is applicable to other cases? Next, we will consider cross-disciplinary
research efforts and try discussing their potential for innovation
comparing with more uniform environments.
Note:
The seminar will be followed by an informal gathering, where we will
have the chance to exchange and discuss different topics.
Additional material:
Flyer
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May 31, 2013
Computational Photography
Speakers: Endre M. Lidal (Visualization Group, University of Bergen)
Place:
Lille Auditorium, floor 2, Høyteknologisenteret (datablokk)
Time: Friday May 31, 2013, from 10.15am to 11.15am
Abstract:
The number of digital cameras in the world has exploded in the recent
years. Today, each of us owns a handful of cameras, not only in the
form of compact or SLR cameras, but also in our cellphones, on our
laptops, tablets, etc. At the same time the computational powers of all
devices has increased tremendously. Surprisingly, the model that even
our most modern digital cameras are based on, the camera obscura, has
almost been unchanged the last 100 years. The topic of this talk, the
research field of computational photography, aims at taking advantage
of the recent advantages of computational powers to changing the camera
model and even photography as we know it today.
In the talk, I will introduce the many different aspects of
computational photography, such as high dynamic range imaging, light
field capturing, generalized lenses, and coded photography. The talk
will conclude with a discussion on the future of photography, in
addition to providing a list of resources for further investigations.
Endre M. Lidal is a PhD-student in the visualization group in
department of informatics at university of Bergen, Norway. He submitted
his dissertation titled Sketch-based
Storytelling for Cognitive Problem Solving - Externalization,
Evaluation, and Communication in Geology
on April 12, 2013. The defense is scheduled for June 25, 2013. This
VCF-talk is the trial lecture of Lidal.
Additional material:
Flyer,
Slides
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April 26, 2013
Modeling Terrains and Subsurface Geology
Speakers: Mattia Natali (Visualization Group, University of Bergen)
Place:
Konferanserom B (TM51:KONFB) - VilVite Science Center, Thormølensgate
51
Time: Friday April 26, 2013, from 10.15am to 11.15am
Abstract:
The process of creating terrain and landscape models is important in a
variety of computer graphics and visualization applications: from films
and computer games, via flight simulators and landscape planning, to
scientific visualization and subsurface modelling. Interestingly, the
modelling techniques used in this large range of application areas have
started to meet in the last years. New trends in geological modelling
are approaching the modelling methods that have been developed in
computer graphics. I will give an introduction to the process of
geological modelling followed by two taxonomies with descriptions and
comparisons of selected methods. The first taxonomy of different
modelling methods is a data oriented taxonomy, where modelling is
categorized into three different scenarios: the data-free, the
sparse-data and the dense-data scenario. Then I will show a workflow
oriented taxonomy, where modelling is divided into the separate stages
necessary for creating a geological model.
Additional material:
Flyer,
Slides,
Related article
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March 22, 2013
Real-time segmentation of 3D echocardiograms, using a state estimation
approach with deformable models
Speakers: Fredrik Orderud (R&D engineer, GE Vingmed Ultrasound - GE Healthcare)
Place: Lille Auditorium, floor 2, Høyteknologisenteret (datablokk)
Time: Friday March 22, 2013, from 10.15am to 11.15am
Abstract:
We present an approach for using state estimation methods for
segmentation and real-time tracking of structures in 3D cardiac
ultrasound. A Kalman tracking framework is used to compute a
least-squares fitting or active-shape surfaces and subdivision surfaces
to boundaries in volumetric image data using edge-detection
measurements, optionally in combination with speckle-tracking
measurements. Typical execution times are 5ms per model per frame on
standard computer hardware. Recent edge-detection improvements and
biomechanical (FEM) regularization for multi-resolution segmentation
will also be covered.
Additional material:
Flyer,
Fredrik Orderud's webpage
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March 1, 2013
Aging - cognition, brain imaging and genetics
Speakers:
- Astri Johansen Lundervold (Department of Biological and Medical
Psychology)
- Arvid Lundervold (Department of Biomedicine)
Place: Lille Auditorium, floor 2, Høyteknologisenteret (datablokk)
Time: Friday March 1, 2013, from 10.15am to 11.15am
Abstract:
Aging is associated with cognitive decline and associated changes in
brain structure and function, modulated by genetics, environment, and
stochastic processes (arrow of time). Most research on the aging brain
has used cross sectional designs, although longitudinal investigations
are necessary to uncover more precisely age-related changes in
individuals, and how healthy aging differ from early signs of a
neurodegenerative disease. Such longitudinal studies have demonstrated
large individual differences in subjects between 50 and 80 years of
age. Some older individuals preserve both cognitive performance and
brain structure and function into high age, others demonstrate early
cognitive decline and gross changes in imaging-derived measures, and
there is presently an immense interest to identify contributing
lifestyle and genetic factors in the aging process. This has also
motivated the current study on cognitive aging, brain imaging and
genetics, which started in 2003 as a collaboration between researchers
at the University of Oslo and the University of Bergen. The subjects in
the Bergen cohort have been invited to participate in a baseline and
two follow-up studies, and more than 100 individuals from the Bergen
area have given their informed consent to take part in a comprehensive
neuropsychological examination and structural and functional brain
imaging sessions at three separate occasions about three years apart.
They have also delivered blood samples for DNA analysis.
In this seminar Astri J. Lundervold will present the study design, the
cohort sample, and characteristics of the cognitive data being
collected in the study. Arvid Lundervold will present the MR imaging
part including the multimodal recordings, image processing and data
analysis. Analysis of such heterogeneous cohort data is challenging,
both technically and with respect to mutual understanding across the
disciplines that are involved in the project. Both presenters will give
short examples from the previous and ongoing research and look forward
to interesting discussions and input from the audience.
Additional material:
Flyer,
Astri Lundervold's webpage,
Arvid Lundervold's webpage,
Astri's slides,
Arvid's's slides,
Video
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January 25, 2013
Enlighten: an Interactive Visual Analysis framework - Development and
Use cases
Speaker: Ove Daae Lampe (Research scientist, CMR)
Place: Auditorium, VilVite Science Center
Time: Friday January 25, 2013, from 10.15am to 11.15am
Abstract:
Enlighten is Interactive Visual Analysis framework which can read data
from multiple sources and provide suitable visualizations using an easy
and understandable user interface. Multiple visualizations can be
connected/coordinated using interactive filtering. Enlighten is
implemented using a mix of OpenCL, C++, R and primarily Python in a
modular fashion for extensiblity.
This talk will describe the underlying structure of Enlighten, how to
deal with large datasets in Python and how to seamlessly tie together
multiple paradigms for computation (Python, OpenCL, OpenGL and R).
Additional material:
Flyer,
CMR webpage,
Slides
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VCF seminars in
2017,
2016,
2015,
2014,
2013,
2012,
2011
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