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Visual Computing Forum


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.

vcf.bergene@google.com  Seminars calendar    VCF on Facebook    Google+

     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


     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


     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


     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


     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


     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!


     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


     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


     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


     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


     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


     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



VCF seminars in 2014, 2013, 2012, 2011


 Last change: Helwig Hauser, 2009-09-22