Category Archives: work

Teaching InfoVis in Stellenbosch

In week 40 (that’s Monday October 4 to Friday October 8 for those of you not so much into week numbers) I had the privilege of giving a week-long Information Visualisation course to a group of post-graduate students (a mix of B.A. Honours in either Socio-informatics or in Decision-making and Values Studies) at the Centre for KDD of the University of Stellenbosch in the building previously-known-as “The BJ”.

With this post, I want to summarise, extremely compactly, my impressions:

  • In spite of the odd publication at an InfoVis venue, and in spite of putting significant effort into broadening my horizons also into InfoVis, I’m strictly speaking still a Scientific Visualisation (SciVis) guy. In this context, developing and giving an InfoVis course was a fantastically educational experience. I aspire to be equally fluent in SciVis and InfoVis when I grow up.
  • I designed a course based on a mix of lecturing, paper reading and discussion and hands-on exercises. I can now highly recommend this combination. Next time I will put more effort into involving everyone more actively in the discussion. What also seemed to work well was the course website that students could add their work to during class.
  • I sourced almost all of my material from generous InfoVis colleagues, primarily Dr. Tamara Munzner, but also Dr. John Stasko, Prof.dr. Jarke van Wijk and Dr. Maneesh Agrawala. Thank you!
  • Having spent 7 years at the Stellenbosch Engineering Faculty (1500 guys all wearing t-shirts in jeans; furthermore, social skills are frowned upon) and the past 10 years at the TU Delft, a kind of Ultra-Engineering-Faculty, spending the week at The BJ interacting with socially adept and skilled communicators was a truly interesting experience.
  • I was otherwise also impressed with the level of cooperation between the students and their willingness to work hard (and long).
  • Laptop-use during lectures in a relatively small class: It’s an interesting phenomenon, having to deal with your own little communication backchannel. Banning laptop use is obviously not an option as there are too many possible advantages, but I’m not sure yet what a good solution would be towards making sure that the laptops are being used to augment learning.
  • Most students chose ProtoVis (from a list of 8 possibilities, and they were free to use anything else too) to implement their final mini-projects with. This was probably due to their previous web-programming experience, and also that ProtoVis requires more or less zero setup.

Conclusion: Much learned, hopefully the students did too. :) All in all a positive and energising experience!

An indecent proposal. [Weekly Head Voices #31]

Dear readers,

I would like to introduce you to my new friend:

Pretty Leifheit kitchen timer, ideal for the Pomodoro Technique. Also the first time I use the macro setting on my Canon. Doh.

It is old-fashioned and mechanical. It makes an extremely comforting ticking sound, and then after the 25 minutes of focus-time are over, starts ringing. The ticking is not too loud, and not too soft. The ringing is just the right length. You don’t take my word for it, as I’ve made you a short movie clip:

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Comforting, no?

In spite of a number of deadlines having been successfully met, I’m still in the lamentable situation where every second counts, so I’m going back to bullet mode for the rest of this post:

  • The FNSF and I managed to finish that Indecent Research Proposal and submit it at 11:57 on Wedensday, 3 minutes before the Deadline for Indecent Proposals at the Dutch Science Foundation (NWO). We almost missed the deadline due to the extremely primitive web-submission system in use there. If you happen to be invited to review this proposal, please approve it. You Can Trust Us. :)
  • The real-time collaboration functionality in the new Google Docs was a life-saver during the writing of this proposal. Being able to see FNSF’s cursor move and edits happen in real-time was really great for coordinating. Now if they could only improve: 1) The styling possibilities (there are none at the moment, so you have to manually change typesetting if you don’t agree with their default style) and 2) The PDF export (it inserted page-breaks within tables and generally screwed up. Eventually I exported to MS Word, fixed typesetting and page-breaks there, then exported to PDF); then I would be happy.
  • On Friday I had one of the most hectic oral defences of my life. There’s a high probability I’ll have to try again in a year or two’s time. Or never. I’ll keep you posted. Or not.
  • Partly due to the events of Friday, but also to continuous general self-reflection (read: voices in my head that never sleep), I will gradually revise my publication strategy in the coming years. Bottom-line: I have to focus more on generalising until our applications start looking like pure theory. :)
  • I’m slowly learning how to say no. It’s hard, but at least there is some professional help available:
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In a few weeks, I hope to have the time to write you a proper post. Until that glorious occasion, I’ll do my best to keep you up to date with these healthy and low-fat WHV light editions!

Island Style [Weekly Head Voices #27]

(This post introduces the new Weekly Head Voices Nerd Index, or WHV-NI, a metric by which you can see if you should read a post or not. See this page for an explanation of the WHV-NI. The NI of the first part of this post is 0/5, whilst the NI of the part starting with the accepted paper is 3/5, also due to the extensive Head Voices Review at the end.)

Kids, I’m still here! It just that the holiday season is here, and I’m feeling all strange, but I’m super-busy, mostly because I have to put oodles of time into a cool new augmented reality project for the new computer science first years that will be arriving in the first week of September. There’s also the complicated issue of WHV-regularity vs. worthwhile content: I really like entering your visual cortex on a weekly basis, but I prefer doing so with at least some kernel of information value.

We spent some fantastic quality time, perfectly scheduled right in the middle of the Dutch heat-wave (harr harr), on Texel, beautiful little island on the North Sea. Here it is on the map:


View Larger Map

… and here it is in real life:

One fabulous unit of my genetic offspring running on what appears to be our private beach on the island, but wasn't. It was just that nice.

Here’s a nice path on that same island, just because I hope it makes you all nostalgic and pensive:

This photo makes you feel like you should go somewhere mystical, right? Photos of mysterious paths on islands do have that tendency. Check out those clouds, man...

I can do nothing but very strongly recommend that you visit an island when the weather is perfect.

(WARNING, NERD INDEX 3/5 starts here!)

In other great news, Stef’s paper on example-based exploration of multi-fields was accepted by the journal Computers & Graphics. Get it, read it, CITE IT:

S. Busking, C. P. Botha, and F. H. Post, Example-based interactive illustration of multi-field datasets, Computers & Graphics, 2010.

In spite of the fact that my TPN has not yet been able to deliver that jingle he promised, the Head Voices Review simply has to discuss a number of items that have recently been extensively analysed and, err, reviewed. We make use of the proven HVR classification system:

  • Samsung SyncMaster P2370 23 inch 1920×1080 (HD) screen for my home workstation at € 185 including shipping: AWESOME. Many many pixels. Two browsers adjacent.
  • Philips GoGear Ariaz MP3 player with 8G memory at € 70: MOSTLY AWESOME. I can copy music to AND FROM the player on Linux and Windows, no extra software required. Sound quality great, good in-ears. It’s a shame that the slightest perturbation to the ear-phone plug causes audible disturbance, so no carrying this in your super-tight Mika jeans pockets.
  • Sony PS3 Eye USB camera at € 40: AWESOME. Based on a number of websites, we got this camera at work for doing augmented reality work, and oh my, is it fast! Just to make it an even more attractive deal, the lens is adjustable between 54 and 75 defrees of field of view.
  • Nokia E71 at any price: DIVINELY AWESOME. Many of you know that I love my phone.  We’ve been together for almost two years now, and I thought that I might be falling out of love, until I ordered a new battery. Once again it manages 4 days on a single charge. Other smartphone users come to me with jumper leads when they run out of juice, and then I just smile as I jump-start their pitiful fruit-themed bricks. I have also temporarily stopped lusting after the latest and greatest Android-running keyboard-toting battery-draining super-phones. Together with the battery life, the keyboard makes this e71 the ideal phone for the socially-adept, attractive nerd with stamina. YEAH.

So boys and girls, that’s it for this week’s edition. I have to go jump-start some phones, and also do a bit of work on a slightly longer term blog project that I hope to finish sometime in the next few weeks: It’s a post called “The Human Animal Post” and with it I hope to perturb, ever so gently, some of your brain cells.

VCBM 2010 [Weekly Head Voices #26]

(This post is a slightly longer than average report detailing our trip to the EG VCBM 2010 conference. It’s of course super-entertaining, but if you still do wish to skim through it, I’ve bolded the per-paragraph themes. If you’re not sure what these danged conferences are about, see my recent EuroVis 2010 post for a general introduction.)

Last week, I accompanied Peter Schaafsma (he of the orbital fat mobility paper), Bastijn Vissers and André van Dixhoorn (they of the resting state fMRI brain connectivity paper) to Leipzig, where they had been selected to present their work at the second Eurographics Workshop on Visual Computing for Biology and Medicine (VCBM).

Pretty VCBM logo.

Things got off to a great start when, as we were travelling there by speeding bullet (okay, it was just a brand-new rental Opel, but the Autobahn turns any car into a Speeding Bullet!), we managed to strike, at high speed, a high-quality German plastic bucket that had suddenly appeared right in the middle of the road. After a few more kilometres of noticing that our speeding bullet was not able to pass the very slowly accelerating bullet stage and was making strange disconcerting noises to boot (excuse the automotive pun), we stopped to investigate, noticing to our shock that the bucket, having been very badly burnt, Mustafa-style, was still lodged under the car.

After carefully dislodging the remaining half of the bucket, we were even more shocked to notice that the car was dripping concerning amounts of liquid more or less from the spot where the bucket had been stuck. Further on-site and online investigation by the crew brought to light the following observations: 1) The liquid was not hot, and so probably did not come from the engine. 2) The liquid was tasteless (don’t ask). 3) The air-conditioner had been running all the time, and certainly would have to get rid of water condensate from the cooled air. This latter observation was to us not immediately obvious, but now is, and hopefully to you as well: Automobile air-conditioners often get rid of condensed water through outlets under the car. Phew.

Our speeding bullet tore through the remaining 200 kilometres in record time, where my man Helmut from Vienna and these wonderful brain-boosters were waiting for us on the Nikolaikirchhof:

Leipzig's famous 1 litre brain boosters. Image deliberately deFaced. The arms in the photo might or might not belong to anyone that you know.

The conference kicked off the next morning bright and early with a brilliant keynote by Prof. Anders Ynnerman.  This was related to the great talk he gave in Delft the week before, but even better, as, amongst other things, he had had the Virtual Autopsy multi-touch table shipped all the way to Leipzig to be able to demo live during his presentation. He even managed to undo the evil our projector in Delft had wrought on his laptop’s colour profiles and finally showed his visualisations in their full glory on the projector in the Mediencampus Villa Ida.

The second keynote, given by Dr Roland Bammer, focused on their work on eliminating motion artefacts in brain MRI, both by image post-processing but also, and this is the really cool bit, by mounting a special marker on the forehead of the subject that allows real-time 3D motion tracking and linked real-time low-level correction of the MRI acquisition process. They are currently working hard on getting their tech into users’ hands. Help them by bugging your local Radiology Department about this! :)

The multi-touch virtual autopsy table was available throughout the conference to try out. Two observations: 1. Sometimes the glass surface of the multitouch.fi table is harder to work with than the MS Surface's matt finish. 2. It's hard to use the table in environments with too much lighting.

The rest of the scientific program was perfectly varied, consisting of paper presentations, an invited talks session and a posters session, including a plenary fast-forward where each poster author was given three minutes to promote their work.  What really shone throughout the two days, was the superb organisation in Leipzig: Thanks to Dr Alex Wiebel and colleagues, the conference was a text-book example of conference organisation, with each event occurring at exactly the right time, not a moment too soon or a moment too late.  The Mediencampus Ida Villa was the ideal location for the conference, not in the least due to its air-conditioned auditorium shielding us from the more than 30 degrees Celsius outside temperatures. Another important manifestation of the superb organisation were the magical coffee breaks, always taking place exactly when you needed them, with copious amounts of cookies to boot!

Erik Pernod and Herve Delingette won the VCBM 2010 Best Paper award with their paper titled Interactive real time simulation of cardiac radio-frequency ablation, really great work combining elements of simulation, visualisation and a clear clinical application.  The best paper committee had a relatively easy choice, as the reviews (3 to 4 per submission) were also unanimous about this paper’s ranking. As an added bonus, the work is available within the open-source SOFA framework.

My personal and completely biased Head Voices VCBM 2010 Best Talk Award however, goes to the invited talk by Marc Streit and Alexander Lex on Caleydo: Visual Analysis of Biomolecular Data. The presentation was an extremely entertaining show by two skilled speakers, striking just the right balance between focus and variety as they demonstrated several aspects of their Caleydo visual analysis software.  At several points, for example the explicit visual linking of different heterogeneous data sources (paper here, youtube video here, see here for other publications.), I had the typical reaction to good scientific contributions: Now why didn’t I think of that?!

Three to four of the VCBM 2010 papers (this includes the best paper of course) will soon be selected to submit an extended version to the forthcoming special issue in the Computers and Graphics journal on Visual Computing for Biology and Medicine.  Very importantly: Everyone is welcome to submit an aptly themed paper to this special issue! See the C&G special issue on VCBM call for papers for more information.

On a more personal note: This was the second VCBM workshop, with the first having been held in Delft in 2008, organised by yours truly. It was really great in Leipzig experiencing the growing community around this event and especially connecting with some of my favourite people. I’m greatly looking forward to future VCBM workshops, which makes it doubly cool that  VCBM 2012 will be hosted by Prof. Anders Ynnerman in Linköping (Sweden) and that after that, it will become a yearly phenomenon.

Will you join us?

Sometimes, being in academia rules. [Weekly Head Voices #25]

Kids!  It’s now truly summer over here, which means as much as possible time outside, which means less time available for writing blog posts. However, weeks 24 and 25 of 2010 contained such newsworthy items, that I’m simply forced to trade some sun-light for a bit of TFT exposure. In this post, we talk flowers, PhD defences, scientific talks, funny Js and finally stick figures, so please stick around!

I took this photo of the Oude Kerk in Delft as we were taking a walk with one of our esteemed guests. So it's really relevant to this post, ok?

Last week we had our department’s yearly BBQ at the Blue Lagoon at Scheveningen.  In a not altogether surprising turn of events, I’ve been working at the TU for 10 years, and I now have the bunch of orange flowers to show for it! Time is really fun when you’re having flies.

Five of my MedVis (that’s IN4307; if you’re at the TU, make sure you take this life-changing course! :P ) students presented their final project work. Between the visualisations of coronary stents from optical coherence tomography data, the 3D lung volume reduction surgery (LVRS) planning tool and the real-time X-Ray simulator, I was hugely and pleasantly impressed.  Expect to see a large part of this functionality in a future release of DeVIDE. This was energy-producing event #1 of the past two weeks. Energy-producing event #2 was a M.Sc. defence that I opposed just this past Friday, where the candidate presented and defended, in a highly-entertaining and convincing fashion, his thesis on investigating 3D synthetic aperture radar construction on multi-core architectures.

Energy-producing event #3 was when the now freshly minted Dr Eric Griffith defended his PhD thesis on Visualizing Cumulus Clouds in Virtual Reality in stellar fashion.  Dr Griffith did a superb job of maintaining an eloquent discussion with all 7 of his opponents. The offence of Prof Jos Roerdink (Visualisation, Groningen) also deserves mention: The multi-level questions and typically professorial delivery were most entertaining.

The final energy-producing event that I’m going to mention has been named #4 for mysterious reasons, and, for other reasons that will soon become clear, was for me the most significant. Jorik Blaas, close collaborator and friend for the past seven (7!) years, defended his PhD on the Visual Analysis of Multi-Field Data, on Thursday June 24. To take part in the offence, we were extremely honoured to welcome three luminaries of my research field (that’s Visualisation, for those of you who’ve just joined!): Prof.dr. Jack van Wijk, Prof.dr. Anders Ynnerman and the Viennese-Bergenesque Prof.dr. Helwig Hauser. Having all three of them in Delft was just WOW, you just have to trust me on this. In any case, for the first time at the TU, I was also allowed to take my place in the PhD committee. :)

Of course, Dr Blaas sailed through the defence, his usual understated yet verbally effective hyper-intelligent self. Invited lectures by our guests, much late night discussion on the nature of (visualisation) science and of life in general and finally a PhD party that stress-tested all glandular resilience helped to turn this into one seriously wonderful and life-affirming week. I am thankful to all involved.

In completely unrelated news:

  • Have you ever wondered what that funnily isolated ‘J’ character is doing at the end of sentences in emails?  Well, wonder no more! (5-second-version: it’s supposed to be a smiley, but Outlook on the sending side substitutes it with a character from the Wingdings font that is rendered at the receiving side, if that font is not available, as a ‘J’)
  • My 4-year old daughter recently made a drawing with two stick figures standing next to each other. Not significant as such, but the one stick figure was wearing a bow tie, while the other stick figure had a thought bubble above its head with a bow tie in it.

Thank you for joining me again for this edition of the Weekly Head Voices, and please feel free to kick-off completely unrelated discussions in the comments.  Next week (actually this week, I’m late), four of us will be going to Leipzig for the bi-annual Eurographics workshop on Visual Computing for Biology and Medicine (VCBM), which I’ll probably be reporting on in a future blog post (and hopefully on twitter with hashtag #vcbm2010). Stay tuned for much fun and excitement!