Category Archives: work

You have beautiful ize. [Weekly Head Voices #62]

I completely lack the genes that usually cause human males to have a thing for cars, but I do love Top Gear. This trailer for a fictional 60s detective show, made by Jeremy Clarkson, James May and Richard Hammond, encapsulates many of the reasons why:

Moustaches, guns, girls, cars and Hammond karate-chopping the porter at Playboy Club London for absolutely no reason whatsoever at 41 seconds can be nothing but 100% pure AWESOME.

It’s crazily busy at the moment, for a large part due to the extra load of having to teach and revamp, AT THE SAME TIME, the TU Delft’s postgraduate Data Visualization course. I’ve chucked out the written exam and the structured lab work, and exchanged it for paper reading, class discussion and four independent projects, inspired by positive experience with my Medical Visualization Ninja Training Course (third year in the running, Ninjas all over the place!), the postgraduate InfoVis course I gave at Stellenbosch and of course the teaching materials of esteemed colleagues at UBC, Harvard, Berkeley and Stanford. With a bit of luck, we will soon deliver a whole class of new-style DataVis Ninjas.

At a recent conference, I ran into an erudite half-British colleague from the far North, who in a few minutes almost managed to turn my world into rubble. You see, I’ve always proudly promoted the use of the -ise forms of certain words, such as visualise, realise, colonise and so forth, these being examples of British English. (Obviously, I adapt when American English is required.)

It turns out that, as is the case with life in general, it’s unfortunately not as simple as that.

It turns out that many of the -ise words are originally from the Greek or the Latin with “-ize” endings, and therefore the Oxford spelling prefers their use, although it accepts the “-ise” forms as well. On the other hand, the Cambridge University Press, as well as the mainstream media and most of the public in Britain and the former colonies, has a strong preference for the “-ise” forms. Certain other words like for example advertise, advise and surprise always take the “-ise” form in British English.

So now I’m faced with this conundrum. It would otherwise not have been such an issue, but the words “visualise” and “visualisation” come up quite often during my work day. Sticking to “-ise” is easier and still correct when in British English mode, but “-ize” for those few words of Greek  and Latin origin could perhaps be considered more correct, and has the great advantage of allowing me to standardise on “visualize” as the canonical form of that important term. However, then I would run the risk of confusing the “-ize” and the true “-ise” words in Oxford English, potentially leading to painful embarrassment at the many cocktail parties that I frequent.

So you see, the Universe is just full of mysteries. Another mystery that has plagued humankind for decades, is what would happen if Stephen Hawking and Albert Einstein got involved in a rap battle. Well humankind, wonder no more:

Ok kids, thank you for tuning in again. Have a great week, I hope to see you again soon!

Happiness slingshot. [Weekly Head Voices #61]

Make sure you won’t be disturbed for the next 2 minutes and 57 seconds, and then focus your full attention on this marvelous YouTube clip:

Yes people, there are apparently some brilliant human beings, the pinnacle of our society you might say, who took the time to construct a giant slingshot with which they then proceeded to shoot each other through the blue summer sky. This is the sign that we, the human race, must be doing something right.

Because I need all the time that I can get to play may part in being a good human, I will now switch to Bullet Time(tm):

  • IEEE VisWeek 2011, Mind-Blowingly Awesome Visualization Conference, took place in week 43. For the first time in years, I was NOT there. The TNR went and came back inspired. My fearless and revered ex-leader Frits Post received the IEEE VGTC Visualization Career Award, which is yet another official recognition of his awesomeness. I hope he still has some space on the mantelpiece next to the Eurographics Honorary Fellow award.
  • Through the #visweek conference twitter stream and some of the blogging that was going on, I was able to follow the conference at a distance. There was a Blogging about Visualization BoF (birds of a feather, a kind of informal meeting to discuss some topic of interest; also read Dominikus Baur’s blog report), which motivated me to revive the MedVis.org webblog! We even have a twitter account now. If you have even a mild interest in medical visualisation or imaging, please subscribe via email, your RSS reader or the twitter account.
  • This blog won one of Joe’s official SA Blog Awards! Buy me a beer when you see me.
  • A real Italian explained to me that putting sugar in your espresso is entirely acceptable and even desirable. Herewith I’m going to stop feeling ashamed about my sugar-in-espresso habit. I’m not sure what I was thinking that combining two of the best substances known to humans was a sin.
  • After spending some serious quality time with The Email Game, I wrestled both of my overgrown inboxes to the ground. Lessons learnt: 1) Even the thin layer of gamification offered by The Email Game was sufficient to motivate me to start and finish a task I’ve been dreading for weeks. 2) Inbox Zero actually is more important than I’ve recently come to think. The trick is deciding when exactly you’re going to empty it.
  • Here’s a picture of a hedgehog after a bath:

It's a hedgehog. After a bath!

So recently I was having a conversation with someone in a bar. Soon the question came up: What are you striving for in your work?

Imagine my surprise when I didn’t have an answer ready. I was surprised, because I usually spend a significant amount of time on introspection, pondering the usual questions:

  1. What makes me happy?
  2. Why are we here?
  3. What should I strive for?

I mostly have answers to all of these and more, often involving coffee drinking in some form, along with a healthy dose of perspective, and harmony. However, due to general work-related business the past few months, my moments of introspection have been few and far between. As is the case with these types of philosophical guidelines, one does need to spend time regularly pondering them, else they sink quickly deeper below the surface of everyday life.

So I spent some time trying to remember what it was that I was striving for in work. Fortunately, not that far below the surface, I found it again:

Create value.

That’s really all there is, but it works for me.

Rebecca Black is OK! [Weekly Head Voices #56]

Probably the most brainless song on the whole of YouTube must be “Friday” (don’t click that link, please) by Rebecca Black. At one stage, she’s seriously singing about leaving home and going to the bus stop on Friday. As if that’s not mentally taxing enough for her, her friends arrive in a car, and, wait for it, SHE HAS TO DECIDE IN WHICH SEAT TO SIT. Heavens. Talk about broody teenager angst. DANGIT I MISS GRUNGE!

In any case, I was convinced that Rebecca Black was a portent of the end of the world as we know it, probably due to an unstoppable tsunami of vacuous stupidity crashing through the whole of civilization (you have to admit, there are signs. what signs? well mostly politicians and managers). However, due to a recent instance of such blinding brilliance that I had to don my mental steampunk goggles of total darkness (yes, the ones I’ll be wearing to Burning Man when I go there), I have to revise my opinion of Rebecca. You see, her musical atrocity has acted as a catalyst for the creation of the musical masterpiece that is Braaiday! Seat yourself comfortably, and experience it:

Yes? Yes. Hang on while I listen to it one more time. No I don’t need YouTube anymore, the whole thing is engraved in my brain. By the way, September 24 is National Braai day in South Africa. You know what to do…

As if Braaiday wasn’t enough to make my year, TNR, friend and business partner, underwent two significant life events:

  1. He turned a year older.
  2. The day after his birthday (doh), TNR was offered an assistant professorship in our section!

We’ll leave the consequences of life event #1 for a later, more philosophical, occasion. The consequence of #2, together with the fact that we’ve somehow managed to attract a handful of Truly Kickass people (you know who you are, kickass people!), is that there’s now an absolutely fabulous vibe in our research group. I’ve had the privilege of experiencing this specific vibe in other places before. You can’t engineer it, it simply has to happen. The best you can do, is to put the right people together and cross your fingers. When it does decide to appear, it’s epic!

On a different topic: The reason why I’ve been ignoring all of your email the past weeks, and why I generally haven’t even been able to pay attention to the beautiful wooshing sound all of my passing deadlines made as they flew by, is because I was first preparing for and then running, together with a whole team of ninjas, the TU Delft CS first year introductory project. I designed this brand-new module last year, and severely honed it this year. 130+ first years worked together in 26 small groups designing and implementing augmented reality music instruments with real-time video analysis, 3D graphics and sound loop mixing. CACOPHONY with a capital C!

I’ve uploaded to YouTube some video impressions of the top teams demonstrating their projects in the concluding session. Click here to view these and any other clips that other peeps have tagged with “ti100a” (the course code).

OK people. That was it for weeks 35 and 36 (this post was 100% produced within moving trains!), the week 37 blog post will hopefully appear this weekend sometime. I’m still Way Too Busy (do you hear that wooshing sound in the distance too?), but managing to keep myself quite happy by:

  1. ensuring that most of the time I spend, I spend creating value;
  2. ensuring that the people I interact with are primarily of the ass-kicking variety;
  3. making many bullet lists like this one.

See you on the other side!

P.S. Have you heard about batmanning? Apparently it’s the new planking:

Barbarossa Town [Weekly Head Voices #51]

Here’s a photo:

Some train at the Rotterdam Station. I spent lots of time in these the past week.

… and here are four things, most of which happened last week:

  • I was honoured to be invited by the International Research Training Group (IRTG) of the University of Kaiserslautern to visit their institute and give a presentation on medical visualisation (my field of research, for those of you joining very late). Unfortunately, I was only able to stay an evening and a morning, flanked by two 7 hour train rides. In spite of my short stay, the exceptionally friendly Kaiserslautern peeps managed to put together an enjoyable and especially very efficient program with dinner, a morning of research discussion  and of course my talk, which was only 45 minutes over time, and a delectable lunch outside. It was interspersed with questions and discussions, which I do like, and most of the audience managed to stay awake (!), but I still do have to take a more serious look into accurately timing interactive talks like this. Thank you very much IRTG, it was a perfect visit!
  • The Delft – Kaiserslautern trip is just so that taking the train seems to make more sense than flying. The total trip time is greater, but the difference is small enough to be justified by the great deal of work one can do on these long train rides.
  • I tried out T-Mobile’s new pre-paid Internet “abroad” option, called Travel & Surf. One pays EUR 4.95 for 50 MB over 24 hours, or EUR 14.95 for 100 MB (which they call “unlimited”, HAHA) over 7 days. Without this active, my mobile internet works abroad, but in the zone 1 countries (Germany, Norway, etc.) costs me EUR 2 / MB up to a maximum of EUR 60 per month, so it’s definitely nice being able to pre-pay and control the possibly nasty surprises. However, an Android telephone sucks down 50 MB of data without even thinking, unless you remember to deactivate syncing and background data, which does help to quite an extent. This is certainly a good development, but T-Mobile and all other mobile providers are probably still making an absolute killing by acting like it’s really complicated providing internet just over the Dutch border.
  • On the really good news front, Francois Malan’s paper on measuring femoral lesions despite CT metal artifacts has been accepted for publication in Skeletal Radiology! The full citation (so far, it’s online first) is:  Malan DF, Botha CP, Kraaij G, Joemai RM, van der Heide HJ, Nelissen RG, Valstar ER., Measuring femoral lesions despite CT metal artefacts: a cadaveric study, Skeletal Radiology, 2011. Cite it sesame!

Here’s my final thing, a youtube clip that, to my surprise, I don’t think I’ve shown on this blog before. Pay attention, it’s full of braai-related culture and wisdom:

May your week be full of awesome!

EuroVis 2011

I’ve written before about EuroVis, the most important European scientific conference on visualisation. In 2009, it took place in Berlin, in 2010 it was in Bordeaux, and, an a surprise non-twist of alliteration, the 2011 edition was held in Bergen, Norway. With 216 attendees and a practically perfect organization, this year’s edition has been described as the biggest and the best EuroVis ever. In a bid to save some time (I still owe you a mega-edition of the Weekly (actually Monthly) Head Voices), I’m going to give my biased account in bullet-list form:

  • On Tuesday evening, we were welcomed by the very charismatic vice mayor of Bergen in the Tårnsalen of the Lysverket building of the Bergen Art Museum. It seems the photo I took of the inside of the art deco tower, built in 1938, is quite a popular shot. The food was divine, thank you very much.

Art Deco tower from the inside in the Tårnsalen, Lysverket.

  • The next morning, during the conference opening, the following Bergen (rainiest city in Europe) joke was told: A visitor asks a local boy in exasperation “Does it rain like this all the time?” and the little boy answers “I don’t know, I’m only 12 years old!”.
  • The conference keynote was given by Scott McCloud, American cartoonist and comic theorist, on aspects of visual communication. This was most probably the best presentation I’ve ever had the privilege of experiencing. Besides brilliant oratorship, his slides are somehow more a visual stream of consciousness affair than discrete quanta of information. When I grow up, I’m going to present like that.

As per usual, I get to award the Weekly Head Voices Best Paper awards, and they go to the following papers:

  • A Shader Framework for Rapid Prototyping of GPU-Based Volume Rendering by Christian Rieder, Stephan Palmer, Florian Link and Horst K. Hahn. Rieder and his colleagues have constructed a full GPU-based volume rendering pipeline in MeVisLab of which the various shader based components are modifiable at runtime. This means that you can prototype your GPU-based volume rendering ideas in no time flat!
  • Curve Density Estimates by Ove Daae Lampe and Helwig Hauser. Back to basics and really important work on the effective visualisation of complex curves at any resolution, with smooth scaling between levels.
  • A Gradient-Based Comparison Measure for Visual Analysis of Multifield Data by Suthambhara Nagaraj, Vijay Natarajan and Ravi S. Nanjundiah. Another back-to-basics paper in which the authors show how to find the agreement between hundreds of scalar fields and visualise this agreement, thus enabling comparison.

The slightly less prestigious EuroVis 2011 Best Paper awards went to:

  1. Uncertainty-Aware Exploration of Continuous Parameter Spaces Using Multivariate Prediction  by Wolfgang Berger, Harald Piringer, Peter Filzmoser, Eduard Gröller. I was unfortunately in the other session, but was told by numerous colleagues that this was indeed an award-winning presentation as well.
  2. A User Study of Visualization Effectiveness Using EEG and Cognitive Load by Erik Anderson, Kristin Potter, Laura Matzen, Jason Shepherd, Gilbert Preston, Claudio Silva. This was presented in the Evaluation session which I had the privilege of chairing. It is indeed a very compelling idea to measure the effectiveness of a visualisation through cognitive load and this paper documents the first very important steps in this direction.
  3. A Gradient-Based Comparison Measure for Visual Analysis of Multifield Data by Suthambhara Nagaraj, Vijay Natarajan and Ravi S. Nanjundiah. This was also amongst the more prestigious WHV best paper award winners, see above!

The rest of the conference featured the following bullets:

  • During the social event on Thursday evening, Frits Post (my boss), was elevated to the rank of Eurographics Honorary Fellow, recognizing his service to and standing in the visualisation community. Including this newest addition, there are only five (5!) EG Honorary Fellows in the world today. I am very proud!
  • During the first session of the morning after the social event, I had the exquisite privilege of presenting the work of my Brazilian colleagues: Piecewise Laplacian-based Projection for Interactive Data Exploration and Organization by Fernando V. Paulovich, Danilo M. Eler, Jorge Poco, Charl P. Botha, Rosane Minghim, Luis G. Nonato. I really do like presenting at events like these, and it’s been a while. Do read and cite the paper, it documents a practical way of reducing any set of high-dimensional data points to the visual space, and enabling interaction with those points on the visual space!
  • The capstone of the conference was presented by the legendary Prof. E. Gröller, also known by the whole community as Meister. In typical style, the title of his talk was only announced during the talk itself. The title was The Haunted Swamps of Heuristics. In this philosophical and visionary contribution, it was argued that algorithms and parameters are too deeply intertwined to focus only on the former, but that it was more important to study, in detail, the exact behaviour of the latter. More broadly speaking, we need to accept the fact that there is a great deal of uncertainty also in the parameter spaces of our algorithms, but that this uncertainty can and should be dealt with correctly.

That thought-provoking capstone and this blog post will share the same concluding quote:

Doubt is not a pleasant condition, but certainty is absurd. — Voltaire / Gröller

I hope to see you in the comments below! You could also opt to click on my shiny new +1 button, or my slightly older but no less shiny retweet or facebook share buttons.