to be very, very difficult. There are almost no images on the web of duck weights, at least none that are Creative Commons that I could use, but I found one manufacturer in the United States who still produces these, and I ordered a set of them. [laughs] They took several weeks to arrive, and then I had to find the right thickness of wood strips, so I probably went through 20 or 30 different wood strips from Amazon and Home Depot. I finally got the thickness of the wood that I could approximate this whole thing and so it took me months to create what turned out to be a 20-second segment of the spline video. [laughs] Do you still have them? I still have them. Here’s one! What else should our readers know? Everyone always asks me: Can you really learn an hour’s worth of material in five minutes? I did a formal user study to prove that you can. I taught the computer graphics class at the University of Washington and divided the class into two groups, A and B. Group A watched these five-minute videos, and group B, I gave traditional lectures with PowerPoint but covering exactly the same material – literally the same slides and visuals in the videos as in the lectures. The lectures did take an hour for each five-minute video. Then, I repeated this process twice, so each group got to see lectures for half the time and videos for the other, and I asked the students which they preferred. Two-thirds of them preferred the videos, the shorter format. Then I also compared performance on exams, homework and projects, and there was no correlation, which means that the students who learn from the short videos learn just as well as the ones who learn from the lectures! 17 Computer Vision News Computer Vision News Steve Seitz How the duck weight is used to create curves
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