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Okay, Laura. We are now at Week 3 of the Motion Capture course. For this week's wrap-up video, 

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I thought we should pick up on a couple of questions that you have asked in the discussions.

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Some of you think that it takes a lot of time to set up for an 

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infrared motion, capture session, setting up the cameras calibrating, putting on markers, etc.

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What's the truth Laura? Does it take a lot of time? 
 
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Well, it can take a lot of time, at the beginning. 

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Once you have your setup established, and you have a procedure down, then it's a lot faster.

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So it is possible to get everything calibrated and everybody covered with markers in just a few minutes,

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even if you have several people that are going to be tested.  

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But it takes preparation before the experiment. So how do you prepare? 

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You've done a lot of motion capture, do you have any techniques for planning these things beforehand?

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Well, this has to go on before you start running the experiments where you do a lot of 

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testing of the angles of the cameras and where you're going to place the markers, and expecting that 

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if you ask a person to be in a certain location relative to the cameras, they could end up moving 

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around a little bit. So this can take some hours or some days to test to make sure that your setup 

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is good for what you want to capture.

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And once you have that in place,

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the first couple of sessions, where you have people coming in, are a little bit slower.

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And then some people also asked about particular equipment to use. 

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Here at RITMO, we work with many different types of equipment and also from 

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different companies. So, I guess we wouldn't really recommend anything in particular, but if 

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you're thinking the type of equipment and the cost. 

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You have been working with many different types of systems. What is your 

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general thinking about this? 

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Well, the differences between the very high-end systems and the medium-end systems, 

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if you consider something like Qualisys to be high-end and Optitrack to be middle-end...  

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There are differences but they both capture very, very well. It's not that you're going to get bad 

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data if you choose any of these commercial systems. The differences are more in 

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the precision that you can get at the extremes. So if you're testing in an extreme case like 

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if you want to capture pianists' fingers, so you need a very high frame rate, maybe the lower-end system 

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doesn't get up to the frame rate that you need necessarily. 

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But the lower-cost systems also have their benefits. The cameras are smaller, so they're portable.

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So it's not really... it really depends on what you want to do, I guess.

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In terms of the quality and also the size. Working with a high-end system doesn't 

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necessarily give you good quality data either. A lot of other 

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things also come into play here. 

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Well, I think that's it for this week. Please continue to ask questions and 

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comment and also support each other. It's very nice to see when you reply to each other and 

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share knowledge. That's also part of this course. Then we together can build 

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up community knowledge about these systems. 

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Thanks for now and see you again next week.