WEBVTT 00:00:00.000 --> 00:00:06.390 align:middle line:90% 00:00:06.390 --> 00:00:06.890 align:middle line:90% OK. 00:00:06.890 --> 00:00:11.210 align:middle line:10% So we are doing a bit of different setups 00:00:11.210 --> 00:00:12.790 align:middle line:10% and different kind of recordings. 00:00:12.790 --> 00:00:16.640 align:middle line:84% And so what kind of recordings are you doing, Laura? 00:00:16.640 --> 00:00:18.950 align:middle line:84% Well, we've just been working on recordings 00:00:18.950 --> 00:00:20.930 align:middle line:90% of the string quartet. 00:00:20.930 --> 00:00:23.540 align:middle line:10% So in this case, we're capturing the motion 00:00:23.540 --> 00:00:26.330 align:middle line:10% both of the musicians, for musicians, 00:00:26.330 --> 00:00:29.690 align:middle line:10% and at this point I was looking at their bow movements. 00:00:29.690 --> 00:00:33.890 align:middle line:84% And sometimes also the movements of their instruments. 00:00:33.890 --> 00:00:37.460 align:middle line:84% So what did you think when you were planning for placing 00:00:37.460 --> 00:00:39.990 align:middle line:90% the cameras in this setting? 00:00:39.990 --> 00:00:40.490 align:middle line:90% Yeah. 00:00:40.490 --> 00:00:43.100 align:middle line:84% It's actually quite a complex setup 00:00:43.100 --> 00:00:44.990 align:middle line:84% with four musicians because well you 00:00:44.990 --> 00:00:47.840 align:middle line:84% have the musicians in their chairs, and their music stands, 00:00:47.840 --> 00:00:48.590 align:middle line:90% and their bows. 00:00:48.590 --> 00:00:51.570 align:middle line:84% And everybody is moving all the time. 00:00:51.570 --> 00:00:55.920 align:middle line:84% So there's a lot of possible sources of occlusion. 00:00:55.920 --> 00:00:56.420 align:middle line:90% Yeah. 00:00:56.420 --> 00:00:58.820 align:middle line:84% So it's likely that the cameras are going to be blocked. 00:00:58.820 --> 00:01:00.195 align:middle line:84% The view of the markers are going 00:01:00.195 --> 00:01:02.750 align:middle line:90% to be blocked at some point. 00:01:02.750 --> 00:01:06.340 align:middle line:84% So you have to very strategically place the cameras 00:01:06.340 --> 00:01:08.510 align:middle line:84% at very different angles to make sure 00:01:08.510 --> 00:01:12.860 align:middle line:84% that you're capturing every part, so capturing all 00:01:12.860 --> 00:01:15.740 align:middle line:84% around the four musicians, but then getting different angles 00:01:15.740 --> 00:01:20.690 align:middle line:84% so that when they move, the view of the markers 00:01:20.690 --> 00:01:23.030 align:middle line:90% will not disappear. 00:01:23.030 --> 00:01:28.250 align:middle line:84% So how many cameras should capture each marker 00:01:28.250 --> 00:01:32.340 align:middle line:84% at each time do you think ideally? 00:01:32.340 --> 00:01:34.070 align:middle line:90% At least two cameras. 00:01:34.070 --> 00:01:37.450 align:middle line:84% But ideally, you would like perhaps three or four, 00:01:37.450 --> 00:01:39.950 align:middle line:84% given that the musicians are going to be moving quite a lot. 00:01:39.950 --> 00:01:41.420 align:middle line:90% Exactly. 00:01:41.420 --> 00:01:44.400 align:middle line:84% And what have you been looking to capture? 00:01:44.400 --> 00:01:44.900 align:middle line:90% Yeah. 00:01:44.900 --> 00:01:49.280 align:middle line:84% So I've been doing recordings of both musicians and dancers. 00:01:49.280 --> 00:01:53.100 align:middle line:84% And my dancers are really moving about. 00:01:53.100 --> 00:01:57.500 align:middle line:84% So first of all, I need quite a large space. 00:01:57.500 --> 00:02:02.480 align:middle line:84% And also, my cameras are placed at different heights. 00:02:02.480 --> 00:02:04.670 align:middle line:84% And also one thing to think about when 00:02:04.670 --> 00:02:09.139 align:middle line:84% you do recordings with dancers is that you have to remember 00:02:09.139 --> 00:02:13.100 align:middle line:84% that they may also move higher than the head 00:02:13.100 --> 00:02:15.140 align:middle line:84% if they have their hands up in the air. 00:02:15.140 --> 00:02:18.350 align:middle line:84% So that is also something that one 00:02:18.350 --> 00:02:21.710 align:middle line:84% have to remember when you place the cameras. 00:02:21.710 --> 00:02:23.630 align:middle line:90% Have you done something similar? 00:02:23.630 --> 00:02:27.080 align:middle line:90% I have with piano duos. 00:02:27.080 --> 00:02:29.900 align:middle line:84% In this case, we had two grand pianos 00:02:29.900 --> 00:02:31.170 align:middle line:90% that were facing each other. 00:02:31.170 --> 00:02:33.170 align:middle line:84% So that the pianists were looking straight 00:02:33.170 --> 00:02:35.520 align:middle line:90% at each other across the two. 00:02:35.520 --> 00:02:37.520 align:middle line:84% So this meant that the two pianists 00:02:37.520 --> 00:02:42.270 align:middle line:84% were the length of two grand pianos apart from each other. 00:02:42.270 --> 00:02:45.170 align:middle line:84% And this is in kind of a constrained space. 00:02:45.170 --> 00:02:49.430 align:middle line:84% So it was necessary to cluster the cameras around the two 00:02:49.430 --> 00:02:52.910 align:middle line:84% musicians, four cameras and four cameras in that case, 00:02:52.910 --> 00:02:56.990 align:middle line:84% and make kind of two sub capture volumes. 00:02:56.990 --> 00:02:57.490 align:middle line:90% Cool. 00:02:57.490 --> 00:03:01.730 align:middle line:90% 00:03:01.730 --> 00:03:05.600 align:middle line:84% So can you tell me why you have used 00:03:05.600 --> 00:03:10.040 align:middle line:90% this particular type of camera? 00:03:10.040 --> 00:03:12.650 align:middle line:84% So the reason why I used, or actually I 00:03:12.650 --> 00:03:14.270 align:middle line:90% used several systems. 00:03:14.270 --> 00:03:19.640 align:middle line:84% But I also used this one for capturing in the field. 00:03:19.640 --> 00:03:22.130 align:middle line:90% Because they are quite small. 00:03:22.130 --> 00:03:27.710 align:middle line:90% And but works very well I think. 00:03:27.710 --> 00:03:30.980 align:middle line:84% And they're light and quite easy to put up. 00:03:30.980 --> 00:03:32.210 align:middle line:90% Yes. 00:03:32.210 --> 00:03:34.670 align:middle line:84% Yes, I've also used these outside of the lab. 00:03:34.670 --> 00:03:37.970 align:middle line:84% And it is quite easy to capture, actually, quite a large area 00:03:37.970 --> 00:03:40.410 align:middle line:90% even if they are very small. 00:03:40.410 --> 00:03:45.320 align:middle line:84% And when you set up your experiments, 00:03:45.320 --> 00:03:48.350 align:middle line:84% do you use this kind of thing, or do you use tripods? 00:03:48.350 --> 00:03:49.400 align:middle line:90% I use both. 00:03:49.400 --> 00:03:53.090 align:middle line:84% But I use tripods as well because in some of the rooms 00:03:53.090 --> 00:03:56.870 align:middle line:84% that I've been, there it's not really, yeah, anything else 00:03:56.870 --> 00:03:59.090 align:middle line:90% to attach them to. 00:03:59.090 --> 00:04:00.620 align:middle line:90% That works well as well. 00:04:00.620 --> 00:04:02.780 align:middle line:84% The only thing that you have to make sure 00:04:02.780 --> 00:04:08.240 align:middle line:84% is that the four is really stable. 00:04:08.240 --> 00:04:10.730 align:middle line:84% Because and also with the dancers, 00:04:10.730 --> 00:04:13.190 align:middle line:84% that the dancers don't come so close. 00:04:13.190 --> 00:04:15.020 align:middle line:84% Because then they can start to move. 00:04:15.020 --> 00:04:16.940 align:middle line:90% And then it doesn't work. 00:04:16.940 --> 00:04:19.640 align:middle line:84% So if there's many people dancing, then the floor moves. 00:04:19.640 --> 00:04:20.540 align:middle line:90% Yeah, sometimes. 00:04:20.540 --> 00:04:24.460 align:middle line:84% So that is something to be aware of if you're using tripods. 00:04:24.460 --> 00:04:33.000 align:middle line:90%