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Jul
7
awarded  Popular Question
Oct
11
awarded  Teacher
Oct
8
answered Cheap solution for shooting with multiple (>2) cameras in sync (genlock or LANC?)
Oct
8
comment Cheap solution for shooting with multiple (>2) cameras in sync (genlock or LANC?)
Right, and that's why the low resolution cameras tend to be terrible quality too at high frame rates. Although videoing fire does mean that you get quite a lot of light! We investigated software compensation, and that creates more headaches than it solves in this case. I am looking for 'ground truth', these are going to be used for reconstructions and motion artefacts are going to cause massive problems, even ignoring the fact that it would undermine the claim of being from real data. Also, research done into flames in particular has shown it is nearly impossible to interpolate frames.
Oct
8
comment Cheap solution for shooting with multiple (>2) cameras in sync (genlock or LANC?)
A high framerate is definitely preferable, the resolution isn't a big issue at all (although a lot of high framerate low resolution cameras also tend to have terrible image quality). But I was told by previous researchers (whose work I am working from) that wire synchronisation is necessary for their system. To emulate that just with a high framerate, I would need over 1000 FPS. Maybe I could get away with less, but really I posted the question because of lack of understanding of hardware synchronisation methods. We already have an LED device as you suggest. But thank you for the answer!
Oct
4
comment Cheap solution for shooting with multiple (>2) cameras in sync (genlock or LANC?)
Ideally I'd love to be able to rent such things, but again cost is prohibitive. Nothing consumer-level (that I've found) has genlock, even the high fps cameras. And even 'high fps' is still nowhere near high enough to give genlock-like synchronisation with just a clapperboard. I still find it really hard to even track down whether a camera has genlock or not, it seems like an industry understood thing, which I'm completely oblivious to. Anyway thanks for replying to such an old thread :).
May
17
comment Cheap solution for shooting with multiple (>2) cameras in sync (genlock or LANC?)
The issue isn't drift, but rather millisecond differences between the cameras that happen at startup. e.g. even assuming I'm shooting both cameras at 60fps, that means there's ~16ms between "shots" in the video. In the worst case, two cameras could be 8ms out and this would be totally uncorrectable in post, it's only possible to move one frame "left or right" without interpolating/faking a higher fps, and one frame is a movement of 16ms, so you go from being 8ms behind to 8ms in front. For a lot of subjects this is probably no problem, but unfortunately not flickering flames! Thanks anyway.
May
14
awarded  Student
May
14
asked Cheap solution for shooting with multiple (>2) cameras in sync (genlock or LANC?)