1,560 frames per second from cheap consumer cameras

B

Barry_Green

Moderator
Interesting little experiment from 4 years ago; some Stanford brainiacs got the idea to try to do ultra-high-speed photography using standard consumer-grade 30fps cameras. They built an array of cameras, and they sync'd 'em so that they'd be an equal distance apart in exposure time, and then they went through and pieced all the individual footage together (trying to compensate for the spatial/geometric differences of having the cameras all located at different physical coordinates).

http://graphics.stanford.edu/papers/highspeedarray/

Here's a balloon popping at 1500+ fps:
http://graphics.stanford.edu/papers/highspeedarray/balloons.mpg
 
alright barry, i guess we'll let it slide just this once... :evil:

...seriously, i actually hadn't seen this clip before, thanks for the link. :thumbsup:
 
Barry_Green said:
I don't have to search, I have every thread memorized.

(not)

Mikko, do you want to do the honors?
Click to expand...

I am not sure. By the sounds of it, this is original. For some reason I have this slight recollection of the balloon thing but I may have seen it somewhere else or maybe it was just mentioned in passing in another thread. At any rate, you win this time Barry. This is obviously not my job, policing double threads, I suppose I should stick to watching out for escalating political conflicts. :grin:
 
Well, I did post some video shot at 10,000fps by Phantom at IBC on here back in September. The footage included a balloon of water bursting.


- Mikko
 
Know we know which are the powers of a supermoderator.....Barry can't be noobed and has the ability to remember every thread in this great forum.......

About high speed videos, they are great, but even using a cluster of consumer grade cameras you need lots of them.
 
Thanks for posting Barry, I'm reading the paper now.. {they didn't do any Tsai calibration (from skim reading), lens distortation and getting all the Intrinsic parameters requires tsai charts}
 
That's so weird you bring this up. I was just googling "super slow motion" and "super high speed video" last night. There's a ton of entertainingly cool stuff that comes up, like the waterballoons popping, and there's one of a waterballoon that falls but doesn't break that's neat as well as it deforms. If you're lucky you'll find the Japanese clip of a bunch of monkeys shooting a katana with a 50 cal machine gun.
 
There are some consumer cameras that shoot 300 FPS: The Casio Exilim EX-F1 and the Samsung SC-HMX20c. The Casio is $999 list and the Samsung is $899 list. The Casio is also able to shoot at 600 FPS and 1200 FPS. Not good for professional work, but a great toy...


Bob Diaz

 
after some reading this is what I've gleaned:

(1) an array of camera's record normally @ 30 FPS, the trick is as I understand it, is to start recording each camera a tiny bit after the other, in one second you get 30 X (52 cameras) = 1560 frames in one second, but each frame is offset by 1/1560 seconds, or 6.4 milliseconds, with an accuracy of 200nanoseconds tolerance.

(2) Because the array is packed as close as possible and the objects recorded at a distance, although each view from the camera is different, the object is planner and due to the geometeric distance the difference can be corrected afterwards so the image looks as if its from one view.

(3) Automatic post cc


(4) Fixing rolling shutter!!! how they did this was, imagine a straight line is seen as a diagnal (distorted under rolling shutter) if we take each line and SHIFT it across at a constant ratio then that line now becomes straight!

These array camera's have other uses, eg Mega Dynamic ranges (by record at different exposures and combining, GigaPixel video!! etc.

Exciting stuff!
 
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