Author Topic: 3 & 4 diabolo in slow motion 3000FPS by Ofek Shilton  (Read 8065 times)

Ofek Shilton

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3 & 4 diabolo in slow motion 3000FPS by Ofek Shilton
« on: April 04, 2011, 12:05:41 am »
Hi all! long time no see..

i film some 3 & 4 diabolo juggling in slow motion (3000FPS) with the fastest high-speed camera in the world (Phantom V12, cost about 250,000$, not mine...  8) )

it's the first time we can see the smallest movements of the diabolo.. i think this is so COOOOOOOOL!

Enjoy!
Ofek Shilton





Hack

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Re: 3 & 4 diabolo in slow motion 3000FPS by Ofek Shilton
« Reply #1 on: April 04, 2011, 03:34:53 am »
Wow. That is amazing. For real, that is super cool.

Ben.

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Re: 3 & 4 diabolo in slow motion 3000FPS by Ofek Shilton
« Reply #2 on: April 04, 2011, 05:13:12 pm »
can you use this to work out how fast the diabolos are spinning?

Mark BMC

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Re: 3 & 4 diabolo in slow motion 3000FPS by Ofek Shilton
« Reply #3 on: April 04, 2011, 05:59:54 pm »
prity prity prity good!

angela945

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Re: 3 & 4 diabolo in slow motion 3000FPS by Ofek Shilton
« Reply #4 on: April 04, 2011, 06:16:38 pm »
Soooo cool, beatiful!!
Diabolo with Taibolo , Diabolo with MHD

Arthur

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Re: 3 & 4 diabolo in slow motion 3000FPS by Ofek Shilton
« Reply #5 on: April 04, 2011, 06:36:18 pm »
can you use this to work out how fast the diabolos are spinning?

Yes. If you compare the slowmotion version (not with the continuous speed change this video uses) with the real speed, you can calculate how fast it is going.
You can say that the FPS ratio is the frequency. Using Time=1/frequency as formula you can say the following:
If you devide "the amount of frames a certain action took (the "1" in the formula)" by the frequency, you get the "real-time" time it took to preform the action. So if this video is running at 500* FPS, and it takes 5 frames to complete 1 circle, that means that it takes 5 x 1/500= 5/500 = 0.01 second for a complete circle.

*500 for the sake of argument, it's not 3000FPS all the time. It doesn't matter actually. 5 frames at 500FPS is the same as 30 frames at 3000FPS

Now thats just the time, and not the speed  :)
The diameter of my Circus (I don't have a Finesse) is 13 cm (0.13 meter). Pi x diameter = outline, so 3.14 x 0.13 = 0.41 meter around.
So it takes 0.01 second to move 0.41 meter, so 0.41/0.01 = 40.8 m/s.
If you multiply the speed (40.8 m/s) by 3.6, you get the speed in km/h (40.8 x 3.6 = 147 km/h. This seems a little high, so that means the numbers I used suck. Count for yourself if you want a better answer)

Note: You would have to count the exact amount of frames it takes to preform the action, and you have to know at what FPS you're watching frame-by-frame.

God I realy no-lifed this :P

Toby

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Re: 3 & 4 diabolo in slow motion 3000FPS by Ofek Shilton
« Reply #6 on: April 04, 2011, 07:02:01 pm »
be a lot less complicated to just put a little mark on the rim of the diabolo. take, lets say 4 seconds of footage. slow it down, count how many times the mark goes round in that time and then just use speed = distance/time. using the circumference*the amount of times the diabolo revolves....

Arthur

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Re: 3 & 4 diabolo in slow motion 3000FPS by Ofek Shilton
« Reply #7 on: April 04, 2011, 07:12:21 pm »
be a lot less complicated to just put a little mark on the rim of the diabolo. take, lets say 4 seconds of footage. slow it down, count how many times the mark goes round in that time and then just use speed = distance/time. using the circumference*the amount of times the diabolo revolves....
True, but what is "time" in your formula? 4 seconds? I think not. Doing what you do gives you relative speed. not the real speed

D-Man

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Re: 3 & 4 diabolo in slow motion 3000FPS by Ofek Shilton
« Reply #8 on: April 04, 2011, 07:51:29 pm »
Wow - Can you do my Math degree whilst i play with my diabolo?

Thanks.

maxmaestro

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Re: 3 & 4 diabolo in slow motion 3000FPS by Ofek Shilton
« Reply #9 on: April 04, 2011, 08:02:26 pm »
Wow - Can you do my Math degree whilst i play with my diabolo?

Thanks.

sign me up too :P

Arthur

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Re: 3 & 4 diabolo in slow motion 3000FPS by Ofek Shilton
« Reply #10 on: April 04, 2011, 08:08:19 pm »
Sorry guys :P
I was just bored

Ben.

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Re: 3 & 4 diabolo in slow motion 3000FPS by Ofek Shilton
« Reply #11 on: April 04, 2011, 08:17:20 pm »
be a lot less complicated to just put a little mark on the rim of the diabolo. take, lets say 4 seconds of footage. slow it down, count how many times the mark goes round in that time and then just use speed = distance/time. using the circumference*the amount of times the diabolo revolves....
Thats what I was getting at, and then because we know how slowed down the footage is we can multiply it back to normal speed.
would this not work?

Toby

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Re: 3 & 4 diabolo in slow motion 3000FPS by Ofek Shilton
« Reply #12 on: April 04, 2011, 08:48:50 pm »
True, but what is "time" in your formula? 4 seconds? I think not. Doing what you do gives you relative speed. not the real speed

Be good enough for what ben was angling at. Obviously not 4 seconds no, that was just a rough example to aid my explination, which I think it did as ben seems pretty chuffed with my response (potentially erect)

Arthur

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Re: 3 & 4 diabolo in slow motion 3000FPS by Ofek Shilton
« Reply #13 on: April 04, 2011, 09:07:20 pm »
Thats what I was getting at, and then because we know how slowed down the footage is we can multiply it back to normal speed.
would this not work?
Ah, i think i get the misunderstaning :)
If you take 4 seconds of footage from the video at the origional speed, than slow it down to watch and count, and speed it up again it would work. I assumed you'd take 4 seconds from the slowmo version posted by Ofek.
Then still; we don't know the answer because we simply don't know what real time is in ofek's video.

Toby

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Re: 3 & 4 diabolo in slow motion 3000FPS by Ofek Shilton
« Reply #14 on: April 04, 2011, 09:32:23 pm »
No, that was a problem I considered....was more of a theory then something actually applicable to the video. There isnt an obviously mark on the diabolo's anyway...

Arthur

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Re: 3 & 4 diabolo in slow motion 3000FPS by Ofek Shilton
« Reply #15 on: April 04, 2011, 09:38:07 pm »
Guess ill change my answer to Ben  :P

can you use this to work out how fast the diabolos are spinning?

Nope. Not enough data.

Toby

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Re: 3 & 4 diabolo in slow motion 3000FPS by Ofek Shilton
« Reply #16 on: April 04, 2011, 09:44:11 pm »
Also, if you look here and click on specifications. http://www.visionresearch.com/Products/High-Speed-Cameras/v121/ You can see in the top left of the info the different settings...so its not going to be exactly 3000fps judging by the data there.

Ben.

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Re: 3 & 4 diabolo in slow motion 3000FPS by Ofek Shilton
« Reply #17 on: April 04, 2011, 09:48:08 pm »
I was asking whether you could use this camera to work out the speed of the diabolo, not just this video.
Supposing you had a mark on the diabolo, you slowed down the video, counted how long it took the diabolo to spin say 10 times and then worked out by how long you slowed the video down by then you could work out how fast it was spinning.

Toby

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Re: 3 & 4 diabolo in slow motion 3000FPS by Ofek Shilton
« Reply #18 on: April 04, 2011, 09:49:45 pm »
yes

Arthur

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Re: 3 & 4 diabolo in slow motion 3000FPS by Ofek Shilton
« Reply #19 on: April 04, 2011, 10:09:18 pm »
I was asking whether you could use this camera to work out the speed of the diabolo, not just this video.
Supposing you had a mark on the diabolo, you slowed down the video, counted how long it took the diabolo to spin say 10 times and then worked out by how long you slowed the video down by then you could work out how fast it was spinning.

I expect that it is possible with a regular camera. As long as you don't spin the diabolo too fast :)