Peter,
What you are referring to is stroboscopic effect. It is the same
principal as used in a timing light. The camera scans a frame at 30 or
60 times a second. If the wheel spokes are in the same visual position
each frame, they will look like they are standing still. I've seen
movies where the wheels of a car or wagon appear to be turning backward
because of this effect. It does look really strange!
Peace,
Pat
Thusly spake peter harrison:
> Finally have got round to looking at/editing old videos - seem to have got
> used to the software finally.
> Anyhoo, found this clip from last year - the pace of the car just seemed to
> mirror the video capture and the wheels ended up being static, so that the car
> looks like it is sliding (as it might do on ice) - i'm sure that there is a
> technical reason for it - but it is interesting
>
> check out spl311u on youtube.
>
> Peter
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--
Pat Horne, Owner, Horne Systems
(512) 797-7501 Voice 5026 FM 2001
Pat@HorneSystemsTx.com Lockhart, TX 78644-4443
www.hornesystemstx.com
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