[photo-3d] Re "3d" action freeze (HELP!!!)

[Peter Homer <P.J.Homer@xxxxxxxxxxxxx>]

>If you can get a copy of the Matrix movie on DVD there is an included
>making of the movie segment. They show the similar effect was achieved with
>the required blue screens to hide the cameras from each other as well as the
>several hundred Nikon cameras that were computer controlled to shoot
>a forwards and backwards sequence - pretty cool stuff, now if I only had a
>couple of hundred Nikons lying around!
>
>..dan
I had wondered how they hid the cameras, I have seen examples on TV which
were 180 or even 360 degrees but they were purpose built cameras.
>>
>> In some movies or TV broadcasts (mainly advertisements or cult videos) we
>> can see the action "frozen" while the camera is panning around the scene.
>> It isn't stereoscopy, but the 3d effect is impressive. The effect is
>> obtained by inserting in the movie a sequency (left-to-right or right to
>> left, or both) of still frames from multiple cameras set around the scene.
>> The shutters are fired simultaneously.

I would have though the effect could easily made stereo as well with any
pairs of images from the sequence. One way would be to produce lenticulars
or multiplex holograms from the sequences.

Examples I have seen demonstrated on TV had a fairly conventional cine
camera at  the  end of the banks of cameras and the cine sequence ended
with all the shutters opening to record the "time" slice, Leopards and
Dolphins leaping for instance and then frozen in mid air. A 360 degree
version demonstrated on the Uk Tomorrows World Programme just used pinhole
cameras.

>> Here in Italy I can find cheap IR controlled photo cameras at less than $50
>> each, so may be I can afford some experiments, but I need to know more about
>> this technique.
>> -How is it called in technical jargon?

The term I have heard used is "TIME SLICE"

>> -what is the minimal number of cameras I can use?

A Nimslo would give you four but it would be very short and would not curve
around the subject. David Burder combined Nimslo's to give cameras with up
to 24 lenses for taking lenticulars, they were still all in a line but it
should be possible to have each camera at a slight angle to its neighbours.

>> -where (possibly in the web) can i get  additional info?
>> all help will be very appreciated.
>> Sergio

 P.J.Homer