[Bf-vfx] Footage for Tracking

[François T.]

I'll do all that on saturday with D90.

cheers
F.

2011/6/8 Keir Mierle <mierle at gmail.com>

> A catalog of the following shots would be useful:
>
>    - General motion: Moving and rotating camera. Camera is /not/ always
>    pointing at one part of the scene.
>    - Rotation only: camera on a tripod, rotating around a fixed point (if
>    possible the camera's "Nodal point", but you need a special tripod for that)
>    - Translation only: walking sideways keeping the camera pointed forward
>    (e.g. not circling)
>    - Translation only: walking towards the scene
>    - General motion when the scene is planar (e.g. camera keeps a big
>    billboard in view and only the billboard)
>    - Circle strafing around an object; camera is fixated on one part of
>    the scene (intersecting principal ray)
>
> The scenes should have good texture so that tracking is easy; we can add
> challenging scenes later. It's ok if the translation-only scenes have some
> hand held wobble; that's fine. Boxes with texture are good. Complicated
> objects like bushes or trees are bad. The scene must be static (no cars,
> people, birds, godzilla, etc).
>
> The camera must be calibrated. There is a libmv calibration target that you
> can affix to a really flat object. The calibration target must be really
> flat; something that has a bit of bend is unacceptable and will give poor
> results.
>
> http://libmv.googlecode.com/svn/trunk/extras/calibration/calibration.pdf
>
> Take several images of the calibration target (or a video in HD). Get
> different rotations and fill the frame to get the edges (important for
> distortion correction). Then run one of the calibration tools to find the
> intrinsic parameters (focal length in pixels, distortion, skew, etc).
>
> Note: Rolling shutter is *horrible* for tracking. We're going to have to
> handle it at some point, but I am trying to avoid it as long as possible. Do
> you have access to a CCD style camera without a rolling shutter?
>
> Keir
>
> On Tue, Jun 7, 2011 at 3:27 PM, Ian Hubert <ian at projectlondonmovie.com>wrote:
>
>> Hey all!
>>
>> I've been following the conversations, and wanted to throw out that if
>> anyone needs any sort of footage, I can run out and film stuff. I already
>> have a few things things filmed- mostly just walking around the city holding
>> the camera as steady as I can- but if anyone wants anything else
>> (underexposed, really shaky, steady smooth, panning--but-no-movement,
>> somebody walking across the frame, stuff like that), just say so!
>>
>> At this point all I can quickly provide is SD and HD-
>> I unfortunately don't have access to a 4k camera, but I'll film some random
>> stuff if I ever get my hands on one.
>>
>> --
>> Ian Hubert
>>
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>>
>
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-- 
____________________
François Tarlier
www.francois-tarlier.com
www.linkedin.com/in/francoistarlier
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