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• ## Re: Action spherical stereo panoramas with video DSLRs

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• Hello Peter, Your idea to stitch without optimizing the yaw will work, all you need is a precise rotation and interval. I have a question, could you try (or
Message 1 of 81 , Apr 8, 2010
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Hello Peter,

Your idea to stitch without optimizing the yaw will work, all you need is a
precise rotation and interval.

I have a question, could you try (or perhaps you already tried) to stitch
the video frames without any optimizing and warping at all ?
So just taking out small strips of 2 px width of the middle of each fisheye
video frame and then connect them together ?

The unwarped 2 px width strips should be almost similar (*) to the warped
equirectangular version so the connected result should be almost equal.
If this is true then this would simplify the stitching procedure a lot.

(*) when taking 1 px out of the exact optical center of the fisheye image
there is no difference at all with an equirectangular and I think 2 px will
also do fine but this has to be tested.

Wim

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• ... The math above about the number of images needed when using a one camera 3D system is ok but I made a typo in the formula, it should be: Number of images
Message 81 of 81 , May 4, 2010
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Wim Koornneef wrote:
> ....When I thought about the issue this formula to calculate the number of
> images that are needed popped up (*):
>
> A-reference number of images for a shoot in NPP=4
> B-reference forward shift out of NPP (cm)=1
> C-reference number of pixels of stitched pano (mpx)=20
>
> Number of images needed: A x (B + forward shift out of NPP) x C / size of
> stitched pano
>
> (*) I made the formula based on some educated guesses about the relations
> between the parameters so for sure it is not based on any real science...
>
> I my case I should have shot at least: 4x(8+1)x26/20= ~ 47 images instead
> of 31.
> For a larger output f.e. 10.000x5000 px (50mpx) I would need 90 images to
> get a good result......

The math above about the number of images needed when using a one camera 3D
system is ok but I made a typo in the formula, it should be:

Number of images needed: A x (B + forward shift out of NPP) x size of
stitched pano / C

Wim
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