PanoTools NG:
Re: Re: Sigma 8 F3.5 and its sharpness
Roger D. Williams 2007-May-17 03:58:21
Thank you, Hans. My conclusion from this series of exchanges is that
I do not have either a properly calibrated lens nor a perfectly
optimized panohead! I can follow the logic that perfectly calibrated
lenses would only need two points, but of course hand-hand shots
and (as I said) to a lesser extend unipod shots are still going to
need more control points. This is simply because the shots are NOT
all going to be, after proper warping, goint to be on the same
ideal spherical surface.
I must get around to the former although I have no idea how to do
the latter...
Roger
On Wed, 16 May 2007 18:22:49 +0900, Hans Nyberg <#removed#> wrote:
> --- In #removed#, "Roger D. Williams" <roger@...>
> wrote:
>
>> camera on a unipod, there are up to six degrees of freedom for the
>> relative camera movements between shots. Since it would take at least
>> two points to define each degree of freedom, that makes at least 12
>> points at each seam as an absolute mininum. In view of the warping
>> that is also going on, I would have thought double that to be no more
>> than a safe minimum.
>
> Roger
> With a perfect optimized panohead and your lens calibrated for
> corrections and shift you
> only need 2 control points per pair.
> 1 for the yaw and pitch and 1 for the rotation.
>
> Of course handheld panos is another case.
>
> Here is a test you can see.
>
> 1. http://www.panoramas.dk/panorama/test/PTgui-autocontrolpoints.html
> Stitched with PTGui using auto controlpoints 15 per pair. Manually
> optimized for lens
> corrections and for yaw-pitch and roll.
>
> 2. http://www.panoramas.dk/panorama/test/PTgui-2-controlpoints.html
> Stitched with PTGui using 2 manually controlpoints per pair. Template
> with my standard
> lens correction applied, optimized for only yaw, pitch and roll
>
> Note that this is just a raw stitch.
> If you want to see the final pano optimized with "digital lightning" and
> for color and
> sharpness it is here. First one from Elmelunde
> http://www.panoramas.dk/church-murals/index.html
>
> Hans
> www.panoramas.dk
>
>
>
--
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