PTGui says Control Points are misaligned but they are not
Clive Watkinson
points are misaligned (around the 420 level), yet when I view them on
the control points editor they are perfect?
DennisS
cause an unrealted control point pair to have a large error. Start
looking at other control points. When you find the one that is off
and either correct or delete it, your control point with the error of
420 might also be corrected.
Clive Watkinson
John Houghton
the misalignment reported by PTGui is referring to how well the
features marked by control points are aligned with each other. The 420
means that the relevant features end up 420 pixels apart in the
stitched image instead of being coincident. A large stitching error
will probably be visible in that area. The things to check are listed
in this item on the FAQ page:
http://www.ptgui.com/support.html#4_4
John
Erik Krause
Check the relevant images in Panorama Editor (or even better: Detail
View) Show Seams mode. If they align good most likely your control
points are on a repeating pattern. If they don't align either other
control points prevent their alignment or you didn't allow the optimizer
enough freedom (f.e. if you shot tilted down and don't allow
optimization for pitch.
However, to diagnose your problem you should provide the project file
and smaller versions of the source images somewhere for download.
--
Erik Krause
http://www.erik-krause.de
Clive Watkinson
The final image (to cover the tripod) is the one that's out. I have
created about 30 control points but it still mis-aligns when stitching
and the optimiser reports the control point problem.
The shots were taken using a correctly set up nodal ninja head so
there's no parallax error.
I have also ticked the "viewpoint" box on this image which is taken at
about 45% over the position where the tripod was.
This method has worked fine up until now.
I have now checked all control points and they are 99% accurate.
Any further ideas would be most helpful.
Kind Regards
Clive
On Apr 10, 6:16 pm, Erik Krause <erik.kra...@gmx.de> wrote:
> Am 10.04.2011 14:55, schrieb Clive Watkinson:
>
> > Does anyone have any Ideas why PTGui pro is saying that some control
> > points are misaligned (around the 420 level), yet when I view them
Erik Krause
> I have also ticked the "viewpoint" box on this image which is taken at
> about 45% over the position where the tripod was.
Viewpoint correction can be tricky. Is the ground surface flat? Did you
place control points on ground level details only? Did you place control
points only near the area you want to cover?
Clive Watkinson
That sorted it - I had forgotten that you should only place the
control points on the ground on this image.
It's all sorted now - many thanks for your help
Roger D. Williams
<cwatk...@jcsnell.co.uk> wrote:
> Thanks everyone.
>
> The final image (to cover the tripod) is the one that's out. I have
> created about 30 control points but it still mis-aligns when stitching
> and the optimiser reports the control point problem.
This may already have been answered by someone else, but if you are
taking your nadir shot at an angle and relying on perspective
correction, then all the control points need to be in the horizontal
plane, i.e., none of them must be above the floor/ground. I mention
this because I ran into a similar problem and this was the reason.
Roger W.
>
> The shots were taken using a correctly set up nodal ninja head so
> there's no parallax error.
>
> I have also ticked the "viewpoint" box on this image which is taken at
> about 45% over the position where the tripod was.
>
> This method has worked fine up until now.
>
> I have now checked all control points and they are 99% accurate.
>
> Any further ideas would be most helpful.
>
> Kind Regards
>
> Clive
>
> On Apr 10, 6:16 pm, Erik Krause <erik.kra...@gmx.de> wrote:
>> Am 10.04.2011 14:55, schrieb Clive Watkinson:
>>
>> > Does anyone have any Ideas why PTGui pro is saying that some control
>> > points are misaligned (around the 420 level), yet when I view them
>> > the control points editor they are perfect?
>>
>> Check the relevant images in Panorama Editor (or even better: Detail
>> View) Show Seams mode. If they align good most likely your control
>> points are on a repeating pattern. If they don't align either other
>> control points prevent their alignment or you didn't allow the optimizer
>> enough freedom (f.e. if you shot tilted down and don't allow
>> optimization for pitch.
>>
>> However, to diagnose your problem you should provide the project file
>> and smaller versions of the source images somewhere for download.
>>
>> --
>> Erik Krausehttp://www.erik-krause.de
>
--
Work: www.adex-japan.com
DennisS
the horizontal plane. Anything that is above ground should be masked
out. 30 control points is a bit much.
When I am photographing a panorama, I take the Nadir shot with the
camera on the pano head. This picture will align with all the other
ones since it was taken at the same NPP as the rest of the series. I
mask out the tripod head. After getting a good stitch, I bring in the
Nadir patch, mask out all vertical features and assing control points
between the Nadir and patch shot only. It only takes 5 or so points
to get a good stitch. Sometimes it takes more, it just depends.
Masking out all the areas you do not want PTGui to see helps.
Viewpoint correction really shines when done right.