Stitching issues [1 Attachment]

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Stitching issues [1 Attachment]

Lloyd Duffield


Hi i am trying to stitch a few photos together for a landscape however the effects are weird in the centre of each image it is circular / wavey see attached file 

Please can someone advise 

Thanks
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Re: Stitching issues

Sacha Griffin
Bad a b c parameters. "Distortion values"
Zero them back out and set more  manual control points between images that
are high in overlapping details, the right side. Then optimize. The abc
solution you got works because it solves the bet fit for control points
because you dont have enough control point data.
You can also zero out abc and just use b until it looks close and then
optimize a and c. The inner and outer levels of distortion on the lens,

Sacha Griffin
Southern Digital Solutions LLC  - Atlanta, Georgia
http://www.seeit360.com
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On Apr 12, 2014, at 3:13 AM, Lloyd Duffield <[hidden email]>
wrote:


 [Attachment(s) <#TopText> from Lloyd Duffield included below]


Hi i am trying to stitch a few photos together for a landscape however the
effects are weird in the centre of each image it is circular / wavey see
attached file

Please can someone advise

Thanks


   
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Re: Stitching issues

John Houghton
In reply to this post by Lloyd Duffield
I'm sure Sacha is right in saying the fault lies in the lens parameter values.  Be sure to delete all control points that are not assigned on stationary features - i.e. no points on clouds or water.  You need well distributed points for the optimizer to evaluate accurate lens parameters. It might be better to evaluate the lens parameters in a separate project (preferably a full 360 degree panorama) where there are plenty of features for control points.  Then use these parameters in the present project and exclude them from any further optimization.

 John
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Re: Stitching issues

paul womack
[hidden email] wrote:
>
> It might be better to evaluate the lens parameters in a separate project (preferably a full 360 degree panorama) where there are plenty of features for control points.  Then use these parameters in the present
> project and exclude them from any further optimization.

Seconded. It's really easy to do a calibration shot (preferably with more overlap than a "normal" shot), because you can
choose your moment, and your target. "Art" and composition can be ignored in favour of
lots of detail to give good CPs.

Every subsequent pano can be taken quicker and easier, since you *know* you've got a calibrated lens.

   BugBear

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Re: Stitching issues

Mark D. Fink
...with one exception - fisheye lenses. You can't increase your overlap
because that affects the yaw, which, for reasons I still don't understand,
will change your NPP. So, for rectilinear lenses, by all means shoot with
extra overlap and calibrate your lens that way, but with fisheye lenses, you
need to have your calibration set exactly match the way you will be shooting
later on. Or am I completely off base here...?   :o)

Mark

-----Original Message-----
From: [hidden email] [mailto:[hidden email]] On
Behalf Of paul womack
Sent: Tuesday, April 15, 2014 4:16 AM
To: [hidden email]
Subject: Re: [PanoToolsNG] Re: Stitching issues

[hidden email] wrote:
>
> It might be better to evaluate the lens parameters in a separate project
(preferably a full 360 degree panorama) where there are plenty of features
for control points.  Then use these parameters in the present
> project and exclude them from any further optimization.

Seconded. It's really easy to do a calibration shot (preferably with more
overlap than a "normal" shot), because you can
choose your moment, and your target. "Art" and composition can be ignored in
favour of
lots of detail to give good CPs.

Every subsequent pano can be taken quicker and easier, since you *know*
you've got a calibrated lens.

   BugBear



------------------------------------

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Re: Stitching issues

Erik Krause
Administrator
Am 15.04.2014 13:49, schrieb Mark Fink:
> ...with one exception - fisheye lenses. You can't increase your overlap
> because that affects the yaw, which, for reasons I still don't understand,
> will change your NPP. So, for rectilinear lenses, by all means shoot with
> extra overlap and calibrate your lens that way, but with fisheye lenses, you
> need to have your calibration set exactly match the way you will be shooting
> later on. Or am I completely off base here...?   :o)

You are perfectly right. BTW: The NPP shift is simply due to the optical
properties of the lens. If the entrance pupil wouldn't shift, 180°
fisheyes wouldn't be possible (not to speak about something like the
Nikon 5.4mm fisheye with 270° field of view).

If you point the lens with the rear side to a light source and look into
the front lens, you can see the entrance pupil shift.

Or you look at the very nice raytracing diagrams (including animations!)
on http://www.pierretoscani.com/echo_fisheyes_english.html

--
Erik Krause
http://www.erik-krause.de


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Re: Stitching issues

Lloyd Duffield
In reply to this post by Lloyd Duffield
cheers for that will give it a shot over the weekend :)