[hugin-ptx] Re: Any reason to use Enblend over Verdandi?

[Monkey]

Thanks for the info. I wondered if a combination mode could be made, which 
corrects the colours using the Poisson equation (something for me to learn 
about - got any links? Is it a frequency domain thing?), but still uses a 
hard seam to connect the images without trying to blend any features (which 
blend mode appears to do, as I get smears very similar to 
Enblend/Multiblend when I use deliberately misaligned images).

I've been updating Muliblend and while it is faster than both Verdandi and 
Enblend, I haven't yet come up with a reliable way to avoid overblending 
(Enblend uses different numbers of levels for every image, as the overlap 
allows, but as well raising the possibility of inconsistent blending this 
also seems to result in later images being blended more than earlier ones).
On Friday, 22 January 2021 at 15:44:05 UTC T. Modes wrote:

> Hi Monkey,
>
> verdandi has 2 blending modes:
>
> - hard seam: this is the fastest one and relies to 100 % on Hugin 
> photometric optimization. For me this works fine in about 3/4 of the cases. 
> If there are bigger color/exposure differences at the image edges between 
> the images then I use blend seam (or enblend)
> - blend seam: it uses the same seam finder as in the hard seam case. The 
> remaining differences between the images are blended with a Poisson 
> equation solver - something completely different from enblends pyramids 
> approach. This algorithm can also blend away some higher color shifts 
> between images. But it still benefits from Hugin photometric optimization - 
> especially when the photometric optimizer has corrected the vignetting 
> (color and exposure is not so important in this case).
>
> But I got some reports where verdandi blend produced bad results. This 
> happens mostly when using bigger images. This issues are not there when 
> reducing the output size. So it is very difficult to debug in the case. 
> Fixes for this are always welcome ;-)
>
> Because of this issue and for backward compatibility I have hesitated to 
> change the default. But each user can change the default blender in the 
> preferences.
>
> PS: 
> > Hugin may have done in balance the exposure of control points 
>
> The control points are only used for geometric optimization. They have no 
> effect for the photometric optimizer. Here only the current arrangement of 
> the images is used for probing the photometric differences between the 
> images.
>

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Re: [hugin-ptx] An addition for the Hugin Tutorials page

[Donald Johnston]

No. If I'm looking for a tutorial I would look on the index page called 
tutorials. Why would I have to look through all the tutorials to see if they 
might link to another tutorial. Would it be better to have only one link on the 
tutorials page and then have all the other tutorials in a chain?

⁣Don​

On Jan. 22, 2021, 12:06 p.m., at 12:06 p.m., "T. Modes"  
wrote:
>
>
>Donald Johnston schrieb am Freitag, 22. Januar 2021 um 18:40:43 UTC+1:
>
>>  It would be a lot easier for someone to find … I don’t usually think
>of 
>> looking for links inside other tutorials.
>>
>> You want a link to a tutorial, but don't look into tutorials??? So
>it's 
>only about the link and not the content?
>
>-- 
>A list of frequently asked questions is available at:
>http://wiki.panotools.org/Hugin_FAQ
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Re: [hugin-ptx] An addition for the Hugin Tutorials page

[T. Modes]

Donald Johnston schrieb am Freitag, 22. Januar 2021 um 18:40:43 UTC+1:

>  It would be a lot easier for someone to find … I don’t usually think of 
> looking for links inside other tutorials.
>
> You want a link to a tutorial, but don't look into tutorials??? So it's 
only about the link and not the content?

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Re: [hugin-ptx] An addition for the Hugin Tutorials page

[dgjohnston]

That link is at a second level so I’d recommend that the link be on the 
tutorials page. It would be a lot easier for someone to find … I don’t usually 
think of looking for links inside other tutorials.

Thanks
Don J.

> On Jan 22, 2021, at 9:25 AM, T. Modes  wrote:
> 
> Hi,
> 
> this tutorial is already linked in the tutorial "Stitching murals using 
> mosaic mode", Advanced techniques section.
> So not sure if an additional link is needed.
> 
> Donald Johnston schrieb am Montag, 18. Januar 2021 um 23:15:20 UTC+1:
> Could I recommend that the following link on linear panoramas be added to the 
> tutorials page.
> 
> https://panospace.wordpress.com/2010/09/19/linear-panoramas-mosaic-tutorial/ 
> 
> 
> It’s provides an excellent procedure for an advanced mosaic technique for 
> building facades.
> 
> Don J.
> 
> -- 
> A list of frequently asked questions is available at: 
> http://wiki.panotools.org/Hugin_FAQ 
> --- 
> You received this message because you are subscribed to the Google Groups 
> "hugin and other free panoramic software" group.
> To unsubscribe from this group and stop receiving emails from it, send an 
> email to hugin-ptx+unsubscr...@googlegroups.com 
> .
> To view this discussion on the web visit 
> https://groups.google.com/d/msgid/hugin-ptx/c0a4e91a-3a4e-4ff8-baff-91ca78eeca6cn%40googlegroups.com
>  
> .

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[hugin-ptx] Re: Any reason to use Enblend over Verdandi?

[T. Modes]

Hi Monkey,

verdandi has 2 blending modes:

- hard seam: this is the fastest one and relies to 100 % on Hugin 
photometric optimization. For me this works fine in about 3/4 of the cases. 
If there are bigger color/exposure differences at the image edges between 
the images then I use blend seam (or enblend)
- blend seam: it uses the same seam finder as in the hard seam case. The 
remaining differences between the images are blended with a Poisson 
equation solver - something completely different from enblends pyramids 
approach. This algorithm can also blend away some higher color shifts 
between images. But it still benefits from Hugin photometric optimization - 
especially when the photometric optimizer has corrected the vignetting 
(color and exposure is not so important in this case).

But I got some reports where verdandi blend produced bad results. This 
happens mostly when using bigger images. This issues are not there when 
reducing the output size. So it is very difficult to debug in the case. 
Fixes for this are always welcome ;-)

Because of this issue and for backward compatibility I have hesitated to 
change the default. But each user can change the default blender in the 
preferences.

PS: 
> Hugin may have done in balance the exposure of control points 

The control points are only used for geometric optimization. They have no 
effect for the photometric optimizer. Here only the current arrangement of 
the images is used for probing the photometric differences between the 
images.

-- 
A list of frequently asked questions is available at: 
http://wiki.panotools.org/Hugin_FAQ
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[hugin-ptx] Re: An addition for the Hugin Tutorials page

[T. Modes]

Hi,

this tutorial is already linked in the tutorial "Stitching murals using 
mosaic mode", Advanced techniques section.
So not sure if an additional link is needed.

Donald Johnston schrieb am Montag, 18. Januar 2021 um 23:15:20 UTC+1:

> Could I recommend that the following link on linear panoramas be added to 
> the tutorials page.
>
>
> https://panospace.wordpress.com/2010/09/19/linear-panoramas-mosaic-tutorial/
>
> It’s provides an excellent procedure for an advanced mosaic technique for 
> building facades.
>
> Don J.
>

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[hugin-ptx] Re: Changing crop changes stitching success

[T. Modes]

Hi,
talk2...@gmail.com schrieb am Montag, 11. Januar 2021 um 14:17:29 UTC+1:

> Hello - The Assistant created a perfect stitch of 3 photos, but I wanted 
> more than the auto-crop.  However, when I changed the crop size (to 
> anything outside of autocrop) the saved file has stitching errors (eg. a 
> vertical post that is now split into two).  If I go back to the auto-crop 
> and re-export, it's fine.   Any ideas on what is happening here ?  
>

The seam finding algorithm (in enblend) is finding different seams in both 
cases because there are different image information available for the 
algorithm. 
The main problem shown in the example is probably the parallax between the 
different images (you have probably not rotate the camera around the 
non-parallax point). To get a better result mask the pole in one image out, 
so enblend is forced to take the pole only from the other image. (This can 
be done in Edit>Panorama Editor, then go the mask/crop tab and mask the 
pole and stitch again.)

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