I hit this recently. Running clean control points again in Hugin fixed it.
I tried the Hugin built-in blender; instead of a smooth blend, it
produced areas of little square tiles (each a solid color) instead. So I
went back to enblend.
I also think alignment might be sensitive to the presence of unnecessary
images. Say one in the middle somewhere that is completely covered by
other images.
I'm also starting to wonder about the Hugin PTO Generator option (select
images, right click, open with Hugin PTO Generator). Opening the
resulting PTO file in Hugin and making a panorama (using either my usual
step-by-step process, or using the Assistant) from it sometimes just
produces panoramas with weird curves, misaligned frames, etc. If I close
the PTO, start a new project in Hugin, drag-and-drop the same images
into Hugin, then make my panorama either way - it comes out fine.
Just thoughts and ideas.
On 11/16/23 07:50, Claudio Rocha wrote:
When I've run into this issue in the past, the only solution I've
found is to re-arrange the order of the images, or to eliminate images
that have too many redundant control points (or completely overlap
other images)
On Thursday, November 16, 2023 at 4:15:01 AM UTC-6 [email protected]
wrote:
Hi Robert,
On 14/11/2023 21:00, Robert Mahar wrote:
> Yeah, thats whats forcing me to stick with enblend and "jiggle the
> handle" till the black tiles go away. This 240 tile project
gives 1 - 4
> black areas every stitch if the images are in order ( right to
left /
> top to bottom ). I was going to dig into this, but I've always
had
> issues building enblend from source owing to vigra, but I guess
I need
> to figure that out to look under the hood. FWIW I do see this
issue
> when there is a regular overlap in the shooting pattern as there
is in
> this project. Unfortunately the tool I'm working on as a
substitute for
> cpfind needs the order of the images to be preserved at the
moment -
> once thats fixed somehow then I can permute the image order and
sidestep
> this.
I am not sure how helpful my suggestions here are going to be, but
from
my experience over the past month (doing the same but for photos
microfiche), I can maybe suggest a few things for this:
1. For blending, give multiblend [1] at try if you haven't
already. I've
had some problems with enblend producing some odd artifacts at
time. I
am not confident enough to say it was really an enblend problem
(and not
my project variables / control points at the time), but I
appreciate the
speed and reproducibility of multiblend.
2. For control point finding, you said you use a custom one. I also
ended up writing my custom control pointer (ORB based) finder and
I was
having problems with visible seams until I realized my control points
weren't actually fitted properly with RANSAC - I wasn't accounting
for
rotation in between my images (I expected there to be none). I'm not
saying the problems you're having are because you use a custom
control
point finder, but it might be worth ruling that out by just using
cpfind
with --multirow
2b. Related to control point finding, I don't know what is the reason
for not using cpfind, but if the reason is performance, then this
might
help. If you make a template and apply it using pto_template, you can
use cpfind --prealigned and have cpfind 'do the right thing', so it
won't do excessive matching that you might be trying to avoid. At
least,
I've understood this should do the trick at being more efficient.
(Please let me know if you figure this out (it's probably not too
hard,
but I didn't try yet)
3. Maybe just open the project file in Hugin and see if the control
points are really all correct/align for the individual images.
Regards,
Merlijn
[1] https://horman.net/multiblend/
> On Monday, November 13, 2023 at 10:21:02 AM UTC-5
[email protected] wrote:
>
> The black shadows are an enblend bug, they don't appear if you use
> the built-in Hugin blender (which is not as sophisticated as
> enblend, but is more stable) - Bruno
--
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