PanoTools mailing list archive

Mailinglist:PanoTools NG
Sender:Nils Holmberg nils.holmberg@... [PanoToolsNG]
Date/Time:21-Apr-2020 11:55:45 +0000
Subject:Re: Re: stitch overlapping screenshots

Thread:


Hi again, thank you for relevant info, and apologies for late reply. I get the point that panotools was not originally designed for the simpler mosaic use case. Unfortunately, my application environment does not provide the PTGUI to perform these settings:
- Go to the Lens Settings tab and set the Lens type to Rectilinear. Set the Focal Length to a high value (e.g. 1000mm).
- In the Control Points menu choose 'Generate Control Points'
- Go to the Optimizer tab. Deselect the 'Optimize lens focal length' checkbox. At 'Minimize lens distortion', choose 'Heavy'.
So using the bash commands from the wiki (https://wiki.panotools.org/Panorama_scripting_in_a_nutshell#Example_work...), would it be possible for you to indicate where and how the commands would need to modified to reflect the PTGUI settings above?

# install dependencies#sudo apt install hugin-tools enblend
# convert screen recording to framesffmpeg -i vid/fb.mp4 -vf fps=2 img/frame-%04d.png
# rotate images for panorama row
mogrify -rotate -90 img/frame-00* 
# hugin project, page 7 in tmp/moz.pdf
pto_gen -o tmp/project.pto img/*.png
# find control points
cpfind -o tmp/project.pto tmp/project.pto
# clean control points
cpclean -o tmp/project.pto tmp/project.pto
# find vertical lines
linefind -o tmp/project.pto tmp/project.pto
# position, photometric optimization
autooptimiser -a -m -l -s -o tmp/project.pto tmp/project.pto
# calculate optimal crop, size
pano_modify --canvas=AUTO --crop=AUTO -o tmp/project.pto tmp/project.pto
# create output
hugin_executor --stitching --prefix=fb- tmp/project.pto
# remap, render images
nona -m TIFF_m -o tmp/fb- tmp/project.pto
# blend remapped images
enblend -o img/project.tif tmp/fb-00*.tif
# remove overlapping images
rm tmp/fb-0000.tif 
enblend -o img/project.tif tmp/fb-00*.tif
# no working result
Best wishesNils


#removed#
 

    On Wednesday, April 1, 2020, 10:27:15 AM GMT+2, Erik Krause #removed# [PanoToolsNG] <#removed#> wrote:  
 
     
Am 01.04.2020 um 08:06 schrieb Nils Holmberg:

> Hi, I'm wondering if panotools can be used to stitch multiple images
> with overlapping identical pixels, e.g. screenshots? The question is
> explained in this stack overflow post: Stitch together images with
> exactly matching (pixel to pixel) overlaps

Yes, could work. Since the images don't have any perspective distortion
this is the same situation like for scanned images are a long mural shot
from different viewpoints. This is called orthographic projection. You
would need to choose a very long focal length to simulate orthographic
projection and set control points on identical features between images.
Overlap should be more than only a few pixels for this to work.

Please note that current GUIs have extended old original panotools to
allow the direct use of multi-viewpoint images. In Hugin this is called
Mosaic Mode, in PTGui Viewpoint Correction.

See: https://wiki.panotools.org/Stitching_a_photo-mosaic or
https://www.ptgui.com/support.html#6_5

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

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