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+--- Thread: correct curved images of all kind (/Thread-correct-curved-images-of-all-kind)
correct curved images of all kind - denzjos - 09-07-2019
When one make a photo or a copy from a book, mostely the photographed page is curved. This is also the case when one take photo from a bended poster or paper on a wall where the result is mostly a large flat s-formed image. An panorama photo that is taken by a camera can have also an s-curved hurizon. Is there a possibility in Gimp to correct such a disortions? One can use the filters/disort/bend curve, but that is not precise enough. I know there exist a photoshop plugin Altostorm panorama corrector that can do the job by creating on or two curves that can solve this problem but I can't find something like this in Gimp. Any suggestions? Thank you in advance.
RE: correct curved images of all kind - denzjos - 09-08-2019
This link is telling what it is all about :
https://medium.com/tensorflow/how-vflat-used-the-tflite-gpu-delegate-for-real-time-inference-to-scan-books-df3bb86a4eb7
Maybe there is a plugin of this kind for Gimp ?
RE: correct curved images of all kind - rich2005 - 09-08-2019
Nothing even close to that demo. In fact nothing at all that is anywhere close to automatic.
Best I came up with (and I tried a few things yesterday) is the gmic interactive warp filter...but it is what it says, interactive although you can save the settings for use later. (I have a set-up for making gores for a globe)
[attachment=3137]
Better than the photo but less than perfect.
Hopefully someone will come up with a better solution.
RE: correct curved images of all kind - denzjos - 09-09-2019
Rich2005, thank you for the tip, I give it a try. It takes me a lot further. One day I think the Gimp creators have a solution for this, developing it step by step.
RE: correct curved images of all kind - denzjos - 09-09-2019
The gmic warp plugin is very time consuming, but I found something in a forum : https://mail.gnome.org/archives/gimp-user-list/2013-March/msg00120.html . One mentioned there a link to some old plugin but the link is death. Is the plugin still available and for Gimp 20.10.12 (windows 10 / 64 bits) ?
RE: correct curved images of all kind - rich2005 - 09-09-2019
(09-09-2019, 11:10 AM)denzjos Wrote: The gmic warp plugin is very time consuming, but I found something in a forum : https://mail.gnome.org/archives/gimp-user-list/2013-March/msg00120.html . One mentioned there a link to some old plugin but the link is death. Is the plugin still available and for Gimp 20.10.12 (windows 10 / 64 bits) ?
It is one of RobA's old scripts: curve-bend-between-paths.scm You can get it from http://www.silent9.com/incoming/scripts/
About 20 down the list - the date is 2012-08-14
Goes in C:\Users\"yourname"\AppData\Roaming\GIMP\2.10\scripts Find it in Filters -> Distorts -> Distort Correction between Paths
It uses the old Gimp curve-bend tool, not much in the way of how-to's. Two paths required. The script says, each path left to right & not more than 17 control points.
looks like this:
[attachment=3140]
This did crash more times than it worked., very picky.
RE: correct curved images of all kind - denzjos - 09-09-2019
Thank you rich2005, I've used the plugin on a few images and it seems to work without problems.