G'MIC 3.2.4 - fx_superpixels (problem)

samj · May 17, 2023, 4:19pm

Bonjour,

There is a problem with the ‘fx_superpixels’ command in G’MIC 3.2.4 (Windows and Linux) .
This command works with G’MIC 3.2.3 but not (or very slow) with G’MIC 3.2.4.

For example :

gmic sp colorful tic fx_superpixels 16,10,5,1,1,0,0,0,255,0,50,50 toc

Merci :o)

David_Tschumperle · May 17, 2023, 4:36pm

Is it better with

?

samj · May 17, 2023, 7:01pm

@David_Tschumperle

I applied this modification and compiled G’MIC 3.2.4
There is no significant difference between the 2 versions :o(

Merci :o)

The test:

gmic sp colorful resize 200,200 tic fx_superpixels_preview 16,10,5,1,1,0,0,0,255,0,50,50 toc

samj · May 17, 2023, 11:48pm

@David_Tschumperle

Bonjour,

I did a few tests and the problem seems to be the new version of CImg.h
The operation is normal and fast with the G’MIC 3.2.3 version modified for G’MIC 3.2.4
I attach the executable ‘gmic.exe’ compiled with this modification for Win 64bit (gmic.7z).

gmic.7z (2.2 MB)

David_Tschumperle · May 18, 2023, 4:30am

Hello @samj ,
I confirm there is a speed issue also for me with this command.
Unfortunately, I have very few time to spend right now trying to find what modification is responsible for the slowness. Would you agree to help ?
I’d be particularly interested by the commit number in CImg or G’MIC code where the problem starts to appear!
Thanks a lot!

David_Tschumperle · May 18, 2023, 4:51am

Well, I found this one:

It seems that the recent changes in the way the norm() function is implemented in the math parser is responsible for the slowness. Could you confirm?
Still investigating…