Dear Vittorio, This is pretty weird… you could in principle fix this by running fspython -m pip install opencv-python but the error is probably sign of a wider problem so you’re probably better off installing the latest dev. Best wishes, /Eugenio
-- Juan Eugenio Iglesias http://www.jeiglesias.com From: Vittorio Rispoli vit.rispoli@gmail.com Date: Tuesday, March 3, 2026 at 4:47 AM To: freesurfer@nmr.mgh.harvard.edu freesurfer@nmr.mgh.harvard.edu Subject: [Freesurfer] nextbrain segmentation tool issue
External Email - Use Caution Dear all, I successfully downloaded the atlas, but when I try to run the segmentation tool, I have the following error. Could you help me please? Best regards Vittorio
disordinimovimento2@Disordini-Movimento-2 ~ % mri_histo_atlas_segment_fireants --i/Users/disordinimovimento2/Documents/Vittorio/T1.nii.gz --o /Users/disordinimovimento2/Documents/Vittorio/prova_nextbrain --device cpu --side left --mode invivo
Running command:
fspython /Applications/freesurfer/dev/python/packages/ERC_bayesian_segmentation//scripts/segment_fireants.py --i/Users/disordinimovimento2/Documents/Vittorio/T1.nii.gz --o /Users/disordinimovimento2/Documents/Vittorio/prova_nextbrain --device cpu --side left --mode invivo --atlas_dir /Applications/freesurfer/dev/python/packages/ERC_bayesian_segmentation//atlas_simplified
Traceback (most recent call last):
File "/Applications/freesurfer/dev/python/packages/ERC_bayesian_segmentation//scripts/segment_fireants.py", line 9, in <module>
import ext.my_functions as my
File "/Applications/freesurfer/dev/python/packages/ERC_bayesian_segmentation/ext/my_functions.py", line 4, in <module>
import cv2
ModuleNotFoundError: No module named 'cv2'
disordinimovimento2@Disordini-Movimento-2 ~ %