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ROIs created by detection cannot be deleted or modified #329
Description
Summary
When a detection function (e.g., Blob detection OpenCV) creates ROIs on an
image via the "Create ROIs" option, these ROIs cannot be deleted or modified.
Any attempt to remove or change them causes the ROIs to immediately reappear.
Affected versions
- DataLab: all versions with ROI creation from detection (since the
create_roisoption was introduced)
Steps to reproduce
- Open DataLab
- Create a test image: Create > 2D Gaussian (or any image with visible features)
- Run Analysis > Blob detection (OpenCV) with the "Create ROIs" option enabled
- ROIs are created around detected blobs ✓
- Try to delete all ROIs via ROI > Delete all ROIs
- Result: the ROIs immediately reappear
The same issue occurs when trying to:
- Delete individual ROIs
- Modify ROI positions or sizes
- Invert ROI selection
Activity
StefanoPierini-Codra commentedon May 29, 2026
After
postprocess_1_to_0_resultsuccessfully creates ROIs, the parameterparam.create_roisneeds to be set toFalsein the stored object: this avoids ROI to be recreated every time, interfering with user edits.This has been fixed.
Additionally there were a bug when a ROI was moved or deleted, generating an unwanted error do to changed ROI register size: this was fixed too.
StefanoPierini-Codra commentedon May 29, 2026
Even after the fix, ROIs would still reappear when the user clicked "Delete All". This happened because the deletion triggered a re-computation using the original blob detection parameter, which automatically recreated the ROIs.
To solve this, ROI creation is now deactivated immediately after the initial blob detection. This way, if the user deletes the ROIs, they are no longer automatically recreated.
ThomasMalletCodra commentedon Jun 23, 2026
review and merged in : 9290413