support viewing/editing Border polygon or rectangle

[bertsky]

Page frame detection is not always trivial: textual noise from facing pages, structured background, non-orthogonal sight lines due to skew or warp – scans (or worse: photos) can offer many challenges.

But a correct Border is often necessary for downstream processing like separator detection or region segmentation.

As an annotation tool, IMO Larex should both show the annotated page frame (if any) and allow editing it manually.

[maxnth]

If I understand correctly, treating the result of the already existing RoI tool (see below) as Border and reading/writing it from/to the corresponding part in the generated PAGE XML should provide this feature (at least for border rectangles at the moment), correct?

RoI example

[bertsky]

f I understand correctly, treating the result of the already existing RoI tool (see below) as Border and reading/writing it to the corresponding part in the generated PAGE XML should provide this feature, correct?

Yes, but is the RoI tool truly polygonal (as Border in PAGE), or merely rectangular?

Also, IIUC the RoI tool is not available in edit mode (but only segment mode), right?

[maxnth]

Yes, but is the RoI tool truly polygonal (as Border in PAGE), or merely rectangular?

At the moment it's merely rectangular as well as the ignore rectangle but adding an ignore polygon shouldn't break anything, so adding this might make sense.

Also, IIUC the RoI tool is not available in edit mode (but only segment mode), right?

Yes.