Generalized 'Oriented Rectangle' with polygon for OpenCV:TrackerMIL

[JuliusLin]

Actions before raising this issue

• I searched the existing issues and did not find anything similar.
• I read/searched the docs

Is your feature request related to a problem? Please describe.

Currently, polygon can only perform track in interpolation style between key frames and lack of semi-auto tracking capability like 'Oriented Rectangle' used when clicking OpenCV icon from left sidebar then select Tracking:TrackerMIL. This make labeling for segmentation much difficult.
OpenCV should allow users to select number of points for polygon (or polyline), instead of restricting to (oriented) rectangle only, (oriented) rectangle is a special case of 4 points that form a rectangle, but if relax the the restriction and allow user to manually click a number of points for forming a polygon that would be perfect, because segmentation require higher precision using polygons.

Describe the solution you'd like

When click on OpenCV icon at left sidebar and select Tracking:TrackerMIL, OpenCV should allow users to select a number of points to form a polygon (or polyline), instead of restricting to (oriented) rectangle only, which is a special case of polygon.

Describe alternatives you've considered

No response

Additional context

No response

[klakhov]

Hi @JuliusLin, that could be good enhancement but I dont think we can implement it on our side.
All of the OpenCV features in CVAT rely on opencv-js (more about it here). Which is basically js bindings for c++ opencv library. The tracker feature in original opencv works only with rectangles (docs).

Maybe you can use our shapes converter feature to convert rect to polygons to edit them for more precision?