voxel51/fiftyone

[FR] Rotated box CVAT integration

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#6,033 opened on Jun 19, 2025

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 (0 comments) (3 reactions) (0 assignees)Python (4,021 stars) (400 forks)batch import
featuregood first issue

Description

Proposal Summary

Support rotated box to export to CVAT. Currently, the rotated box is represented as a Polyline and converted to CVAT as a Polygon Shape. So I can't edit it there. Moreover, it can't be converted to Rectangle in CVAT

What areas of FiftyOne does this feature affect?

  • App: FiftyOne application
  • Core: Core fiftyone Python library
  • Server: FiftyOne server

Contributor guide

Tech stack
python
Domain
data
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
PythonFiftyOne basicsCVAT annotation formatrotated bounding boxes
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65
Research direction
Examine the current CVAT export code in the FiftyOne repository, likely in `fiftyone/utils/export.py` or a dedicated CVAT module. Understand how rotated boxes are currently represented as polylines and how other shapes (e.g., rectangles) are exported. Determine the correct CVAT annotation format for rotated rectangles and implement the conversion to allow editing as rectangles in CVAT. Check existing tests for export functionality and ensure the new implementation is covered.
[FR] Rotated box CVAT integration · voxel51/fiftyone#6033 | Good First Issue