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Video Annotation - Annotating

Introduction

Video data in Flywheel eligible for annotating with CVAT is automatically prepared and synced for annotation, after which the CVAT Annotation UI can be used.

cvat_annotation_ui_rectangle_annotations.png

Instruction Steps

Launching the Annotation UI

Video files that are eligible for annotation (according to your project settings) will be ready to annotate soon after they are added to an Acquisition in your Flywheel project. The status of their readiness is denoted by an icon next to the file type column in the Web UI.

Status is Syncing

Icon Meaning
Empty The Flywheel system has not yet initiated the sync with CVAT
Syncing Flywheel has initiated the sync with CVAT, but it has not completed successfully
Synced The sync to CVAT has completed successfully, and the video file is ready to annotate
Error The sync to CVAT has failed. Verify your video file is supported

Info

If using the Flywheel SDK or API directly, the status is denoted by the file.cvat.sync_status field.

Once the file is ready to annotate, you can enter the Annotation UI by either:

  • clicking on the Launch in CVAT icon next to the green check mark
  • selecting Launch in CVAT from the file's action menu

Launch CVAT Button

Using the Annotation UI

Adding Annotations

Here are some CVAT guides to get started with their annotation UI.

CVAT Guide for Single Shape Annotation

CVAT Simple Annotation Demo

CVAT Guide for Track Mode

CVAT Tracking Annotation Demo

Saving

CVAT will auto-save any changes you have made to your annotations every 30 seconds. If you try and close the browser tab you will be prompted to save any unsaved changes.

To manually save your changes, click the Save Icon in the top control bar.

Usage Notes

  • Many keyboard shortcuts are available. Use the F1 key on your keyboard to view the available shortcuts.
  • The video playback feature may stutter to load more frame data when used with 4k or higher resolution videos, or videos with more than 10,000 frames.

Resources