Ball annotations with CVAT

Last updated by: Basil Behanan, Last updated on: 27/09/2025

Ball annotations with CVAT

Ball annotations are slightly different to player annotations. For ball annotations, we are training a model which can predict the trajectory of the ball, but also where the ball location is even under full occlusion.

"occlusion" refers to the visibility status of an object within an image or video frame, indicating whether the object is partially or fully obstructed.

Partially occluded

If the ball is partially occluded, you mark it as occluded using the "occluded property". Partially occluded means the ball is visible, but is obstructed by something

Fully occluded

If the ball is fully occluded, mark it as occluded using the occluded property, as well as marking it as fully occluded using the checkbox in the details section.

Out of frame

If a ball it out of frame, you can toggle the "out of frame" property which removes the box annotations. When it becomes visible again, you can then toggle it again.