We are working with 3 precision levels for both, image annotation and video annotation:
Precision level 1 is applied when detailed, high accuracy annotation is required. The labeling is affixed with a 1-pixel (or less) spacing at this level aka pixel perfect annotation.
Precision level 2 is applied when a detailed annotation is needed, but some deviations are acceptable. It is usually used when the optimal balance between speed and quality is needed. At this level, the labelings are marked with a small gap of 2-3 pixels between the objects and the annotation boundaries.
Precision level 3 annotation involves even less precise annotations without detailed object labeling.
Please take a look at our precision level documentation slides to learn and see our annotation precision level in more detail: guide.