Semantic OBB Annotation

Semantic OBB (Object bounding box) annotation interface is provided for semantically specify meaningful OBBs with up and front directions at the object and part level. Use PgUp/PgDown (Fn + Up/Down for mac keyboards) to select different labeled objects/parts.

Instructions

Click on the label of the object int the right window, the precomputed OBB will be visualized on the canvas. Following steps bellow to refine the OBB if needed.

OBB pose

  • Press J and L buttons, to reorient and refit the OBB around front and up directions. Most of the time, the precomputed OBB should look good

  • Press U, V and A buttons, to change the OBB computation method between Unrestricted, Vertical and AABB.

Front direction

  • Visualized as red arrow

  • Articulated objects: the front direction points to the side toward which the object opens

  • Rigid objects: the front direction points to a person when the person tries to interact with it

  • Press T to change the front direction vector

Up direction

  • Opposite to the gravity direction, perpendicular to the floor, and pointing to the ceiling or sky

  • If the object is tilted, the up direction tilts accordingly

  • Press P to change the up direction vector

../_images/annotation-obb.png