  This paper introduces the Event Capture Annotation Tool (ECAT), a
user-friendly, open-source interface tool for annotating events and their
participants in video, capable of extracting the 3D positions and orientations
of objects in video captured by Microsoft's Kinect(R) hardware. The modeling
language VoxML (Pustejovsky and Krishnaswamy, 2016) underlies ECAT's object,
program, and attribute representations, although ECAT uses its own spec for
explicit labeling of motion instances. The demonstration will show the tool's
workflow and the options available for capturing event-participant relations
and browsing visual data. Mapping ECAT's output to VoxML will also be
addressed.
