Objective measures Sample Clauses

Objective measures. All three Interaction Targets were equipped with uniquely identifiable markers (one on the back of the chest, one on a cap), which were tracked by an OptiTrack (▇▇▇.▇▇▇▇▇▇▇▇▇▇▇▇.▇▇▇/▇▇▇▇▇▇▇▇▇/) motion capture system using 8 infrared cameras. The robot was similarly equipped. The system used allows sub-centimeter level precision tracking of both position and orientation of each marker. We optimized tracking for the center of the interaction area, to make sure we could properly capture the interaction. Markers near the edges of the interaction area could often not be tracked. To ensure proper tracking of the actual interaction, we informed the Interaction Targets about this and asked them to not get too close to the edges of the interaction area. In the analysis here presented, we will take the marker on the cap worn by the Interaction Targets to represent their position. Speech of the Interaction Targets was recorded by equip- ping them with microphones for close talk recordings. The robot was equipped with a microphone array to record audio and a Kinect sensor. Two cameras recorded the interaction area. One camera provided a side view, the other a (fish eye) top down view. All interactions of the Visitor with the interface were recorded with screen capture software.