Dikablis Eye Tracker node
The Dikablis Eye Tracker enables you to track movement of the eye's pupil to calculate the gaze vector. Its node is displayed under the Devices node when Vicon Nexus is connected to a Vicon system that includes at least one Dikablis Eye Tracker.
The Dikablis Eye Tracking system is compatible with current Vicon cameras. A minimum of two cameras are required for use with the system.
For information on setting up a Vicon system that includes Dikablis Eye Tracker, see Eye tracking with Vicon Nexus.
Dikablis Eye Tracker node context menu
The following command is available from the context menu that is displayed when you right-click on a Dikablis Eye Tracker node in the resources tree on the System tab:
Removes the Dikablis Eye Tracker node from the System resource tree.
Dikablis Eye Tracker node properties
You can configure the following settings in the Properties pane for a Dikablis Eye Tracker. For instructions on setting up the hardware, see the Dikablis Eye Tracker User Manual.
A user-defined display name for the device.
Delay Compensation (s)
The delay compensation value (in seconds).
Enter or navigate to the name of the segment that contains the eye.
Enter the same IP address that has been set in the Dikablis Recorder software.
The port number for connecting the Dikablis Recorder on the Dikablis laptop. Normally, leave this number at its default value (2002).
Eye Offset section
To find the relevant eye offset values, if your Vicon system includes video cameras, you can use overlay video. If not, you can measure the distance from the origin marker.
Enter the X-coordinate of the eye in the head segment coordinate frame (the distance between the origin marker and the eye (in mm)
Enter the Y-coordinate of the eye in the head segment coordinate frame (the distance between the origin marker and the eye (in mm)
Enter the Z-coordinate of the eye in the head segment coordinate frame (the distance between the origin marker and the eye (in mm)
Enter the name of the calibration device (normally Wand)
Clears the current calibration
Add a point to the current calibration.
Undoes the last Add operation
The number of points used in the current calibration
Estimated residual accuracy value. Calculated as the average reprojection error in eye tracker pixels.