E T V I S I O N M A N U A L
25
The current and previous sections describe the most common use of the calibration procedure. The
system actually allows far more flexible use of the calibration function and a more complete
description is in Appendix B.
6.6
Monitor gaze data and system status
As long as the
ETVision
laptop is connected to the
ETVision
Controller with a LAN cable, or remains
within WiFi range (approximately 150 ft in absence of interference), point of gaze and eye image
feature recognition, as well as battery charge and data recording status can be monitored in real time
on the
ETVision
application. Gaze data is monitored by observing indicators superimposed on the
Left
Eye
,
Right Eye
, and
Scene Image
windows, and if desired by a plot shown on a
Data Display
window.
6.6.1
Status Indicators
Battery charge is indicated by a battery icon towards the right side of the
ETVision
tool bar. “Hover”
the mouse over the battery icon to see a battery charge percentage value. The charge values are
displayed to the nearest 5%. Similarly, an SD card icon indicates that an SD card is detected, and
when the mouse hovers over this icon, the percentage used is displayed. A symbol at the far right of
the tool bar indicates whether there is a WiFi or LAN connection to the Controller.
6.6.2
Left Eye
and
Right Eye
windows
The images from the left and right eye cameras are displayed in real time on the
Left Eye
and
Right
Eye
windows. These windows are opened by default but can be closed and re-opened by clicking the
“Eye” icon on the menu bar. Pupil recognition is indicated by a red ellipse outline to show the
detected pupil outline and a large green cross to indicate the center of the ellipse. If pupil is not being
properly recognized, the red ellipse outline will unstable or will form around the incorrect feature, and
the green cross will not be in a stable position over the pupil center.
Either eye window can be moved by dragging the title bar, can be resized by dragging a corner of the
window, or can be set to “full screen” by clicking the “maximize” symbol on the Eye window title
bar. When “maximized” the selected Eye window will show as full screen, with the other eye
window in one top corner and the Scene image window in the opposite bottom corner. Clicking
anywhere within the full screen Eye window will cause it to cover the alternate eye image and the
scene image window displays. Click the “restore” icon to return the window to normal size.
Although the eye video data is actually updating 180 times per second (and point-of-gaze is computed
and recorded 180 times per second), the
Left Eye
and
Right Eye
video displays on the laptop update at
30 Hz.
6.6.3
Scene Image
window
The image from the head mounted scene camera is displayed in real time on the
Scene Image
window.
Point-of-gaze, computed using binocular eye image data, is displayed as blue cross, superimposed on
the image. This window is opened by default but can be closed and re-opened by clicking the “Scene”