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Long Range Mount Installation
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2005-2010 SR Research Ltd.
7.7.3
Align the Camera Head and Illuminator
5)
Check Host Software Configuration.
Start the EyeLink Host PC application and click
“Set Options” button. Check that the “Configuration” is set to “Long Range Mount
(Monocular)” or “Long Range Mount (Monoc/Binoc)” corresponding to how you
oriented the Camera Head (Level or Angled respectively for monocular and binocular
recording). Then navigate to the “Camera Setup” screen.
The next steps are often more easily accomplished if you have a large view of what
the camera is registering, The EyeLink 1000 API has the ability to transfer the global
view of the camera to the Display PC and all of the demo programs installed with the
EyeLink Developer’s Kit are capable of achieving this step (e.g., TRACK.EXE on
Windows or GCWindow.app on MacOS). After running one of the SR Research demo
programs, transfer the global camera image. For more details on this step, novice
users may wish to consult the tutorial of the EyeLink 1000 User Manual.
6)
Focus the Camera and Roughly Focus the Lens
. As humans do not see infrared,
monitoring the output of the infrared camera is necessary. In this step, we will shine
the Illuminator at a Target Screen (or even a wall) at the distance where the
participant’s eye(s) will eventually be and ensure that the camera’s view is centered
within the bounds of the illuminated area. The Target Screen appears at the end of
this chapter.
Start by placing the mount at the distance of the eye-to-be-tracked from the Target
Screen or a wall. With a good view of the camera’s global image on the Host or
Display PC, point the Camera Head at the Target Screen’s center (e.g., Figure 7-9).
While watching the global image, turn the lens wheel so that the image becomes
clearer – it does not have to be perfectly focused at this stage and may look
something like either image of Figure 7-9.
The following steps ensure proper illumination of whatever the camera points
at. This is done by aiming and securing the Illuminator so that the halo it
produces is in the center of the camera’s view. Because the Camera Head and
Illuminator will move together, whatever is viewed will be well-lit.
A Target Screen appears at the end of this chapter. Place the Target Screen at
the distance of the eye-to-be-tracked. It may be easiest to place the Target
Screen against a wall and to temporarily move the mount the appropriate
viewing distance for the next few steps, putting the mount into the final
location once the steps are complete.
