Open LabScribe
Choose the settings file you wish to use with the eye tracking system. Eye Tracker Setup:- Open “External Devices” on the main menu bar.
- Enter the license information provided and set up the parameters for eye tracking and click Setup.
- Gaze Duration (msec): The amount of time, in msec, before the current time that fixation information will be displayed in the Eye Tracking window.
- Outlier Filter (msec): The amount of time, in msec, that the eye has to be fixated at a single spot. If the fixation duration is less than the Outlier Filter value, then the fixation will not be displayed in the Eye Tracking window.
- Time Offset (msec): This can be used to take care of any time offset between the eye tracking data and LabScribe data.
- Display Scaling (%): The Eye Tracker tracks the complete screen. We want to analyze LabScribe data as well as eye tracking data. Display scaling allows for the eye tracking window to show a scaled version of the screen.
- Fixation Size: The “fixation” data is shown as a circle whose radius is proportional to the fixation duration. The circle size is the radius of the circle in pixels corresponding to a 1 second fixation duration.
- Set up the Area of Interest (AOI) if there is a specific location on the image you wish the subject to focus on. Note that some experiments will just want to see where the subject is focusing rather than knowing when the subject focuses on the “designated” area.
- Choose AOI#, click the drop down to have the AOI shown as a circle or rectangle
- Open the image that the subjects will be looking at in an image editing program such as Paint, Photoshop, Lightroom
- Hover over the AOI, note the X and Y pixel coordinates – and enter these in the boxes to the right of AOI#
- When you choose to “Show the EyeTracking Window” – the image the subject is looking at will be shown on one monitor with the AOI in blue. The actual image the subject will be looking at on the second monitor will not show the AOI.
- NOTE: If you want to know when the subject looks at a specific location, you must set the AOI.
- To acquire eye tracking data, the GazePoint module has to be enabled in LabScribe and the GazePoint application has to be running.
- Calibrate the GazePoint Eye Tracking sensor.
- Choose the screen that the subject will be using. Then calibrate the Eye Tracker.
- Refer to the GazePoint manual for more instructions to calibrate the system.
- The image window in LabScribe should be moved over to a second monitor if using multiple monitors. Note that 2 monitors is preferable in this experiment especially when looking at AOI data.
Install Gazepoint Software
www.gazept.com/downloads
Password: gazepoints4u!
Download the latest Gazepoint installer file and double-click it to run. The installer will install Gazepoint Control, Gazepoint Analysis, Gazepoint API, hardware drivers, and user manuals to your computer.
Use all default settings suggested by the installer.
Connect Eye to Computer
Connect USB power and data cables to the eye tracker and connect to your computer. We recommend connecting directly to your computer and avoiding using a USB hub or switch (unless provided by Gazepoint). Note that the GP3 HD requires a USB 3.0 data port for 150Hz speed operation.
We recommend a dual-screen setup with the second monitor configured in “extended desktop mode” where possible to allow real-time observation of data collection.
Attach the supplied mini tripod to the bottom of the eye tracker and place the device as close as possible to the bottom edge of the monitor. We suggest using the Laptop Mount (optional) if using a laptop screen for eye tracking.
Note: A height-adjustable chair is recommended to allow optimal height setup for the test subject.
Positioning and Placement
Start Gazepoint Control.
Position the eye tracker below the screen, centered and as close as possible to the bottom edge. The distance between the test subject and the eye tracker should be around 65 cm (25″). The device should also be about 40 cm below eye level (15°) and pointed upwards toward the face.
Avoid excessive sunlight illuminating directly into the eye tracker or the user’s face. The eye tracker will work in low light or darkness.
If the user is wearing glasses, tilt the eye tracker towards the eyes at a steeper angle to avoid reflections.
Calibrate
In Gazepoint Control, ensure that the camera tracks the eyes correctly as indicated by green boxes around the eyes. The sliding horizontal dot should be green and mostly centered when the distance is optimal.
If using an external monitor, click on Select Screen to identify the Active Screen for the eye tracker.
Click on Calibrate and follow the white target with your eyes as it cycles through the five calibration points. Try keeping your head still and avoid blinking during calibration. Test the calibration by looking at any of the targets on the screen.
If calibration accuracy is acceptable, click on the screen or press ESC to accept calibration. If a retry is needed, press C to calibrate again.
