Using the Eyelink Eye Tracker in Vizard
The Eyelink is an eye tracker made by SR Research. This article describes how to get the Eyelink working with Vizard.
1. Download and install the Eyelink Developer's kit:
https://www.sr-support.com/forums/showthread.php?t=6
To access the support site, you will first need to register at:
2. Download the win32 version of Pylink:
https://www.sr-support.com/forums/showthread.php?t=14.
Included are several Pylink modules for different versions of Python. For Vizard30 use Pylink24.
3. Download the eyelink_viz.zip file and extract the contents. Place the files inside the Pylink24 folder.
4. Run the Popup Calibration utility. The popup calibration program can be found at Start -> Programs->SR Research->EyeLink->Utilities->Popup Calibration.
Before you start the Popup Calibration, set your desired video mode. Then to calibrate, follow the instructions below.
- Start Popup Calibration.
- On Popup Calibration select file->New Session 3.
- Enter a name for the session, and click ok. (The name can be anything, the name will not be used for the recording in the Vizard script)
- Select Eyelink->Camera Setup.
- Once the camera setup is done, quit the popup calibration.
5. Run the eyelink_viz.py file. The script includes the following:
- eyelink initialization
- event handlers to startRecording, stopRecording, collectSample and closeConnection
The startRecording and stopRecording functions respond to key inputs of 'r' and 's' respectively. The collectSample function is a timer callback function called every 0.05 seconds. While recording, samples are collected from the tracker and a gaze cursor is drawn on the scene. The closeConnection function is an exit handler.
Note: Line 9 takes the size of the drawing window. So, if you are not in full screen mode, gaze values are for the windowed scene.