The Toolbox
The Video Eyetracker Toolbox is implemented as an OLE Automation Object,
built upon Microsoft's
COM technology. This results in an extremely simple
Application Programming Interface (API), which is supported by almost
all modern Windows programming systems; for example: Delphi, C++, MATLAB,
Visual Basic, even Visual
Basic for Applications (imagine your eye tracker
controlled from a Word macro!).
The Toolbox includes all the functions
needed to incorporate eye tracking into experimental software.
For example, calibration is performed by one simple call. Here is the
complete Delphi source
code, written in just seven lines, to implement a video eye tracker application
which calibrates the eye tracking engine, tracks eye position,
and displays fixation on a mimic of the subject's display. The
COM object is highly optimised for performance and is fully threaded;
this means
that on a modern PC most of the computer's CPU time is available
to service your application.
Code |
Comment |
MyEyeTracker := CoVideoEyetracker.Create; |
Initialise and create an instance of the Toolbox OLE Automation
Object |
MyEyeTracker.SetCameraScreenDimensions(8, 36, 200, 150); |
Position and display the eye image window |
MyEyeTracker.CreateCameraScreen(Self.Handle); |
|
MyEyeTracker.SetMimicScreenDimensions(216, 36, 200, 150); |
Position and display the mimic window |
MyEyeTracker.CreateMimicScreen(Self.Handle); |
|
MyEyeTracker.Calibrate(params); |
Initialise the calibration procedure
|
MyEyeTracker.StartTracking; |
Begin eyetracking and display eye position in the mimic window |
videoEyetrace
 Also included with the ToolBox is videoEyetrace, a complete eye tracking
environment, with mimic display and scrolling eye position graph.
Includes visual stimuli for saccade
and smooth pursuit experiments, plus bitmap images for reading
and visual scanning experiments.
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Video
Eyetracker Toolbox
GazeTracker