Get Eye Openness Data

clear;

Tobii = EyeTrackingOperations();

eyetracker_address = 'Address of the desired device';
% Example:
% eyetracker_address = 'tet-tcp://10.46.32.51';
try
    eyetracker = Tobii.get_eyetracker(eyetracker_address);
catch ME
    if (strcmp(ME.identifier,'EyeTrackerGet:error204'))
        fprintf('Unable to connect eye tracker.\n');
        return
    end
end

% The first call subscribes to the stream and returns either data
% (might be empty if no data has been received yet) or any error that
% happened during the subscription.

eyetracker.get_eye_openness_data();
pause(1);
result = eyetracker.get_eye_openness_data();

if isa(result,'StreamError')
    fprintf('Error: %s\n',string(result.Error.value));
    fprintf('Source: %s\n',string(result.Source.value));
    fprintf('SystemTimeStamp: %d\n',result.SystemTimeStamp);
    fprintf('Message: %s\n',result.Message);

elseif isa(result,'EyeOpennessData')
    % Collect data for 1 seconds.
    pause(1);

    % The subsequent calls return the current values in the stream buffer.
    % If a flat structure is prefered just use an extra input 'flat'.
    % i.e. gaze_data = eyetracker.get_eye_openness_data('flat');
    eye_openness_data = eyetracker.get_eye_openness_data();

    eyetracker.stop_eye_openness_data();
    Left_EyeOpennessStream = 0;
    Right_EyeOpennessStream = 0;
    for i = 1: size (eye_openness_data)
        Right_EyeOpennessStream(i) = eye_openness_data(i).RightEyeOpennessValue;
        Left_EyeOpennessStream(i) = eye_openness_data(i).LeftEyeOpennessValue;
    end

    fprintf('Collected %d data points\n',size(eye_openness_data,1));

    % To select the most recent data point simply select the last value of the
    % buffer.
    latest_eye_openness_data = eye_openness_data(end);

    fprintf('SystemRequestTimeStamp: %d\n',latest_eye_openness_data.SystemTimeStamp);
    fprintf('DeviceTimeStamp: %d\n',latest_eye_openness_data.DeviceTimeStamp);


    fprintf('Left eye openness value:  %.2f\n',latest_eye_openness_data.LeftEyeOpennessValue);
    fprintf('Left eye openness validity: %d\n',latest_eye_openness_data.LeftEyeValidity);

    fprintf('Right eye openness value:  %.2f\n',latest_eye_openness_data.RightEyeOpennessValue);
    fprintf('Right eye openness validity: %d\n',latest_eye_openness_data.RightEyeValidity);
end

Published with MATLAB® R2021a