Moved: Automatically read gazedata

[samrudhdhi]

hi,
I am using MATLAB binding. gazedata can be read using tetio_readGazeData.m function. my doubt is how can I read gazedata at the maximum speed? my ET has frame rate of 30. what does it mean? is it like maximum 30 frames/second can be read? if that so than I would like to capture all 30 frames/second.

This is a code I found from example:
for i = 1:(durationInSeconds/pauseTimeInSeconds)

pause(pauseTimeInSeconds);

[lefteye, righteye, timestamp, trigSignal] = tetio_readGazeData;

if isempty(lefteye)
continue;
end

numGazeData = size(lefteye, 2);
leftEyeAll = vertcat(leftEyeAll, lefteye(:, 1:numGazeData));
rightEyeAll = vertcat(rightEyeAll, righteye(:, 1:numGazeData));
timeStampAll = vertcat(timeStampAll, timestamp(:,1));

end

[Jenny [Tobii]]

Hi samrudhdhi,

I gather you are using the Tobii Analytics SDK with a Tobii X2-30 eye tracker? I’ll forward your question to someone responsible for the Analytics SDK.

[samrudhdhi]

Thank you much… I am really struggling to achieve the maximum accuracy possible.

[jesper högström]

frame rate is indeed the number of gaze points per second. Thus, a 30Hz eye tracker yields 30 gaze points every second.

What happens when you use the code you posted? Do you get more or fewer than 30 samples/second?

[samrudhdhi]

hi… I cant measure this correctly. there are other statements which also consume time to execute. i can only play with pause(pauseTimeInSeconds); if i keep pause(0) loop runs without errors but that exhibits some unusual behavior. is there any way by which tracker samples the gaze points at 30 samples/sec and put them automatically to a file in the background?

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