Home Forums Eye Tracking Devices et Temporal filtering

This topic contains 1 reply, has 2 voices, and was last updated by  Grant [Tobii] 3 months, 2 weeks ago.

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  • #7970

    Vasilis Andreadakis
    Participant

    Hi, I read that for Eye Tracker 4C the “Gaze data is lightly filtered, e.g. temporal filtering.”.

    Can you please explain what is the “temporal filtering” and what other filters are used to filter gaze data on 4C?

    Regards,

    #7974

    Grant [Tobii]
    Moderator

    Hi @torrero007, “Lightly filtered” (i.e. the default) is an adaptive filter which is weighted based on the age of the gaze data points GazePointData and the velocity of the eye movements. This filter is designed to remove noise and at the same time being responsive to quick eye movements, so hopefully this option should not pose an issue for your application in terms of responsiveness.

    If you are developing using the Tobii Core SDK and should you find any delay a hindrance you may select “Unfiltered” where no filtering is performed by the Interaction Engine (except for the removal of invalid data points and the averaging of the gaze points from both eyes).

    Selecting this option however is not without it’s drawback as the gaze point is an intrinsically noisy signal, as so the filters are used to stabilize the signal. There is therefore a trade-off between stability and responsiveness, so I would recommend you test out your application with both options and decide which suits you best for your own particular needs.

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