Home Forums Software Development dev Change Gaze Trace Behavior?

This topic contains 5 replies, has 2 voices, and was last updated by  Grant [Tobii] 1 week, 6 days ago.

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  • #9213

    I am trying to program an App where the user is required to focus on an object on screen while tracing a line using the mouse. An error message pops up whenever the user is out of focus. Since the gaze trace is extremely sensitive, I am met with constant error message – I would like to either decrease the sensitivity of the gaze trace or increase the radius around it in the focus. Looking forward to suggestions on the same.

    #9225

    Grant [Tobii]
    Moderator

    Hi @adithideborah and thanks for your query. Could you kindly clarify what you mean by “out of focus” … you mean an error when the user is no longer tracked?

    That being the case, instead of generating an error on the first loss of tracking, you could keep a counter that will only show the error after a certain threshold amount of time has passed without tracking. Would this serve your needs? In any event, if you could be more explicit with the project description, we will do our best to help you out. Best Wishes.

    #9228

    Thank you for the response. Yes, right now I have a delay timer which throws an alert when user gaze is no longer on focus object (out of focus). I was wondering if there were other approaches. I am building an app for elderly patients to trace lines while focusing on an onscreen object/point which will be used by medical experts to correlate with disease. Right now alert messages are thrown very frequently since the object they are to focus on is smaller than the gaze trace bubble which appears on screen. Hence I was wondering if there was some way to tweak its sensitivity or radius to handle this.

    #9239

    Grant [Tobii]
    Moderator

    Hi @adithideborah, okay thanks for the clarification. The radius of the gaze trace (at rest) in fact represents the minimum area of accuracy whilst tracking which is a function of biology (small movements of gaze do not change eye position) rather than technological limitations of the tracker so is not something that can be ‘reduced’ per se. In any event, it would be beneficial to increase your stimulus size to accommodate this minimum tracking area if possible.

    #9240

    Thank you for the response. Increasing the size of the stimulus (further at this point) actually defies the purpose of the eye trials. So I was wondering if there was anything that I could do from the technological end.

    #9243

    Grant [Tobii]
    Moderator

    Hi @adithideborah no I’m afraid the gaze trace output shows the minimum tracking size and so is not subject to customisation in the manner you specified. Hopefully you can still continue with your project without too much issue. Please let us know if we can be of any further assistance.

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