Home Forums Software Development Calibration quality

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    Jordi Espada

    Hi there,

    I have a Tobii Eyetracker 5L (please note that is 5L not 5) with professional license. Everything is fine with its initialization and subscribe gaze data but the calibration part is a bit confusing and there’s no calibration examples in the Stream Engine API docs,


    I would like to calibrate 5 points (4 in screen squares and one in the center) and show calibration results in the display in case it should repeat calibration or not.

    Due “Stream Engine API” only gives one point per calibrated point (that is the average of all samples collected), and doesn’t return an array of all frames per calibrated points as it does on Tobii Pro, one single point is not enough in order to present a calibration quality.

    I have seen in the API that I the gaze callback (i.e tobii_gaze_data_callback) is calling during calibration process.

    In case I take gaze data information from tobii_gaze_data_callback during the calibration process. I launch my question here,

    Is this safe to collect data gaze_point_on_display_normalized_xy from tobii_gaze_data_callback during the calibration process in order to show a calibration quality ?

    I’ll very thankful for your response

    Grant [Tobii]

    Hi @jespa007, thanks for reaching out. As you are an owner of a Tobii Tracker 5L, you are entitled to a special support channel via your sales representative.

    Please kindly reach out directly to your sales person (if you don’t know the contact, you can use the form here: https://tech.tobii.com/contact/) and inform them of your query and you will be put in touch with one of our specialist engineers.

    However, we can say that whilst it is safe to subscribe to gaze data during the calibration process further parameters are required and we would like to engage with you directly and guide you through this process. Best Wishes.

    Jordi Espada

    Hi Grant Tobii,

    Thanks to response me. I already have contacted with the Tobii sales guy. Thanks again for your response and support

    Kind regards,

    Grant [Tobii]

    Great, best of luck getting the info you need!

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