Eye tracker timing performance

Eye tracking technique Hardware Software

The objective of this page is to provide a description of the different components and processes that are responsible for the timing accuracy of Tobii Eye trackers.

Eye tracker latency

Gaze data timestamp

The position of the eye is estimated based on an image taken by the sensor. The sensor is set to a fixed exposure time and the timestamp for each gaze data is set to indicate the middle of exposure time. This mid

exposure time is the best theoretical estimation of when the image was taken. The TET Server calculates the timestamp of each gaze point by taking the time of image arrival at the server (in Server Time) and subtracting it to a known
latency value that translates the time it takes for the sensor to capture the image (mid exposure value) and send it to the server. This latency is calculated according to the specifications of the sensor supplier (latency of image delivery algorithm).  

Download and read the following whitepaper to learn more about the timing accuracy of Tobii Eye Trackers

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