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.
The latency of an eye tracker corresponds to the interval measured from the time when an image is captured by the sensor (mid exposure) to when gaze data is outputted by the the TET Server to the network or to an eye tracking application (e.g. Tobii Pro Studio). This delay is the sum of the time taken for camera exposure,
There are two types of latencies reported in the Tobii eye tracker specifications: "processing latency" and "total system latency". The total system latency is defined as the duration from mid-point of the eye image exposure, to when a sample is available via the API on the
Processing latency describes the time required by the eye tracker processor to perform image processing and eye gaze computations. This time should not exceed the sampling interval time of the eye tracker.
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