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Merge Fixations from I VT Classifier
merge_fixations_ivt R Documentation
Merge fixations classified by classify_ivt into a new, combined
fixation when they are closer to each other than the max time and max
angle distance specified.
merge_fixations_ivt(data, max_time = 75, max_angle = 0.5)
data Data frame of the eye tracking data we want to process
max_time Max time between fixations in ms
max_angle Max angle between fixations in degrees
Input data frame columns
gazeorigin_x
: X coordinates of the gaze origin
gazeorigin_y
: Y coordinates of the gaze origin
gazeorigin_z
: Z coordinates of the gaze origin
gazePoint_x
: X coordinates of the gaze point
gazePoint_y
: Y coordinates of the gaze point
gazePoint_z
: Z coordinates of the gaze point
classification
: Classification of this gaze point
eventIndex
: Index of the event in which the gaze point lies
eventType
: Type of the current event
eventDuration
: Duration of the current event
fixation_x
: X coordinate of the current fixation
fixation_y
: Y coordinate of the current fixation
fixation_z
: Z coordinate of the current fixation
This is an implementation of the merge fixation step as documented in the Tobii Pro I-VT fixation filter. It checks each gap between fixation if it is shorter than the specified max time between fixations and the angle between the fixations before and after the gap is smaller than specified. If this is the case the two fixations and the gap are merged together into a new, combined fixation.
The default values for max time and max angle are defined by Tobii to be 75 ms and 0.5 degrees.
The input data frame with the fixations merged