Heuristic filtering and reliable calibration methods for video-based pupil-tracking systems. Stampe, D., M. Behavior Research Methods, Instruments, & Computers, 1993.
Heuristic filtering and reliable calibration methods for video-based pupil-tracking systems [pdf]Paper  abstract   bibtex   
Methods for enhancing the accuracy of fixation and saccade detection and the reliability of calibration in video gaze-tracking systems are discussed. The unique aspects of the present approach include effective low-delay noise reduction prior to the detection of fixation changes, monitoring of gaze position in real time by the operator, identification of saccades as small as 0.5-degrees while eliminating false fixations, and a quick, high-precision, semiautomated calibration procedure.

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