Precision and Accuracy of Video-Based Measurements of Driver's Gaze Location

Abstract

Off-line video analysis of driver eye gaze location is becoming an increasingly important tool for automotive ergonomics research. However, little information is available through which to estimate the reliability and validity of these techniques. The current investigation assessed the accuracy and precision of subjects' judgments of driver eye gaze location from video taped records of controlled fixations across a vehicle's instrument panel. Results revealed an average accuracy for the assessment of gaze location of 8.45 cm with a corresponding precision of 12.2 cm. Accuracy, but not precision, was found to vary systematically as a function of where on the instrument panel the driver happened to be looking. These precision and accuracy values establish a benchmark which subsequent studies can use to estimate the appropriateness and limitations of the off-line video analysis technique.