Analysis of pupil size amplitude signal in field fatigue detection

In order to extract the effective fatigue detection index from the weak pupil size change, the excavator driving comparative experiment was set up. The pupil information of the experimenter was detected under the given constant light environment. Fourier transform and statistical analysis of the collected data showed that the pupil of the task group decreased significantly after operation (P < 0.05) which was regarded as fatigue state. The amplitude of pupil size oscillation was clearly displayed when the pupil signal was converted from time domain to frequency domain. While in the control group, the pupil dilation was not significantly different from that before operation (P > 0.05) and the pupil amplitude did not change significantly. Experiments show that the amplitude of pupil size oscillation is more significant in frequency domain which is conducive to the application of pupil measurement method in reality.