9P-C-6 WebカメラによるVDT利用時の瞬目活動の計測(C会場 一般講演)

抄録

Blinking can be used as a biological indicator of consciousness, concentration power, and Visual Load. We develop a technique to obtain the number of blinking during the VDT work easily and without restrictive measurement method. In the technique, images from a generally utilized Web camera connected to PC are processed to detect the blinking. The template matching method for the image is used to track the eye region and the upper eyelid which moves up and down when blinking. In the previous paper, the accuracy of blinking detection was over 90% at the capture resolution 320^*240pixel. However, when the capture resolution was set even lower, the tracking accuracy of the upper eyelid inside the eye region deteriorated extremely. In order to improve the tracking accuracy, a new processing method is developed. The continuous change of the number of pixels which corresponds to the size of pupil and iris within the eye region is used to detect the movement of the upper eyelid. The outline of blinking waveforms is estimated by time series of the number of pixels of pupil and iris, which are counted in each single frame. The outline of blinking waveform is used for obtaining the intervals of blinks, the blink durations, and the blinking rates with high accuracies.