Stereoscopic focus moment identification based on pupil dynamics measures

Consumption time of stereoscopic content is increasing with the new technologies being introduced to the market, visual comfort in viewing stereoscopic images and videos is currently a subject of very high importance. Different stereoscopic viewing techniques, e.g. head mounted displays, stereoscopic monitors and projectors and large cinema screens requires individual setups for comfort image perception. The aim of the investigation, presented in this paper is to indicate measurable features of the eye activity which may correlate with visual discomfort during stereoscopic perception. In addition, a technique for focus moment identification was proposed that is based on real-time measures of eye activity. 120 stereoscopic images of publicly available dataset which had subjective evaluation of visual discomfort was shown until participants indicated they have had focused on shown stereoscopic content Pupillometric and gaze data of subjects were collected using eye tracker. Measured data shows a distinct constriction of pupil diameter, when subjects were exposed to the stereoscopic content, followed by a dilation, half of initial pupil size, until subjects indicated the time of focus. Based on these findings afore mentioned focus moment identification technique was proposed. Also, our findings of pupil dilation agrees with existing research where relationship was found between cognitive activity and pupil dilation.