Detection of Voluntary Eye Movement for Analysis About Eye Gaze Behaviour in Virtual Communication

Abstract

In this study, we aim to realize smoother communication between avatars in virtual space and discuss the method of eye-gaze interaction used for avatar communication. It is necessary for this purpose, a specific gaze movement detection algorithm, which is necessary for measuring characteristic eye movements, blinks, and pupil movements. We developed those characteristic movement counting methods using an HMD built-in eye tracking system. Most input devices used in current virtual reality and augmented reality are hand gestures, head tracking, and voice input, despite the HMD attachment type. Therefore, in order to use the eye expression as a hands-free input modality, we consider an eye gaze input interface that does not depend on the measurement accuracy of the measurement device. Previous eye gaze interfaces have a difficulty called as “Midas touch” problem, which is the trade-off between the input speed and input errors. Therefore, using the method that has been developed so far, which as an input channel using characteristic eye movement and voluntary blinks, it aims to realize an input method that does not hinder the acquisition of other meta information alike gestures of eyes. Moreover, based on involuntary characteristic eye movements unconsciously expressed by the user, such as movement of the gaze, we discuss a system that enables “expression tactics” in the virtual space by providing natural feedback of the avatar's emotional expression and movement patterns. As a first step, we report the result of measured eyeball movements face-to-face through experiments in order to extract features of gaze and blinking.