Line-of-sight (LOS) information acquired from the eye is quite valuable in information communication technology (ICT). LOS detection systems that do not impose physical or psychological stress are strongly demanded.In this study, we fabricated and demonstrated a wearable LOS detection system that consists of micro-fabricated transparent optical sensors affixed on eyeglasses. The sensor array detects the difference in the intensity of light reflected from the pupil and the white of the eye (sclera) and then determines the view angle. The system is also equipped with a CCD camera to acquire the user's field-of-view (FOV) to deduce the LOS by using the detected view angle. This paper first presents the shapes and arrangement of the array of four cells on the eyeglasses. With only four sensor cells, we can detect the view angle in both the horizontal and vertical directions. We describe the LOS detection system and show experimentally that the error is as small as 1.5°. In addition, we deduce the characteristic output signals of the cells when the user blinks. Eye-blinking can be used as a trigger to initiate LOS measurement, select objects, etc. Finally, we successfully demonstrate the effectiveness of the proposed system to detect a user's LOS in applications that include the selection of objects to express the user's intent and tracking the point of regards to deduce the user's interest.
Our group has developed a wearable eye-tracking system that comprises transparent optical sensors on eyeglasses to detect the reflection from the eye and thus, the position of the eye, where photovoltaic cells are used as the sensors. In this paper, crosstalk, or electric interference, among the photovoltaic cells is discussed. The crosstalk makes the neighboring sensors dependent on each other, which leads to large errors in eye-tracking. We experimentally investigated the source of crosstalk by testing different designs of photovoltaic cells and their interconnection. It was revealed that sharing of the electrolyte by the photovoltaic devices was dominant. In addition, overlapping circuits were found to contribute to the crosstalk. We revised the design of the sensors and successfully reduced the crosstalk and improved the accuracy.
The line-of-sight (LOS) detection s applications, such as in the field of he human-computer interaction, and safety this paper, we demonstrate a LOS detect has micro-fabricated transparent opt eyeglasses and its applications communication technologies (ICT). We shapes and arrangement of the optical allows us to detect the view angle in bo vertical directions with only four cells. detection accuracy of 1.5 ° in the view demonstrated applications using the use by the developed system KEYWORDS Line-of-sight, Wearable, Dye-sensi device, Information communication tech
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