Takashi Nagamatsu

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This paper presents a user-calibration-free method for estimating the point of gaze (POG) on a display accurately with estimation of the horizontal angles between the visual and the optical axes of both eyes. By using one pair of cameras and two light sources, the optical axis of the eye can be estimated. This estimation is carried out by using a spherical(More)
Handheld mobile devices that have a touch screen are widely used but are awkward to use with one hand. To solve this problem, we propose MobiGaze, which is a user interface that uses one's gaze (gaze interface) to operate a handheld mobile device. By using stereo cameras, the user's line of sight is detected in 3D, enabling the user to interact with a(More)
This paper presents a one-point calibration gaze tracking method based on eyeball kinematics using stereo cameras. By using two cameras and two light sources, the optic axis of the eye can be estimated. One-point calibration is required to estimate the angle of the visual axis from the optic axis. The eyeball rotates with optic and visual axes based on the(More)
A novel gaze estimation method based on a novel aspherical model of the cornea is proposed in this paper. The model is a surface of revolution about the optical axis of the eye. The calculation method is explained on the basis of the model. A prototype system for estimating the point of gaze (POG) has been developed using this method. The proposed method(More)
Nowadays, an enormous number of photographic images are uploaded on the Internet by casual users. In this study, we consider the concept of embedding geographical identification of locations as geotags in images. We attempt to retrieve images having certain similarities (or identical objects) from a geotagged image dataset. We then define the images having(More)
It is planned to install a front monitor impulse radar on the surface of the rotating drill of tunnelling machines in order to detect obstacles such as casing pipes of vertical borings. The conventional aperture synthesis technique can no more be applied to such cases because the radar image of a pipe does not constitute a hyperbola as is the case for(More)
This paper presents a method to estimate the optic and visual axes of an eye and the Point Of Gaze (POG) on the bases of Listingpsilas law using stereo cameras for three-dimensional (3D) gaze tracking. By using two cameras and two light sources, the optic axis of the eye can be estimated on the basis of a spherical model of a cornea. A one-point calibration(More)
This paper presents a calibration-free method for estimating the point of gaze (POG) on a display by using two pairs of stereo cameras. By using one pair of cameras and two light sources, the optical axis of the eye and the position of the center of the cornea can be estimated. This estimation is carried out by using a spherical model of the cornea. One(More)
A tabletop interface can enable interactions with images and real objects by using various sensors; therefore, such an interface can be applied for the creation of many artworks in the field of media arts. In this study, by focusing on gaze-and-touch interaction, we have proposed the concept of an eye-tracking tabletop interface (ETTI) as a new type of(More)