Abstract: Disclosed herein is an earphone module having a speaker capable of reproducing both high- and low-pitched sounds. In an earphone module according to the present invention, two coils and terminal members configured to be electrically connected to the two coils are provided, the two coils and the terminal members are assembled by electrically connecting the two coils and the terminal members to each other, and then the terminal members are connected to an external input circuit through the exposure window of a housing. Accordingly, the manufacturing operation is facilitated and the defect rate is reduced, so that the mass productivity is improved.

Abstract: In accordance with one aspect of the present invention, there is provided a gaze tracking apparatus using difference image entropy, comprising: image detection module for detecting user's eye region image from image of the user taken by picture-taking apparatus which is connected to the gaze tracking apparatus; image selection module for computing entropy value of difference image between the eye region image and a plurality of reference images respectively indicating each gazing direction and selecting reference image with least difference image entropy value among the plurality of reference images; and gaze tracking module for recognizing user's gazing direction by regarding gazing direction that the selected reference image indicates as user's gazing direction.

Abstract: In accordance with one aspect of the present invention, there is provided a gaze tracking apparatus using difference image entropy, comprising: image detection module for detecting user's eye region image from image of the user taken by picture-taking apparatus which is connected to the gaze tracking apparatus; image selection module for computing entropy value of difference image between the eye region image and a plurality of reference images respectively indicating each gazing direction and selecting reference image with least difference image entropy value among the plurality of reference images; and gaze tracking module for recognizing user's gazing direction by regarding gazing direction that the selected reference image indicates as user's gazing direction.