Abstract
In this paper, we propose the ‘in-air finger motion interface’, which solves a problem users face in interacting with mobile devices. The interface uses only a single small camera to track the three-dimensional (3D) position of the user's finger. The finger region is robustly extracted by using flashing infrared light-emitting diodes (LEDs) and by obtaining the difference image between an illuminated image and a nonilluminated image. The movement of the finger is modeled by transformation of a finger image, and its parameters are accurately estimated by iterative template matching. As a result of the evaluation, an operating area 131% larger than the size of the display and accuracy of input action of 0.6 mm in the x-direction are realized. Finally, to investigate the effect of vibration feedback, we conducted a study and found that vibration feedback significantly reduces the average time to finish the task as well as the number of input errors. © 2014 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
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