Jaehyun Han, Seongkook Heo, Geehyuk Lee

IrCube Concept

Six-degrees-of-freedom (DOF) trackers, which were mainly used for professional computer applications, are now in demand by everyday consumer applications, such as tracking player motions in an exertion computer game, tracking eyeglasses for stereoscopic displays, tracking a mobile phone in mobile spatial interaction (MSI) applications. Recently, 6-DOF tracker technologies developed for professional computer applications are being adapted for everyday consumer applications. Some examples are Sixense TrueMotion magnetic tracker, InterSense PCTracker ultrasound tracker, and PlayStation Move optical tracker. However, these solutions do not seem to satisfy the requirements of frugal consumer electronics yet. They are still too expensive to be adopted by consumer electronics. They are often too big to fit in a small device such as a tablet computer or a smartphone. They also have other limitations specific to the type of technology. Ultrasound trackers are not usually good at tracking a fast-moving object, and have limitation for miniaturization. Magnetic trackers are in a better position for miniaturization, but have the drawback of being sensitive to nearby ferromagnetic materials or external magnetic fields. Optical trackers using a camera and markers are now popular for TV game consoles. One of their drawbacks is that their tracking volume is limited by the field of view and the depth of field of a camera.

With the requirements of consumer electronics in mind, we designed an optical 6-DOF tracker where a few photo-sensors can track the position and orientation of an LED cluster. The operating principle of the tracker is basically source localization by solving an inverse problem. We implemented a prototype system for a TV viewing environment, verified the feasibility of the operating principle, and evaluated the basic performance of the prototype system in terms of accuracy and speed.

Publications

  • Seongkook Heo, Jaehyun Han, Sangwon Choi, Seunghwan Lee, Geehyuk Lee, Hyong-Euk Lee, SangHyun Kim, Won-Chul Bang, DoKyoon Kim, and ChangYeong Kim. 2011.
    IrCube tracker: an optical 6-DOF tracker based on LED directivity.
    In Proceedings of the 24th annual ACM symposium on User interface software and technology (UIST ’11). ACM, New York, NY, USA.
  • Jaehyun Han, Seongkook Heo, Geehyuk Lee, (HCI Lab @ KAIST) Won-Chul Bang, DoKyoon Kim, and ChangYeong Kim (SAIT).
    6-DOF tracker using LED directivity,
    Electronics Letters, 47(3), 177-178.

Images

Interaction Space of IrPen
Interaction Space of IrPen

IrPen Applications
IrPen Applications

IrPen Device
IrPen Device

Videos