In this paper, a wireless and lightweight interface A-MUSE(Active emission tracking system in MUltiscreen Environment), which makes it possible to use without preventing users' illusion of immersion in large-scale VR(Virtual Reality) systems such as CAVE(CAVE Automatic Virtual Environment), is proposed. A-MUSE measures 6DOF(degrees of freedom) which are position and direction of the device. It projects five pairs of rays onto screens and then it measures 6DOF from geometrical relation between the initial and the transmitted state. It also possible to use several devices simultaneously. By using projective transformation invariants of five pairs of rays, A-MUSE makes a correspondence of rays between the initial and transmitted state. The correspondence process includes two steps. One is to detect a pair of rays projected from one device among a large number of rays. The other is to correspond each ray in the initial state to a ray in the pair of transmitted rays. The computational complexity of the process is n^5 order of the number of devices. Therefore, acceleration of the process is proposed by setting some restrictions to the process. Moreover, error reduction method is proposed for the practical use of A-MUSE in order to reduce the error occurred from several factors. It gives restriction to a matrix used for measuring of 6DOF. Finally, in order to evaluate the proposed system, A-MUSE is compared with the alternating current magnetic sensor which is usually used in CAVE. The measuring results of A-MUSE is more precise than that of magnetic sensor.
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