1. Beyond One-dollar Mouse: A Battery-free Device for 3D Human-Computer Interaction via RFID Tags Qiongzheng Lin Lei Yang,Yuxin Sun,Tianci Liu,Xiang-Yang Li,Yunhao Liu Tsinghua University,China IIT,USA

2. Outline Motivation System Design Evaluation and Implementation Conclusion

3. Motivation

4. 1.1 Mouse In computing, a mouse is a pointing device that detects two-dimensional motion relative to a surface.

5. 1.2 3D Application 3D Human-Computer Interaction Devices

6. 1.3.1 Existing Systems Computer vision based methods Affected by Light

7. 1.3.2 Existing Systems Sensor based methods Professional Equipment

8. 1.3.3 Existing Systems Wi-Fi based methods Wi-Vi (Sigcomm’13) Inverse synthetic aperture radar (ISAR) Left and right movement trend E-eyes (MobiCom’14) Based on CSI fingerprint Tedious manual labor on Fingerprint collection Wiz (NSDI’15) Based on distance measurement FMCW Professional Equipment Body Level Action

9. 1.4 Objectives

10. System Design

11. 2.1 System Architecture

12. 2.2 Definition of Ball State Problem: Tracking the Ball State

13. 2.3 Estimating Initial Ball State

14. 2.4 Tracing Ball State

15. 2.5 Smoothing Ball State V.S. Rauch-Tung-Striebel (RTS) smoother Rauch-Tung-Striebel (RTS) smoother

16. Evaluation and Implementation

17. 3.1 System Implementation We attach 12 tags on a cube and embed the cube inside a plastic ball We employ an ImpinJ Speedway modelled R420 reader We adopt Low Level Reader Protocol (LLRP) to communicate with the reader We use LeapMotion to capture the ground truth of Rotation

18. 3.2.1 Translation Accuracy 1.5cm 0.5cm 0.7cm

19. 3.2.2 Rotation Accuracy 1.8°

20. 3.3 Effect of Parameter

24. Conclusion

25. We present an RFID-based device for human- computer interaction in 3D space Our key innovation is study on motion behaviors of a group of tags by using Extended Kalman Filter The implementation is based on purely COTS RFID productsContributions

26. Thank You!