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Proceedings Paper

A two-dimensional location method based on digital micromirror device used in interactive projection systems
Author(s): Liangjun Chen; Kai Ni; Qian Zhou; Xuemin Cheng; Jianshe Ma; Yuan Gao; Peng Sun; Yi Li; Minxia Liu
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Paper Abstract

Interactive projection systems based on CCD/CMOS have been greatly developed in recent years. They can locate and trace the movement of a pen equipped with an infrared LED, and displays the user's handwriting or react to the user's operation in real time. However, a major shortcoming is that the location device and the projector are independent with each other, including both the optical system and the control system. This requires construction of two optical systems, calibration of the differences between the projector view and the camera view, and also synchronization between two control systems, etc. In this paper, we introduced a two-dimensional location method based on digital micro-mirror device (DMD). The DMD is used as the display device and the position detector in turn. By serially flipping the micro-mirrors on the DMD according to a specially designed scheme and monitoring the reflected light energy, the image spot of the infrared LED can be quickly located. By using this method, the same optical system as well as the DMD can be multiplexed for projection and location, which will reduce the complexity and cost of the whole system. Furthermore, this method can also achieve high positioning accuracy and sampling rates. The results of location experiments are given.

Paper Details

Date Published: 9 November 2010
PDF: 7 pages
Proc. SPIE 7850, Optoelectronic Imaging and Multimedia Technology, 78500S (9 November 2010); doi: 10.1117/12.870655
Show Author Affiliations
Liangjun Chen, Tsinghua Univ. (China)
Kai Ni, Tsinghua Univ. (China)
Qian Zhou, Tsinghua Univ. (China)
Xuemin Cheng, Tsinghua Univ. (China)
Jianshe Ma, Tsinghua Univ. (China)
Yuan Gao, Tsinghua Univ. (China)
Peng Sun, Tsinghua Univ. (China)
Yi Li, DongGuan Univ. of Technology (China)
Minxia Liu, DongGuan Univ. of Technology (China)

Published in SPIE Proceedings Vol. 7850:
Optoelectronic Imaging and Multimedia Technology
Toru Yoshizawa; Ping Wei; Jesse Zheng; Tsutomu Shimura, Editor(s)

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