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Proceedings Paper

A location system based on two-dimensional position sensitive detector used in interactive projection systems
Author(s): Kai Ni; Qian Zhou; Liangjun Chen; Peng Sun; Honglei Xu; Yuan Gao; Jianshe Ma; Yi Li; Minxia Liu
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Paper Abstract

The interactive projection systems have been widely used in people's life. Currently the major type is based on interactive whiteboard (IWB). In recent years, a new type based on CCD/CMOS sensor is greatly developed. Compared to IWB, CCD/CMOS implements non-contact sensing, which can use any surface as the projection screen. This makes them more flexible in many applications. However, the main defect is that the location accuracy and tracing speed are limited by the resolution and frame rate of the CCD/CMOS. In this paper, we introduced our recent progress on constructing a new type of non-contact interactive projection system by using a two-dimensional position sensitive detector (PSD). The PSD is an analog optoelectronic position sensor utilizing photodiode surface resistance, which provides continuous position measuring and features high position resolution (better than 1.5μm) and high speed response (less than 1μs). By using the PSD, both high positioning resolution and high tracing speed can be easily achieved. A specially designed pen equipped with infrared LEDs is used as a cooperative target. A high precision signal processing system is designed and optimized. The nonlinearity of the PSD as well as the aberration of the camera lens is carefully measured and calibrated. Several anti-interference methods and algorithms are studied. Experimental results show that the positioning error is about 2mm over a 1200mm×1000mm projection screen, and the sampling rate is at least 100Hz.

Paper Details

Date Published: 10 November 2010
PDF: 7 pages
Proc. SPIE 7850, Optoelectronic Imaging and Multimedia Technology, 78502G (10 November 2010); doi: 10.1117/12.870717
Show Author Affiliations
Kai Ni, Tsinghua Univ. (China)
Qian Zhou, Tsinghua Univ. (China)
Liangjun Chen, Tsinghua Univ. (China)
Peng Sun, Tsinghua Univ. (China)
Honglei Xu, Tsinghua Univ. (China)
Yuan Gao, Tsinghua Univ. (China)
Jianshe Ma, 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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