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Design of an Infrared Multi-touch Screen Controller using Stereo Vision  

Jung, Sung-Wan (Department of Electronics and Communications Engineering, Kwangwoon University)
Kwon, Oh-Jun (Department of Computer Software Engineering, Dong-Eui University)
Jeong, Yong-Jin (Department of Electronics and Communications Engineering, Kwangwoon University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.47, no.2, 2010 , pp. 68-76 More about this Journal
Abstract
Touch-enabled technology is increasingly being accepted as a main communication interface between human and computers. However, conventional touchscreen technologies, such as resistive overlay, capacitive overlay, and SAW(Surface Acoustic Wave), are not cost-effective for large screens. As an alternative to the conventional methods, we introduce a newly emerging method, an optical imaging touchscreen which is much simpler and more cost-effective. Despite its attractive benefits, optical imaging touchscreen has to overcome some problems, such as heavy computational complexity, intermittent ghost points, and over-sensitivity, to be commercially used. Therefore, we designed a hardware controller for signal processing and multi-coordinate computation, and proposed Infrared-blocked DA(Dark Area) manipulation as a solution. While the entire optical touch control took 34ms with a 32-bit microprocessor, the designed hardware controller can manage 2 valid coordinates at 200fps and also reduce energy consumption of infrared diodes from 1.8Wh to 0.0072Wh.
Keywords
Optical touch; Multi-touch; Stereo Vision; Infrared touchscreen;
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