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External Light Evasion Method for Large Multi-touch Screens

Title
External Light Evasion Method for Large Multi-touch Screens
Authors
Park, Young JinLyu, Hong-KunLee, Sang KookCho, Hui Sup
DGIST Authors
Lyu, Hong-Kun; Cho, Hui Sup
Issue Date
2014-06-23
Citation
2014 IEEE 18th International Symposium on Consumer Electronics (ISCE 2014), 226-233
Type
Conference
ISSN
2287-5255
Abstract
This paper presents an external light evasion method that rectifies the problem of misrecognition due to external lighting. The fundamental concept underlying the proposed method involves recognition of the differences between two images and elimination of the desynchronized external light by synchronizing the image sensor and inner light source of the optical touch screen. A range of artificial indoor light sources and natural sunlight are assessed. The proposed system synchronizes with a Vertical Synchronization (VSYNC) signal and the light source drive signal of the image sensor. Therefore, it can display synchronized light of the acquired image through the image sensor and remove external light that is not from the light source. A subtraction operation is used to find the differences and the absolute value of the result is utilized; hence, the order is irrelevant. The resulting image, which displays only a touched blob on the touchscreen, was created after image processing for coordination recognition and was then supplied to a coordination extraction algorithm.
URI
http://hdl.handle.net/20.500.11750/6649
DOI
10.5573/IEIESPC.2014.3.4.226
Publisher
대한전자공학회
Related Researcher
Files:
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Collection:
Intelligent Devices and Systems Research Group2. Conference Papers


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