Abstract
Camera based multi-touch systems with an infrared
(IR) light source have been widely developed and applied to large-size
interactive electrical devices. These multi-touch systems are easy
to embed in large-sized screens because of their simple structure;
however, touch errors due to external IR noise need to be resolved
in various applications. An environment with incandescent lamps or
sun light has a higher touch error ratio than that with fluorescent
lights or LEDs because the aforementioned contain enough IR rays to
induce a signal error. To solve this problem, the frame data differential
(FDD) method was employed in a multi-touch system along with the rear
side diffuse illumination method. The FDD method removed well the
IR noise signal without any additional hardware modification to the
touch system, and the touch accuracy and sensitivity were dramatically
improved in a high IR noise environment compared with the conventional
touch sensing method.
© 2015 IEEE
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