| 摘要 |
A system, method and apparatus for converting writing on surface to digital signal for further processing. A specially designed object which is a very cost effective passive method, helps to identify true multiple passive writing instruments writing at the same time, and can works with most passive writing instruments including human finger, pen, stick, chopstick, laser pointer and any pen a-like objects as well as regular pens. Laser pointer light beam can be identified as a writing instrument and can function similarly as a mouse function or other functions. A reflection mirrors system makes the system flexible and adjustable to work with any existing writing area at any size and can be a true portable system. An additional light sub-system enhances the captured image at am ambient light condition. A laser sub-system helps for easier installation and setup.
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