| Summary: | 碩士 === 國立中央大學 === 資訊工程研究所 === 99 === Due to the fast development of computer and video technologies, people are used to more humanized and convenient products. The touch screens are replacing other traditional input devices such as keyboards and mouse. Researchers have also been devoted themselves to designing new interfaces. Interfaces using webcams are one of the emerging interfaces.
This thesis presents a method to detect touches on a virtual keyboard using a single camera. We use a webcam to analyze fingertip touching actions. Firstly, we use hough transform to locate the virtual keyboard. Then, we separate the finger and the shadow to get the information such as trajectory, direction, speed and the distance between the fingertip and the shadow. Afterwards, we consider touches under two different conditions when shadow exists and shadow does not exist. We use the distance between the finger and the shadow to detect touches when shadow exists, and use the variation of trajectory and the time property to detect touches when shadow does not exist. Finally, we validate these touches by their locations and the frequency of touches.
Experimental results show that the proposed method provides a feasible way to detect touches on several kinds of the virtual keyboards with various camera distance settings. Moreover, the proposed method can be used in real-time applications.
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